hack/tools/scripts/llm-key-hunter/results/_cache/content/ariangibson_understudy.json

{"repo": "ariangibson/understudy", "files": {"test/front-doors.test.ts": {"8d42a24dd9538079a422fa522e639c9df6dc6a1b": {"t": 1785746537.0720115, "n": 20929, "h": "09522e2d801eac57", "c": "import { afterEach, beforeEach, describe, expect, it, vi } from \"vitest\";\n\n/**\n * App-level tests for the Anthropic Messages and OpenAI Responses front\n * doors — the endpoints that let unmodified Claude Code and Codex sessions\n * fail over across providers. Provider HTTP is stubbed via global fetch.\n */\n\nasync function freshApp(env: Record<string, string> = {}) {\n  vi.resetModules();\n  // Neutralize upstream overrides a dev shell may have exported (e.g. after\n  // a rehearsal/ run) so provider URLs are deterministic under test.\n  vi.stubEnv(\"UNDERSTUDY_OPENAI_UPSTREAM\", \"\");\n  vi.stubEnv(\"UNDERSTUDY_ANTHROPIC_UPSTREAM\", \"\");\n  for (const [k, v] of Object.entries(env)) vi.stubEnv(k, v);\n  vi.stubEnv(\"USAGE_LOG\", `/tmp/llm-proxy-test-${Date.now()}-${Math.random()}.jsonl`);\n  const { createApp } = await import(\"../src/app.js\");\n  return createApp();\n}\n\nbeforeEach(() => {\n  vi.unstubAllEnvs();\n});\n\nafterEach(() => {\n  vi.unstubAllGlobals();\n  vi.unstubAllEnvs();\n});\n\nconst messagesBody = (model: string, extra: object = {}) =>\n  JSON.stringify({\n    model,\n    max_tokens: 1024,\n    messages: [{ role: \"user\", content: [{ type: \"text\", text: \"hi\" }] }],\n    ...extra,\n  });\n\nfunction anthropicMessage(content = \"hello from claude\") {\n  return {\n    id: \"msg_01\",\n    type: \"message\",\n    role: \"assistant\",\n    model: \"claude-sonnet-4-6\",\n    content: [{ type: \"text\", text: content }],\n    stop_reason: \"end_turn\",\n    stop_sequence: null,\n    usage: { input_tokens: 3, output_tokens: 5 },\n  };\n}\n\nfunction openaiCompletion(model: string, content = \"hello from fallback\") {\n  return {\n    id: \"chatcmpl-x\",\n    object: \"chat.completion\",\n    created: 1,\n    model,\n    choices: [\n      { index: 0, message: { role: \"assistant\", content }, finish_reason: \"stop\" },\n    ],\n    usage: { prompt_tokens: 1, completion_tokens: 2, total_tokens: 3 },\n  };\n}\n\ndescribe(\"/v1/messages — Anthropic passthrough\", () => {\n  it(\"forwards to api.anthropic.com with the server key and strips oauth betas\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.anthropic.com/v1/messages?beta=true\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers[\"x-api-key\"]).toBe(\"sk-ant-key\");\n      expect(headers.authorization).toBeUndefined();\n      expect(headers[\"anthropic-beta\"]).toBe(\"interleaved-thinking-2025-05-14\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"claude-sonnet-4-6\");\n      expect(sent.fallbacks).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/messages?beta=true\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        \"anthropic-beta\": \"oauth-2025-04-20,interleaved-thinking-2025-05-14\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\", { fallbacks: [] }),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { content: Array<{ text: string }> };\n    expect(json.content[0]?.text).toBe(\"hello from claude\");\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n  });\n\n  it(\"forwards a client OAuth token untouched, even with no server key\", async () => {\n    const app = await freshApp({ GATEWAY_API_KEYS: \"gw-secret\" }); // no ANTHROPIC_API_KEY\n    const fetchMock = vi.fn(async (_url: RequestInfo | URL, init?: RequestInit) => {\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer sk-ant-oat01-token\");\n      expect(headers[\"anthropic-beta\"]).toBe(\"oauth-2025-04-20,claude-code-20250219\");\n      expect(headers[\"x-api-key\"]).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    // Note: the OAuth bearer also passes gateway auth — it is its own credential.\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        authorization: \"Bearer sk-ant-oat01-token\",\n        \"anthropic-beta\": \"oauth-2025-04-20,claude-code-20250219\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n  });\n\n  it(\"pipes streaming SSE bytes through untouched\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const sse = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"hi\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":2}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(sse, {\n            status: 200,\n            headers: { \"content-type\": \"text/event-stream\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"content-type\")).toContain(\"text/event-stream\");\n    expect(await res.text()).toBe(sse);\n  });\n});\n\ndescribe(\"/v1/messages — cross-provider failover\", () => {\n  it(\"fails over to an OpenAI-compatible provider and answers in Anthropic shape\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const calls: string[] = [];\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n        calls.push(new URL(String(url)).hostname);\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\n            JSON.stringify({ type: \"error\", error: { type: \"rate_limit_error\", message: \"slow down\" } }),\n            { status: 429, headers: { \"retry-after\": \"30\" } },\n          );\n        }\n        // DeepSeek receives the *translated* chat-completions request.\n        const sent = JSON.parse(String(init?.body));\n        expect(sent.model).toBe(\"deepseek-chat\");\n        expect(sent.messages.at(-1)).toEqual({ role: \"user\", content: \"hi\" });\n        return new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"rescued\")), {\n          status: 200,\n          headers: { \"content-type\": \"application/json\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(calls).toEqual([\"api.anthropic.com\", \"api.deepseek.com\"]);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from anthropic/claude-sonnet-4-6\");\n\n    const json = (await res.json()) as {\n      type: string;\n      model: string;\n      content: Array<{ type: string; text: string }>;\n      stop_reason: string;\n    };\n    expect(json.type).toBe(\"message\"); // Anthropic shape, not chat.completion\n    expect(json.model).toBe(\"claude-sonnet-4-6\"); // echoes the requested model\n    expect(json.content).toEqual([{ type: \"text\", text: \"rescued\" }]);\n    expect(json.stop_reason).toBe(\"end_turn\");\n  });\n\n  it(\"re-dialects a fallback SSE stream as Anthropic events\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const openaiSSE = [\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"role\":\"assistant\",\"content\":\"res\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"cued\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{},\"finish_reason\":\"stop\"}],\"usage\":{\"prompt_tokens\":3,\"completion_tokens\":2,\"total_tokens\":5}}`,\n      \"data: [DONE]\",\n      \"\",\n    ].join(\"\\n\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\"overloaded\", { status: 529 });\n        }\n        return new Response(openaiSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    const text = await res.text();\n    expect(text).toContain(\"event: message_start\");\n    expect(text).toContain('\"text_delta\",\"text\":\"res\"');\n    expect(text).toContain('\"text_delta\",\"text\":\"cued\"');\n    expect(text).toContain('\"stop_reason\":\"end_turn\"');\n    expect(text).toContain(\"event: message_stop\");\n    // The client asked for a Claude model and must see one in message_start.\n    expect(text).toContain('\"model\":\"claude-sonnet-4-6\"');\n  });\n});\n\ndescribe(\"/v1/messages — OAuth bearer cannot reach server-key providers\", () => {\n  // An sk-ant-oat bearer clears gateway auth (it is the caller's own Anthropic\n  // credential). It must NOT become a skeleton key to the server's other\n  // provider keys — neither by requesting a non-Anthropic model directly nor\n  // by failing over onto one.\n  const OAT = \"Bearer sk-ant-oat01-fake-token\";\n\n  it(\"rejects a non-Anthropic model requested with only an OAuth bearer\", async () => {\n    const app = await freshApp({\n      GATEWAY_API_KEYS: \"gw-secret\",\n      OPENAI_API_KEY: \"sk-openai-server-key\",\n    });\n    const fetchMock = vi.fn(async () => new Response(\"{}\", { status: 200 }));\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\", authorization: OAT },\n      body: messagesBody(\"openai/gpt-5.5\"),\n    });\n\n    expect(res.status).toBe(401);\n    // The server key was never spent — no upstream call was made at all.\n    expect(fetchMock).not.toHaveBeenCalled();\n  });\n\n  it(\"does not fail an OAuth-only request over onto a server-key provider\", async () => {\n    const app = await freshApp({\n      GATEWAY_API_KEYS: \"gw-secret\",\n      OPENAI_API_KEY: \"sk-openai-server-key\",\n      FALLBACK_CHAIN: \"openai/gpt-5.5\",\n    });\n    const hosts: string[] = [];\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        hosts.push(new URL(String(url)).hostname);\n        // Anthropic (the caller's own token) is rate-limited; the only\n        // configured fallback is a server-key OpenAI route.\n        return new Response(\n          JSON.stringify({ type: \"error\", error: { type: \"rate_limit_error\", message: \"slow down\" } }),\n          { status: 429, headers: { \"retry-after\": \"30\" } },\n        );\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\", authorization: OAT },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n\n    // The Anthropic attempt is made with the caller's token and 429s, but the\n    // chain must NOT roll onto OpenAI's server key — so the client sees the\n    // upstream error, and OpenAI is never contacted.\n    expect(hosts).toEqual([\"api.anthropic.com\"]);\n    expect(hosts).not.toContain(\"api.openai.com\");\n    expect(res.status).toBe(429);\n  });\n\n  it(\"still lets a valid gateway key use other providers\", async () => {\n    const app = await freshApp({\n      GATEWAY_API_KEYS: \"gw-secret\",\n      OPENAI_API_KEY: \"sk-openai-server-key\",\n    });\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async () =>\n        new Response(JSON.stringify(openaiCompletion(\"gpt-5.5\", \"allowed\")), {\n          status: 200,\n          headers: { \"content-type\": \"application/json\" },\n        }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\", authorization: \"Bearer gw-secret\" },\n      body: messagesBody(\"openai/gpt-5.5\"),\n    });\n\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"openai\");\n  });\n});\n\ndescribe(\"/v1/responses — Codex front door\", () => {\n  const responsesBody = (model: string, extra: object = {}) =>\n    JSON.stringify({\n      model,\n      instructions: \"You are Codex.\",\n      input: [\n        {\n          type: \"message\",\n          role: \"user\",\n          content: [{ type: \"input_text\", text: \"hi\" }],\n        },\n      ],\n      tools: [],\n      tool_choice: \"auto\",\n      store: false,\n      stream: false,\n      ...extra,\n    });\n\n  it(\"translates to chat completions and back to a Responses object\", async () => {\n    const app = await freshApp({ OPENAI_API_KEY: \"sk-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.openai.com/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.messages[0]).toEqual({ role: \"system\", content: \"You are Codex.\" });\n      expect(sent.messages[1]).toEqual({ role: \"user\", content: \"hi\" });\n      return new Response(JSON.stringify(openaiCompletion(\"gpt-5-mini\", \"hi there\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as {\n      object: string;\n      status: string;\n      output: Array<{ type: string; content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.status).toBe(\"completed\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"hi there\");\n  });\n\n  it(\"serves Codex from a chat-completions-only host (synthetic.new)\", async () => {\n    const app = await freshApp({ SYNTHETIC_API_KEY: \"syn-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.synthetic.new/openai/v1/chat/completions\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer syn-test\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"syn:large:vision\");\n      return new Response(\n        JSON.stringify(openaiCompletion(\"syn:large:vision\", \"open model here\")),\n        { status: 200, headers: { \"content-type\": \"application/json\" } },\n      );\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"syn:large:vision\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"synthetic\");\n    const json = (await res.json()) as {\n      object: string;\n      output: Array<{ content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"open model here\");\n  });\n\n  it(\"streams Responses events and fails over across providers\", async () => {\n    const app = await freshApp({\n      OPENAI_API_KEY: \"sk-test\",\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      FALLBACK_CHAIN: \"anthropic/claude-sonnet-4-6\",\n    });\n    const anthropicSSE = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_start`,\n      `data: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"claude to the rescue\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":4}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"openai.com\")) {\n          return new Response(JSON.stringify({ error: { message: \"rate limited\" } }), {\n            status: 429,\n          });\n        }\n        expect(String(url)).toContain(\"api.anthropic.com/v1/messages\");\n        return new Response(anthropicSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from openai/gpt-5-mini\");\n\n    const text = await res.text();\n    expect(text).toContain(\"event: response.created\");\n    expect(text).toContain(\"event: response.output_text.delta\");\n    expect(text).toContain('\"delta\":\"claude to the rescue\"');\n    expect(text).toContain(\"event: response.completed\");\n  });\n});\n\ndescribe(\"MODEL_OVERRIDES\", () => {\n  it(\"rewrites the requested model before routing\", async () => {\n    const app = await freshApp({\n      GROQ_API_KEY: \"gk-test\",\n      MODEL_OVERRIDES: \"claude-3-5-haiku*=groq/llama-3.3-70b\",\n    });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.groq.com/openai/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"llama-3.3-70b\");\n      return new Response(JSON.stringify(openaiCompletion(\"llama-3.3-70b\", \"overridden\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/chat/completions\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: JSON.stringify({\n        model: \"claude-3-5-haiku-20241022\",\n        messages: [{ role: \"user\", content: \"hi\" }],\n      }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"groq\");\n  });\n\n  it(\"applies on the Messages front door too, answering in Anthropic shape\", async () => {\n    const app = await freshApp({\n      DEEPSEEK_API_KEY: \"dk-test\",\n      MODEL_OVERRIDES: \"claude-*=deepseek/deepseek-chat\",\n    });\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"ds answer\")), {\n            status: 200,\n            headers: { \"content-type\": \"application/json\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    const json = (await res.json()) as { type: string; content: Array<{ text: string }> };\n    expect(json.type).toBe(\"message\");\n    expect(json.content[0]?.text).toBe(\"ds answer\");\n  });\n});\n\ndescribe(\"/v1/messages/count_tokens\", () => {\n  it(\"estimates locally when no upstream key is configured\", async () => {\n    const app = await freshApp();\n    const res = await app.request(\"/v1/messages/count_tokens\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { input_tokens: number };\n    expect(json.input_tokens).toBeGreaterThan(0);\n  });\n});\n"}, "bc4ce7c85a1a44964d7fb956c5f2dbcd811e8e43": {"t": 1785765438.1845603, "n": 20929, "h": "09522e2d801eac57", "c": "import { afterEach, beforeEach, describe, expect, it, vi } from \"vitest\";\n\n/**\n * App-level tests for the Anthropic Messages and OpenAI Responses front\n * doors — the endpoints that let unmodified Claude Code and Codex sessions\n * fail over across providers. Provider HTTP is stubbed via global fetch.\n */\n\nasync function freshApp(env: Record<string, string> = {}) {\n  vi.resetModules();\n  // Neutralize upstream overrides a dev shell may have exported (e.g. after\n  // a rehearsal/ run) so provider URLs are deterministic under test.\n  vi.stubEnv(\"UNDERSTUDY_OPENAI_UPSTREAM\", \"\");\n  vi.stubEnv(\"UNDERSTUDY_ANTHROPIC_UPSTREAM\", \"\");\n  for (const [k, v] of Object.entries(env)) vi.stubEnv(k, v);\n  vi.stubEnv(\"USAGE_LOG\", `/tmp/llm-proxy-test-${Date.now()}-${Math.random()}.jsonl`);\n  const { createApp } = await import(\"../src/app.js\");\n  return createApp();\n}\n\nbeforeEach(() => {\n  vi.unstubAllEnvs();\n});\n\nafterEach(() => {\n  vi.unstubAllGlobals();\n  vi.unstubAllEnvs();\n});\n\nconst messagesBody = (model: string, extra: object = {}) =>\n  JSON.stringify({\n    model,\n    max_tokens: 1024,\n    messages: [{ role: \"user\", content: [{ type: \"text\", text: \"hi\" }] }],\n    ...extra,\n  });\n\nfunction anthropicMessage(content = \"hello from claude\") {\n  return {\n    id: \"msg_01\",\n    type: \"message\",\n    role: \"assistant\",\n    model: \"claude-sonnet-4-6\",\n    content: [{ type: \"text\", text: content }],\n    stop_reason: \"end_turn\",\n    stop_sequence: null,\n    usage: { input_tokens: 3, output_tokens: 5 },\n  };\n}\n\nfunction openaiCompletion(model: string, content = \"hello from fallback\") {\n  return {\n    id: \"chatcmpl-x\",\n    object: \"chat.completion\",\n    created: 1,\n    model,\n    choices: [\n      { index: 0, message: { role: \"assistant\", content }, finish_reason: \"stop\" },\n    ],\n    usage: { prompt_tokens: 1, completion_tokens: 2, total_tokens: 3 },\n  };\n}\n\ndescribe(\"/v1/messages — Anthropic passthrough\", () => {\n  it(\"forwards to api.anthropic.com with the server key and strips oauth betas\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.anthropic.com/v1/messages?beta=true\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers[\"x-api-key\"]).toBe(\"sk-ant-key\");\n      expect(headers.authorization).toBeUndefined();\n      expect(headers[\"anthropic-beta\"]).toBe(\"interleaved-thinking-2025-05-14\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"claude-sonnet-4-6\");\n      expect(sent.fallbacks).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/messages?beta=true\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        \"anthropic-beta\": \"oauth-2025-04-20,interleaved-thinking-2025-05-14\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\", { fallbacks: [] }),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { content: Array<{ text: string }> };\n    expect(json.content[0]?.text).toBe(\"hello from claude\");\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n  });\n\n  it(\"forwards a client OAuth token untouched, even with no server key\", async () => {\n    const app = await freshApp({ GATEWAY_API_KEYS: \"gw-secret\" }); // no ANTHROPIC_API_KEY\n    const fetchMock = vi.fn(async (_url: RequestInfo | URL, init?: RequestInit) => {\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer sk-ant-oat01-token\");\n      expect(headers[\"anthropic-beta\"]).toBe(\"oauth-2025-04-20,claude-code-20250219\");\n      expect(headers[\"x-api-key\"]).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    // Note: the OAuth bearer also passes gateway auth — it is its own credential.\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        authorization: \"Bearer sk-ant-oat01-token\",\n        \"anthropic-beta\": \"oauth-2025-04-20,claude-code-20250219\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n  });\n\n  it(\"pipes streaming SSE bytes through untouched\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const sse = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"hi\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":2}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(sse, {\n            status: 200,\n            headers: { \"content-type\": \"text/event-stream\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"content-type\")).toContain(\"text/event-stream\");\n    expect(await res.text()).toBe(sse);\n  });\n});\n\ndescribe(\"/v1/messages — cross-provider failover\", () => {\n  it(\"fails over to an OpenAI-compatible provider and answers in Anthropic shape\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const calls: string[] = [];\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n        calls.push(new URL(String(url)).hostname);\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\n            JSON.stringify({ type: \"error\", error: { type: \"rate_limit_error\", message: \"slow down\" } }),\n            { status: 429, headers: { \"retry-after\": \"30\" } },\n          );\n        }\n        // DeepSeek receives the *translated* chat-completions request.\n        const sent = JSON.parse(String(init?.body));\n        expect(sent.model).toBe(\"deepseek-chat\");\n        expect(sent.messages.at(-1)).toEqual({ role: \"user\", content: \"hi\" });\n        return new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"rescued\")), {\n          status: 200,\n          headers: { \"content-type\": \"application/json\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(calls).toEqual([\"api.anthropic.com\", \"api.deepseek.com\"]);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from anthropic/claude-sonnet-4-6\");\n\n    const json = (await res.json()) as {\n      type: string;\n      model: string;\n      content: Array<{ type: string; text: string }>;\n      stop_reason: string;\n    };\n    expect(json.type).toBe(\"message\"); // Anthropic shape, not chat.completion\n    expect(json.model).toBe(\"claude-sonnet-4-6\"); // echoes the requested model\n    expect(json.content).toEqual([{ type: \"text\", text: \"rescued\" }]);\n    expect(json.stop_reason).toBe(\"end_turn\");\n  });\n\n  it(\"re-dialects a fallback SSE stream as Anthropic events\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const openaiSSE = [\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"role\":\"assistant\",\"content\":\"res\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"cued\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{},\"finish_reason\":\"stop\"}],\"usage\":{\"prompt_tokens\":3,\"completion_tokens\":2,\"total_tokens\":5}}`,\n      \"data: [DONE]\",\n      \"\",\n    ].join(\"\\n\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\"overloaded\", { status: 529 });\n        }\n        return new Response(openaiSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    const text = await res.text();\n    expect(text).toContain(\"event: message_start\");\n    expect(text).toContain('\"text_delta\",\"text\":\"res\"');\n    expect(text).toContain('\"text_delta\",\"text\":\"cued\"');\n    expect(text).toContain('\"stop_reason\":\"end_turn\"');\n    expect(text).toContain(\"event: message_stop\");\n    // The client asked for a Claude model and must see one in message_start.\n    expect(text).toContain('\"model\":\"claude-sonnet-4-6\"');\n  });\n});\n\ndescribe(\"/v1/messages — OAuth bearer cannot reach server-key providers\", () => {\n  // An sk-ant-oat bearer clears gateway auth (it is the caller's own Anthropic\n  // credential). It must NOT become a skeleton key to the server's other\n  // provider keys — neither by requesting a non-Anthropic model directly nor\n  // by failing over onto one.\n  const OAT = \"Bearer sk-ant-oat01-fake-token\";\n\n  it(\"rejects a non-Anthropic model requested with only an OAuth bearer\", async () => {\n    const app = await freshApp({\n      GATEWAY_API_KEYS: \"gw-secret\",\n      OPENAI_API_KEY: \"sk-openai-server-key\",\n    });\n    const fetchMock = vi.fn(async () => new Response(\"{}\", { status: 200 }));\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\", authorization: OAT },\n      body: messagesBody(\"openai/gpt-5.5\"),\n    });\n\n    expect(res.status).toBe(401);\n    // The server key was never spent — no upstream call was made at all.\n    expect(fetchMock).not.toHaveBeenCalled();\n  });\n\n  it(\"does not fail an OAuth-only request over onto a server-key provider\", async () => {\n    const app = await freshApp({\n      GATEWAY_API_KEYS: \"gw-secret\",\n      OPENAI_API_KEY: \"sk-openai-server-key\",\n      FALLBACK_CHAIN: \"openai/gpt-5.5\",\n    });\n    const hosts: string[] = [];\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        hosts.push(new URL(String(url)).hostname);\n        // Anthropic (the caller's own token) is rate-limited; the only\n        // configured fallback is a server-key OpenAI route.\n        return new Response(\n          JSON.stringify({ type: \"error\", error: { type: \"rate_limit_error\", message: \"slow down\" } }),\n          { status: 429, headers: { \"retry-after\": \"30\" } },\n        );\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\", authorization: OAT },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n\n    // The Anthropic attempt is made with the caller's token and 429s, but the\n    // chain must NOT roll onto OpenAI's server key — so the client sees the\n    // upstream error, and OpenAI is never contacted.\n    expect(hosts).toEqual([\"api.anthropic.com\"]);\n    expect(hosts).not.toContain(\"api.openai.com\");\n    expect(res.status).toBe(429);\n  });\n\n  it(\"still lets a valid gateway key use other providers\", async () => {\n    const app = await freshApp({\n      GATEWAY_API_KEYS: \"gw-secret\",\n      OPENAI_API_KEY: \"sk-openai-server-key\",\n    });\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async () =>\n        new Response(JSON.stringify(openaiCompletion(\"gpt-5.5\", \"allowed\")), {\n          status: 200,\n          headers: { \"content-type\": \"application/json\" },\n        }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\", authorization: \"Bearer gw-secret\" },\n      body: messagesBody(\"openai/gpt-5.5\"),\n    });\n\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"openai\");\n  });\n});\n\ndescribe(\"/v1/responses — Codex front door\", () => {\n  const responsesBody = (model: string, extra: object = {}) =>\n    JSON.stringify({\n      model,\n      instructions: \"You are Codex.\",\n      input: [\n        {\n          type: \"message\",\n          role: \"user\",\n          content: [{ type: \"input_text\", text: \"hi\" }],\n        },\n      ],\n      tools: [],\n      tool_choice: \"auto\",\n      store: false,\n      stream: false,\n      ...extra,\n    });\n\n  it(\"translates to chat completions and back to a Responses object\", async () => {\n    const app = await freshApp({ OPENAI_API_KEY: \"sk-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.openai.com/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.messages[0]).toEqual({ role: \"system\", content: \"You are Codex.\" });\n      expect(sent.messages[1]).toEqual({ role: \"user\", content: \"hi\" });\n      return new Response(JSON.stringify(openaiCompletion(\"gpt-5-mini\", \"hi there\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as {\n      object: string;\n      status: string;\n      output: Array<{ type: string; content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.status).toBe(\"completed\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"hi there\");\n  });\n\n  it(\"serves Codex from a chat-completions-only host (synthetic.new)\", async () => {\n    const app = await freshApp({ SYNTHETIC_API_KEY: \"syn-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.synthetic.new/openai/v1/chat/completions\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer syn-test\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"syn:large:vision\");\n      return new Response(\n        JSON.stringify(openaiCompletion(\"syn:large:vision\", \"open model here\")),\n        { status: 200, headers: { \"content-type\": \"application/json\" } },\n      );\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"syn:large:vision\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"synthetic\");\n    const json = (await res.json()) as {\n      object: string;\n      output: Array<{ content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"open model here\");\n  });\n\n  it(\"streams Responses events and fails over across providers\", async () => {\n    const app = await freshApp({\n      OPENAI_API_KEY: \"sk-test\",\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      FALLBACK_CHAIN: \"anthropic/claude-sonnet-4-6\",\n    });\n    const anthropicSSE = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_start`,\n      `data: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"claude to the rescue\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":4}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"openai.com\")) {\n          return new Response(JSON.stringify({ error: { message: \"rate limited\" } }), {\n            status: 429,\n          });\n        }\n        expect(String(url)).toContain(\"api.anthropic.com/v1/messages\");\n        return new Response(anthropicSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from openai/gpt-5-mini\");\n\n    const text = await res.text();\n    expect(text).toContain(\"event: response.created\");\n    expect(text).toContain(\"event: response.output_text.delta\");\n    expect(text).toContain('\"delta\":\"claude to the rescue\"');\n    expect(text).toContain(\"event: response.completed\");\n  });\n});\n\ndescribe(\"MODEL_OVERRIDES\", () => {\n  it(\"rewrites the requested model before routing\", async () => {\n    const app = await freshApp({\n      GROQ_API_KEY: \"gk-test\",\n      MODEL_OVERRIDES: \"claude-3-5-haiku*=groq/llama-3.3-70b\",\n    });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.groq.com/openai/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"llama-3.3-70b\");\n      return new Response(JSON.stringify(openaiCompletion(\"llama-3.3-70b\", \"overridden\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/chat/completions\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: JSON.stringify({\n        model: \"claude-3-5-haiku-20241022\",\n        messages: [{ role: \"user\", content: \"hi\" }],\n      }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"groq\");\n  });\n\n  it(\"applies on the Messages front door too, answering in Anthropic shape\", async () => {\n    const app = await freshApp({\n      DEEPSEEK_API_KEY: \"dk-test\",\n      MODEL_OVERRIDES: \"claude-*=deepseek/deepseek-chat\",\n    });\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"ds answer\")), {\n            status: 200,\n            headers: { \"content-type\": \"application/json\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    const json = (await res.json()) as { type: string; content: Array<{ text: string }> };\n    expect(json.type).toBe(\"message\");\n    expect(json.content[0]?.text).toBe(\"ds answer\");\n  });\n});\n\ndescribe(\"/v1/messages/count_tokens\", () => {\n  it(\"estimates locally when no upstream key is configured\", async () => {\n    const app = await freshApp();\n    const res = await app.request(\"/v1/messages/count_tokens\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { input_tokens: number };\n    expect(json.input_tokens).toBeGreaterThan(0);\n  });\n});\n"}, "8b955380f23a542a0ac3c61c3bdedbabeaf3ce22": {"t": 1785765439.6191978, "n": 17734, "h": "91a03d522cfd9e8c", "c": "import { afterEach, beforeEach, describe, expect, it, vi } from \"vitest\";\n\n/**\n * App-level tests for the Anthropic Messages and OpenAI Responses front\n * doors — the endpoints that let unmodified Claude Code and Codex sessions\n * fail over across providers. Provider HTTP is stubbed via global fetch.\n */\n\nasync function freshApp(env: Record<string, string> = {}) {\n  vi.resetModules();\n  // Neutralize upstream overrides a dev shell may have exported (e.g. after\n  // a rehearsal/ run) so provider URLs are deterministic under test.\n  vi.stubEnv(\"UNDERSTUDY_OPENAI_UPSTREAM\", \"\");\n  vi.stubEnv(\"UNDERSTUDY_ANTHROPIC_UPSTREAM\", \"\");\n  for (const [k, v] of Object.entries(env)) vi.stubEnv(k, v);\n  vi.stubEnv(\"USAGE_LOG\", `/tmp/llm-proxy-test-${Date.now()}-${Math.random()}.jsonl`);\n  const { createApp } = await import(\"../src/app.js\");\n  return createApp();\n}\n\nbeforeEach(() => {\n  vi.unstubAllEnvs();\n});\n\nafterEach(() => {\n  vi.unstubAllGlobals();\n  vi.unstubAllEnvs();\n});\n\nconst messagesBody = (model: string, extra: object = {}) =>\n  JSON.stringify({\n    model,\n    max_tokens: 1024,\n    messages: [{ role: \"user\", content: [{ type: \"text\", text: \"hi\" }] }],\n    ...extra,\n  });\n\nfunction anthropicMessage(content = \"hello from claude\") {\n  return {\n    id: \"msg_01\",\n    type: \"message\",\n    role: \"assistant\",\n    model: \"claude-sonnet-4-6\",\n    content: [{ type: \"text\", text: content }],\n    stop_reason: \"end_turn\",\n    stop_sequence: null,\n    usage: { input_tokens: 3, output_tokens: 5 },\n  };\n}\n\nfunction openaiCompletion(model: string, content = \"hello from fallback\") {\n  return {\n    id: \"chatcmpl-x\",\n    object: \"chat.completion\",\n    created: 1,\n    model,\n    choices: [\n      { index: 0, message: { role: \"assistant\", content }, finish_reason: \"stop\" },\n    ],\n    usage: { prompt_tokens: 1, completion_tokens: 2, total_tokens: 3 },\n  };\n}\n\ndescribe(\"/v1/messages — Anthropic passthrough\", () => {\n  it(\"forwards to api.anthropic.com with the server key and strips oauth betas\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.anthropic.com/v1/messages?beta=true\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers[\"x-api-key\"]).toBe(\"sk-ant-key\");\n      expect(headers.authorization).toBeUndefined();\n      expect(headers[\"anthropic-beta\"]).toBe(\"interleaved-thinking-2025-05-14\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"claude-sonnet-4-6\");\n      expect(sent.fallbacks).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/messages?beta=true\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        \"anthropic-beta\": \"oauth-2025-04-20,interleaved-thinking-2025-05-14\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\", { fallbacks: [] }),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { content: Array<{ text: string }> };\n    expect(json.content[0]?.text).toBe(\"hello from claude\");\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n  });\n\n  it(\"forwards a client OAuth token untouched, even with no server key\", async () => {\n    const app = await freshApp({ GATEWAY_API_KEYS: \"gw-secret\" }); // no ANTHROPIC_API_KEY\n    const fetchMock = vi.fn(async (_url: RequestInfo | URL, init?: RequestInit) => {\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer sk-ant-oat01-token\");\n      expect(headers[\"anthropic-beta\"]).toBe(\"oauth-2025-04-20,claude-code-20250219\");\n      expect(headers[\"x-api-key\"]).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    // Note: the OAuth bearer also passes gateway auth — it is its own credential.\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        authorization: \"Bearer sk-ant-oat01-token\",\n        \"anthropic-beta\": \"oauth-2025-04-20,claude-code-20250219\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n  });\n\n  it(\"pipes streaming SSE bytes through untouched\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const sse = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"hi\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":2}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(sse, {\n            status: 200,\n            headers: { \"content-type\": \"text/event-stream\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"content-type\")).toContain(\"text/event-stream\");\n    expect(await res.text()).toBe(sse);\n  });\n});\n\ndescribe(\"/v1/messages — cross-provider failover\", () => {\n  it(\"fails over to an OpenAI-compatible provider and answers in Anthropic shape\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const calls: string[] = [];\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n        calls.push(new URL(String(url)).hostname);\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\n            JSON.stringify({ type: \"error\", error: { type: \"rate_limit_error\", message: \"slow down\" } }),\n            { status: 429, headers: { \"retry-after\": \"30\" } },\n          );\n        }\n        // DeepSeek receives the *translated* chat-completions request.\n        const sent = JSON.parse(String(init?.body));\n        expect(sent.model).toBe(\"deepseek-chat\");\n        expect(sent.messages.at(-1)).toEqual({ role: \"user\", content: \"hi\" });\n        return new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"rescued\")), {\n          status: 200,\n          headers: { \"content-type\": \"application/json\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(calls).toEqual([\"api.anthropic.com\", \"api.deepseek.com\"]);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from anthropic/claude-sonnet-4-6\");\n\n    const json = (await res.json()) as {\n      type: string;\n      model: string;\n      content: Array<{ type: string; text: string }>;\n      stop_reason: string;\n    };\n    expect(json.type).toBe(\"message\"); // Anthropic shape, not chat.completion\n    expect(json.model).toBe(\"claude-sonnet-4-6\"); // echoes the requested model\n    expect(json.content).toEqual([{ type: \"text\", text: \"rescued\" }]);\n    expect(json.stop_reason).toBe(\"end_turn\");\n  });\n\n  it(\"re-dialects a fallback SSE stream as Anthropic events\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const openaiSSE = [\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"role\":\"assistant\",\"content\":\"res\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"cued\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{},\"finish_reason\":\"stop\"}],\"usage\":{\"prompt_tokens\":3,\"completion_tokens\":2,\"total_tokens\":5}}`,\n      \"data: [DONE]\",\n      \"\",\n    ].join(\"\\n\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\"overloaded\", { status: 529 });\n        }\n        return new Response(openaiSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    const text = await res.text();\n    expect(text).toContain(\"event: message_start\");\n    expect(text).toContain('\"text_delta\",\"text\":\"res\"');\n    expect(text).toContain('\"text_delta\",\"text\":\"cued\"');\n    expect(text).toContain('\"stop_reason\":\"end_turn\"');\n    expect(text).toContain(\"event: message_stop\");\n    // The client asked for a Claude model and must see one in message_start.\n    expect(text).toContain('\"model\":\"claude-sonnet-4-6\"');\n  });\n});\n\ndescribe(\"/v1/responses — Codex front door\", () => {\n  const responsesBody = (model: string, extra: object = {}) =>\n    JSON.stringify({\n      model,\n      instructions: \"You are Codex.\",\n      input: [\n        {\n          type: \"message\",\n          role: \"user\",\n          content: [{ type: \"input_text\", text: \"hi\" }],\n        },\n      ],\n      tools: [],\n      tool_choice: \"auto\",\n      store: false,\n      stream: false,\n      ...extra,\n    });\n\n  it(\"translates to chat completions and back to a Responses object\", async () => {\n    const app = await freshApp({ OPENAI_API_KEY: \"sk-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.openai.com/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.messages[0]).toEqual({ role: \"system\", content: \"You are Codex.\" });\n      expect(sent.messages[1]).toEqual({ role: \"user\", content: \"hi\" });\n      return new Response(JSON.stringify(openaiCompletion(\"gpt-5-mini\", \"hi there\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as {\n      object: string;\n      status: string;\n      output: Array<{ type: string; content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.status).toBe(\"completed\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"hi there\");\n  });\n\n  it(\"serves Codex from a chat-completions-only host (synthetic.new)\", async () => {\n    const app = await freshApp({ SYNTHETIC_API_KEY: \"syn-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.synthetic.new/openai/v1/chat/completions\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer syn-test\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"syn:large:vision\");\n      return new Response(\n        JSON.stringify(openaiCompletion(\"syn:large:vision\", \"open model here\")),\n        { status: 200, headers: { \"content-type\": \"application/json\" } },\n      );\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"syn:large:vision\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"synthetic\");\n    const json = (await res.json()) as {\n      object: string;\n      output: Array<{ content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"open model here\");\n  });\n\n  it(\"streams Responses events and fails over across providers\", async () => {\n    const app = await freshApp({\n      OPENAI_API_KEY: \"sk-test\",\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      FALLBACK_CHAIN: \"anthropic/claude-sonnet-4-6\",\n    });\n    const anthropicSSE = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_start`,\n      `data: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"claude to the rescue\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":4}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"openai.com\")) {\n          return new Response(JSON.stringify({ error: { message: \"rate limited\" } }), {\n            status: 429,\n          });\n        }\n        expect(String(url)).toContain(\"api.anthropic.com/v1/messages\");\n        return new Response(anthropicSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from openai/gpt-5-mini\");\n\n    const text = await res.text();\n    expect(text).toContain(\"event: response.created\");\n    expect(text).toContain(\"event: response.output_text.delta\");\n    expect(text).toContain('\"delta\":\"claude to the rescue\"');\n    expect(text).toContain(\"event: response.completed\");\n  });\n});\n\ndescribe(\"MODEL_OVERRIDES\", () => {\n  it(\"rewrites the requested model before routing\", async () => {\n    const app = await freshApp({\n      GROQ_API_KEY: \"gk-test\",\n      MODEL_OVERRIDES: \"claude-3-5-haiku*=groq/llama-3.3-70b\",\n    });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.groq.com/openai/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"llama-3.3-70b\");\n      return new Response(JSON.stringify(openaiCompletion(\"llama-3.3-70b\", \"overridden\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/chat/completions\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: JSON.stringify({\n        model: \"claude-3-5-haiku-20241022\",\n        messages: [{ role: \"user\", content: \"hi\" }],\n      }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"groq\");\n  });\n\n  it(\"applies on the Messages front door too, answering in Anthropic shape\", async () => {\n    const app = await freshApp({\n      DEEPSEEK_API_KEY: \"dk-test\",\n      MODEL_OVERRIDES: \"claude-*=deepseek/deepseek-chat\",\n    });\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"ds answer\")), {\n            status: 200,\n            headers: { \"content-type\": \"application/json\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    const json = (await res.json()) as { type: string; content: Array<{ text: string }> };\n    expect(json.type).toBe(\"message\");\n    expect(json.content[0]?.text).toBe(\"ds answer\");\n  });\n});\n\ndescribe(\"/v1/messages/count_tokens\", () => {\n  it(\"estimates locally when no upstream key is configured\", async () => {\n    const app = await freshApp();\n    const res = await app.request(\"/v1/messages/count_tokens\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { input_tokens: number };\n    expect(json.input_tokens).toBeGreaterThan(0);\n  });\n});\n"}, "c20c27b01d29a4d60f477128a02708b0d2ce4420": {"t": 1785765441.193825, "n": 17488, "h": "9d66ba6c48f5a8c9", "c": "import { afterEach, beforeEach, describe, expect, it, vi } from \"vitest\";\n\n/**\n * App-level tests for the Anthropic Messages and OpenAI Responses front\n * doors — the endpoints that let unmodified Claude Code and Codex sessions\n * fail over across providers. Provider HTTP is stubbed via global fetch.\n */\n\nasync function freshApp(env: Record<string, string> = {}) {\n  vi.resetModules();\n  for (const [k, v] of Object.entries(env)) vi.stubEnv(k, v);\n  vi.stubEnv(\"USAGE_LOG\", `/tmp/llm-proxy-test-${Date.now()}-${Math.random()}.jsonl`);\n  const { createApp } = await import(\"../src/app.js\");\n  return createApp();\n}\n\nbeforeEach(() => {\n  vi.unstubAllEnvs();\n});\n\nafterEach(() => {\n  vi.unstubAllGlobals();\n  vi.unstubAllEnvs();\n});\n\nconst messagesBody = (model: string, extra: object = {}) =>\n  JSON.stringify({\n    model,\n    max_tokens: 1024,\n    messages: [{ role: \"user\", content: [{ type: \"text\", text: \"hi\" }] }],\n    ...extra,\n  });\n\nfunction anthropicMessage(content = \"hello from claude\") {\n  return {\n    id: \"msg_01\",\n    type: \"message\",\n    role: \"assistant\",\n    model: \"claude-sonnet-4-6\",\n    content: [{ type: \"text\", text: content }],\n    stop_reason: \"end_turn\",\n    stop_sequence: null,\n    usage: { input_tokens: 3, output_tokens: 5 },\n  };\n}\n\nfunction openaiCompletion(model: string, content = \"hello from fallback\") {\n  return {\n    id: \"chatcmpl-x\",\n    object: \"chat.completion\",\n    created: 1,\n    model,\n    choices: [\n      { index: 0, message: { role: \"assistant\", content }, finish_reason: \"stop\" },\n    ],\n    usage: { prompt_tokens: 1, completion_tokens: 2, total_tokens: 3 },\n  };\n}\n\ndescribe(\"/v1/messages — Anthropic passthrough\", () => {\n  it(\"forwards to api.anthropic.com with the server key and strips oauth betas\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.anthropic.com/v1/messages?beta=true\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers[\"x-api-key\"]).toBe(\"sk-ant-key\");\n      expect(headers.authorization).toBeUndefined();\n      expect(headers[\"anthropic-beta\"]).toBe(\"interleaved-thinking-2025-05-14\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"claude-sonnet-4-6\");\n      expect(sent.fallbacks).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/messages?beta=true\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        \"anthropic-beta\": \"oauth-2025-04-20,interleaved-thinking-2025-05-14\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\", { fallbacks: [] }),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { content: Array<{ text: string }> };\n    expect(json.content[0]?.text).toBe(\"hello from claude\");\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n  });\n\n  it(\"forwards a client OAuth token untouched, even with no server key\", async () => {\n    const app = await freshApp({ GATEWAY_API_KEYS: \"gw-secret\" }); // no ANTHROPIC_API_KEY\n    const fetchMock = vi.fn(async (_url: RequestInfo | URL, init?: RequestInit) => {\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer sk-ant-oat01-token\");\n      expect(headers[\"anthropic-beta\"]).toBe(\"oauth-2025-04-20,claude-code-20250219\");\n      expect(headers[\"x-api-key\"]).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    // Note: the OAuth bearer also passes gateway auth — it is its own credential.\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        authorization: \"Bearer sk-ant-oat01-token\",\n        \"anthropic-beta\": \"oauth-2025-04-20,claude-code-20250219\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n  });\n\n  it(\"pipes streaming SSE bytes through untouched\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const sse = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"hi\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":2}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(sse, {\n            status: 200,\n            headers: { \"content-type\": \"text/event-stream\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"content-type\")).toContain(\"text/event-stream\");\n    expect(await res.text()).toBe(sse);\n  });\n});\n\ndescribe(\"/v1/messages — cross-provider failover\", () => {\n  it(\"fails over to an OpenAI-compatible provider and answers in Anthropic shape\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const calls: string[] = [];\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n        calls.push(new URL(String(url)).hostname);\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\n            JSON.stringify({ type: \"error\", error: { type: \"rate_limit_error\", message: \"slow down\" } }),\n            { status: 429, headers: { \"retry-after\": \"30\" } },\n          );\n        }\n        // DeepSeek receives the *translated* chat-completions request.\n        const sent = JSON.parse(String(init?.body));\n        expect(sent.model).toBe(\"deepseek-chat\");\n        expect(sent.messages.at(-1)).toEqual({ role: \"user\", content: \"hi\" });\n        return new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"rescued\")), {\n          status: 200,\n          headers: { \"content-type\": \"application/json\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(calls).toEqual([\"api.anthropic.com\", \"api.deepseek.com\"]);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from anthropic/claude-sonnet-4-6\");\n\n    const json = (await res.json()) as {\n      type: string;\n      model: string;\n      content: Array<{ type: string; text: string }>;\n      stop_reason: string;\n    };\n    expect(json.type).toBe(\"message\"); // Anthropic shape, not chat.completion\n    expect(json.model).toBe(\"claude-sonnet-4-6\"); // echoes the requested model\n    expect(json.content).toEqual([{ type: \"text\", text: \"rescued\" }]);\n    expect(json.stop_reason).toBe(\"end_turn\");\n  });\n\n  it(\"re-dialects a fallback SSE stream as Anthropic events\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const openaiSSE = [\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"role\":\"assistant\",\"content\":\"res\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"cued\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{},\"finish_reason\":\"stop\"}],\"usage\":{\"prompt_tokens\":3,\"completion_tokens\":2,\"total_tokens\":5}}`,\n      \"data: [DONE]\",\n      \"\",\n    ].join(\"\\n\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\"overloaded\", { status: 529 });\n        }\n        return new Response(openaiSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    const text = await res.text();\n    expect(text).toContain(\"event: message_start\");\n    expect(text).toContain('\"text_delta\",\"text\":\"res\"');\n    expect(text).toContain('\"text_delta\",\"text\":\"cued\"');\n    expect(text).toContain('\"stop_reason\":\"end_turn\"');\n    expect(text).toContain(\"event: message_stop\");\n    // The client asked for a Claude model and must see one in message_start.\n    expect(text).toContain('\"model\":\"claude-sonnet-4-6\"');\n  });\n});\n\ndescribe(\"/v1/responses — Codex front door\", () => {\n  const responsesBody = (model: string, extra: object = {}) =>\n    JSON.stringify({\n      model,\n      instructions: \"You are Codex.\",\n      input: [\n        {\n          type: \"message\",\n          role: \"user\",\n          content: [{ type: \"input_text\", text: \"hi\" }],\n        },\n      ],\n      tools: [],\n      tool_choice: \"auto\",\n      store: false,\n      stream: false,\n      ...extra,\n    });\n\n  it(\"translates to chat completions and back to a Responses object\", async () => {\n    const app = await freshApp({ OPENAI_API_KEY: \"sk-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.openai.com/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.messages[0]).toEqual({ role: \"system\", content: \"You are Codex.\" });\n      expect(sent.messages[1]).toEqual({ role: \"user\", content: \"hi\" });\n      return new Response(JSON.stringify(openaiCompletion(\"gpt-5-mini\", \"hi there\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as {\n      object: string;\n      status: string;\n      output: Array<{ type: string; content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.status).toBe(\"completed\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"hi there\");\n  });\n\n  it(\"serves Codex from a chat-completions-only host (synthetic.new)\", async () => {\n    const app = await freshApp({ SYNTHETIC_API_KEY: \"syn-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.synthetic.new/openai/v1/chat/completions\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer syn-test\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"syn:large:vision\");\n      return new Response(\n        JSON.stringify(openaiCompletion(\"syn:large:vision\", \"open model here\")),\n        { status: 200, headers: { \"content-type\": \"application/json\" } },\n      );\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"syn:large:vision\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"synthetic\");\n    const json = (await res.json()) as {\n      object: string;\n      output: Array<{ content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"open model here\");\n  });\n\n  it(\"streams Responses events and fails over across providers\", async () => {\n    const app = await freshApp({\n      OPENAI_API_KEY: \"sk-test\",\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      FALLBACK_CHAIN: \"anthropic/claude-sonnet-4-6\",\n    });\n    const anthropicSSE = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_start`,\n      `data: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"claude to the rescue\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":4}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"openai.com\")) {\n          return new Response(JSON.stringify({ error: { message: \"rate limited\" } }), {\n            status: 429,\n          });\n        }\n        expect(String(url)).toContain(\"api.anthropic.com/v1/messages\");\n        return new Response(anthropicSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from openai/gpt-5-mini\");\n\n    const text = await res.text();\n    expect(text).toContain(\"event: response.created\");\n    expect(text).toContain(\"event: response.output_text.delta\");\n    expect(text).toContain('\"delta\":\"claude to the rescue\"');\n    expect(text).toContain(\"event: response.completed\");\n  });\n});\n\ndescribe(\"MODEL_OVERRIDES\", () => {\n  it(\"rewrites the requested model before routing\", async () => {\n    const app = await freshApp({\n      GROQ_API_KEY: \"gk-test\",\n      MODEL_OVERRIDES: \"claude-3-5-haiku*=groq/llama-3.3-70b\",\n    });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.groq.com/openai/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"llama-3.3-70b\");\n      return new Response(JSON.stringify(openaiCompletion(\"llama-3.3-70b\", \"overridden\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/chat/completions\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: JSON.stringify({\n        model: \"claude-3-5-haiku-20241022\",\n        messages: [{ role: \"user\", content: \"hi\" }],\n      }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"groq\");\n  });\n\n  it(\"applies on the Messages front door too, answering in Anthropic shape\", async () => {\n    const app = await freshApp({\n      DEEPSEEK_API_KEY: \"dk-test\",\n      MODEL_OVERRIDES: \"claude-*=deepseek/deepseek-chat\",\n    });\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"ds answer\")), {\n            status: 200,\n            headers: { \"content-type\": \"application/json\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    const json = (await res.json()) as { type: string; content: Array<{ text: string }> };\n    expect(json.type).toBe(\"message\");\n    expect(json.content[0]?.text).toBe(\"ds answer\");\n  });\n});\n\ndescribe(\"/v1/messages/count_tokens\", () => {\n  it(\"estimates locally when no upstream key is configured\", async () => {\n    const app = await freshApp();\n    const res = await app.request(\"/v1/messages/count_tokens\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { input_tokens: number };\n    expect(json.input_tokens).toBeGreaterThan(0);\n  });\n});\n"}, "9f41854cdc156fe4f8afca3c114d5beaf888a47e": {"t": 1785765442.7125475, "n": 17497, "h": "3af8663e58229482", "c": "import { afterEach, beforeEach, describe, expect, it, vi } from \"vitest\";\n\n/**\n * App-level tests for the Anthropic Messages and OpenAI Responses front\n * doors — the endpoints that let unmodified Claude Code and Codex sessions\n * fail over across providers. Provider HTTP is stubbed via global fetch.\n */\n\nasync function freshApp(env: Record<string, string> = {}) {\n  vi.resetModules();\n  for (const [k, v] of Object.entries(env)) vi.stubEnv(k, v);\n  vi.stubEnv(\"USAGE_LOG\", `/tmp/llm-proxy-test-${Date.now()}-${Math.random()}.jsonl`);\n  const { createApp } = await import(\"../src/app.js\");\n  return createApp();\n}\n\nbeforeEach(() => {\n  vi.unstubAllEnvs();\n});\n\nafterEach(() => {\n  vi.unstubAllGlobals();\n  vi.unstubAllEnvs();\n});\n\nconst messagesBody = (model: string, extra: object = {}) =>\n  JSON.stringify({\n    model,\n    max_tokens: 1024,\n    messages: [{ role: \"user\", content: [{ type: \"text\", text: \"hi\" }] }],\n    ...extra,\n  });\n\nfunction anthropicMessage(content = \"hello from claude\") {\n  return {\n    id: \"msg_01\",\n    type: \"message\",\n    role: \"assistant\",\n    model: \"claude-sonnet-4-6\",\n    content: [{ type: \"text\", text: content }],\n    stop_reason: \"end_turn\",\n    stop_sequence: null,\n    usage: { input_tokens: 3, output_tokens: 5 },\n  };\n}\n\nfunction openaiCompletion(model: string, content = \"hello from fallback\") {\n  return {\n    id: \"chatcmpl-x\",\n    object: \"chat.completion\",\n    created: 1,\n    model,\n    choices: [\n      { index: 0, message: { role: \"assistant\", content }, finish_reason: \"stop\" },\n    ],\n    usage: { prompt_tokens: 1, completion_tokens: 2, total_tokens: 3 },\n  };\n}\n\ndescribe(\"/v1/messages — Anthropic passthrough\", () => {\n  it(\"forwards to api.anthropic.com with the server key and strips oauth betas\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.anthropic.com/v1/messages?beta=true\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers[\"x-api-key\"]).toBe(\"sk-ant-key\");\n      expect(headers.authorization).toBeUndefined();\n      expect(headers[\"anthropic-beta\"]).toBe(\"interleaved-thinking-2025-05-14\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"claude-sonnet-4-6\");\n      expect(sent.fallbacks).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/messages?beta=true\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        \"anthropic-beta\": \"oauth-2025-04-20,interleaved-thinking-2025-05-14\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\", { fallbacks: [] }),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { content: Array<{ text: string }> };\n    expect(json.content[0]?.text).toBe(\"hello from claude\");\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n  });\n\n  it(\"forwards a client OAuth token untouched, even with no server key\", async () => {\n    const app = await freshApp({ GATEWAY_API_KEYS: \"gw-secret\" }); // no ANTHROPIC_API_KEY\n    const fetchMock = vi.fn(async (_url: RequestInfo | URL, init?: RequestInit) => {\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer sk-ant-oat01-token\");\n      expect(headers[\"anthropic-beta\"]).toBe(\"oauth-2025-04-20,claude-code-20250219\");\n      expect(headers[\"x-api-key\"]).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    // Note: the OAuth bearer also passes gateway auth — it is its own credential.\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        authorization: \"Bearer sk-ant-oat01-token\",\n        \"anthropic-beta\": \"oauth-2025-04-20,claude-code-20250219\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n  });\n\n  it(\"pipes streaming SSE bytes through untouched\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const sse = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"hi\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":2}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(sse, {\n            status: 200,\n            headers: { \"content-type\": \"text/event-stream\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"content-type\")).toContain(\"text/event-stream\");\n    expect(await res.text()).toBe(sse);\n  });\n});\n\ndescribe(\"/v1/messages — cross-provider failover\", () => {\n  it(\"fails over to an OpenAI-compatible provider and answers in Anthropic shape\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const calls: string[] = [];\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n        calls.push(new URL(String(url)).hostname);\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\n            JSON.stringify({ type: \"error\", error: { type: \"rate_limit_error\", message: \"slow down\" } }),\n            { status: 429, headers: { \"retry-after\": \"30\" } },\n          );\n        }\n        // DeepSeek receives the *translated* chat-completions request.\n        const sent = JSON.parse(String(init?.body));\n        expect(sent.model).toBe(\"deepseek-chat\");\n        expect(sent.messages.at(-1)).toEqual({ role: \"user\", content: \"hi\" });\n        return new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"rescued\")), {\n          status: 200,\n          headers: { \"content-type\": \"application/json\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(calls).toEqual([\"api.anthropic.com\", \"api.deepseek.com\"]);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from anthropic/claude-sonnet-4-6\");\n\n    const json = (await res.json()) as {\n      type: string;\n      model: string;\n      content: Array<{ type: string; text: string }>;\n      stop_reason: string;\n    };\n    expect(json.type).toBe(\"message\"); // Anthropic shape, not chat.completion\n    expect(json.model).toBe(\"claude-sonnet-4-6\"); // echoes the requested model\n    expect(json.content).toEqual([{ type: \"text\", text: \"rescued\" }]);\n    expect(json.stop_reason).toBe(\"end_turn\");\n  });\n\n  it(\"re-dialects a fallback SSE stream as Anthropic events\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const openaiSSE = [\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"role\":\"assistant\",\"content\":\"res\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"cued\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{},\"finish_reason\":\"stop\"}],\"usage\":{\"prompt_tokens\":3,\"completion_tokens\":2,\"total_tokens\":5}}`,\n      \"data: [DONE]\",\n      \"\",\n    ].join(\"\\n\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\"overloaded\", { status: 529 });\n        }\n        return new Response(openaiSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    const text = await res.text();\n    expect(text).toContain(\"event: message_start\");\n    expect(text).toContain('\"text_delta\",\"text\":\"res\"');\n    expect(text).toContain('\"text_delta\",\"text\":\"cued\"');\n    expect(text).toContain('\"stop_reason\":\"end_turn\"');\n    expect(text).toContain(\"event: message_stop\");\n    // The client asked for a Claude model and must see one in message_start.\n    expect(text).toContain('\"model\":\"claude-sonnet-4-6\"');\n  });\n});\n\ndescribe(\"/v1/responses — Codex front door\", () => {\n  const responsesBody = (model: string, extra: object = {}) =>\n    JSON.stringify({\n      model,\n      instructions: \"You are Codex.\",\n      input: [\n        {\n          type: \"message\",\n          role: \"user\",\n          content: [{ type: \"input_text\", text: \"hi\" }],\n        },\n      ],\n      tools: [],\n      tool_choice: \"auto\",\n      store: false,\n      stream: false,\n      ...extra,\n    });\n\n  it(\"translates to chat completions and back to a Responses object\", async () => {\n    const app = await freshApp({ OPENAI_API_KEY: \"sk-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.openai.com/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.messages[0]).toEqual({ role: \"system\", content: \"You are Codex.\" });\n      expect(sent.messages[1]).toEqual({ role: \"user\", content: \"hi\" });\n      return new Response(JSON.stringify(openaiCompletion(\"gpt-5-mini\", \"hi there\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as {\n      object: string;\n      status: string;\n      output: Array<{ type: string; content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.status).toBe(\"completed\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"hi there\");\n  });\n\n  it(\"serves Codex from a chat-completions-only host (synthetic.new)\", async () => {\n    const app = await freshApp({ SYNTHETIC_API_KEY: \"syn-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.synthetic.new/openai/v1/chat/completions\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer syn-test\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"hf:moonshotai/Kimi-K2.6\");\n      return new Response(\n        JSON.stringify(openaiCompletion(\"hf:moonshotai/Kimi-K2.6\", \"kimi here\")),\n        { status: 200, headers: { \"content-type\": \"application/json\" } },\n      );\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"hf:moonshotai/Kimi-K2.6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"synthetic\");\n    const json = (await res.json()) as {\n      object: string;\n      output: Array<{ content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"kimi here\");\n  });\n\n  it(\"streams Responses events and fails over across providers\", async () => {\n    const app = await freshApp({\n      OPENAI_API_KEY: \"sk-test\",\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      FALLBACK_CHAIN: \"anthropic/claude-sonnet-4-6\",\n    });\n    const anthropicSSE = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_start`,\n      `data: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"claude to the rescue\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":4}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"openai.com\")) {\n          return new Response(JSON.stringify({ error: { message: \"rate limited\" } }), {\n            status: 429,\n          });\n        }\n        expect(String(url)).toContain(\"api.anthropic.com/v1/messages\");\n        return new Response(anthropicSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from openai/gpt-5-mini\");\n\n    const text = await res.text();\n    expect(text).toContain(\"event: response.created\");\n    expect(text).toContain(\"event: response.output_text.delta\");\n    expect(text).toContain('\"delta\":\"claude to the rescue\"');\n    expect(text).toContain(\"event: response.completed\");\n  });\n});\n\ndescribe(\"MODEL_OVERRIDES\", () => {\n  it(\"rewrites the requested model before routing\", async () => {\n    const app = await freshApp({\n      GROQ_API_KEY: \"gk-test\",\n      MODEL_OVERRIDES: \"claude-3-5-haiku*=groq/llama-3.3-70b\",\n    });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.groq.com/openai/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"llama-3.3-70b\");\n      return new Response(JSON.stringify(openaiCompletion(\"llama-3.3-70b\", \"overridden\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/chat/completions\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: JSON.stringify({\n        model: \"claude-3-5-haiku-20241022\",\n        messages: [{ role: \"user\", content: \"hi\" }],\n      }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"groq\");\n  });\n\n  it(\"applies on the Messages front door too, answering in Anthropic shape\", async () => {\n    const app = await freshApp({\n      DEEPSEEK_API_KEY: \"dk-test\",\n      MODEL_OVERRIDES: \"claude-*=deepseek/deepseek-chat\",\n    });\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"ds answer\")), {\n            status: 200,\n            headers: { \"content-type\": \"application/json\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    const json = (await res.json()) as { type: string; content: Array<{ text: string }> };\n    expect(json.type).toBe(\"message\");\n    expect(json.content[0]?.text).toBe(\"ds answer\");\n  });\n});\n\ndescribe(\"/v1/messages/count_tokens\", () => {\n  it(\"estimates locally when no upstream key is configured\", async () => {\n    const app = await freshApp();\n    const res = await app.request(\"/v1/messages/count_tokens\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { input_tokens: number };\n    expect(json.input_tokens).toBeGreaterThan(0);\n  });\n});\n"}, "14a9627f3baf2485db176d35d1ce17d04de90014": {"t": 1785765444.070743, "n": 16160, "h": "0a962cdd3c965233", "c": "import { afterEach, beforeEach, describe, expect, it, vi } from \"vitest\";\n\n/**\n * App-level tests for the Anthropic Messages and OpenAI Responses front\n * doors — the endpoints that let unmodified Claude Code and Codex sessions\n * fail over across providers. Provider HTTP is stubbed via global fetch.\n */\n\nasync function freshApp(env: Record<string, string> = {}) {\n  vi.resetModules();\n  for (const [k, v] of Object.entries(env)) vi.stubEnv(k, v);\n  vi.stubEnv(\"USAGE_LOG\", `/tmp/llm-proxy-test-${Date.now()}-${Math.random()}.jsonl`);\n  const { createApp } = await import(\"../src/app.js\");\n  return createApp();\n}\n\nbeforeEach(() => {\n  vi.unstubAllEnvs();\n});\n\nafterEach(() => {\n  vi.unstubAllGlobals();\n  vi.unstubAllEnvs();\n});\n\nconst messagesBody = (model: string, extra: object = {}) =>\n  JSON.stringify({\n    model,\n    max_tokens: 1024,\n    messages: [{ role: \"user\", content: [{ type: \"text\", text: \"hi\" }] }],\n    ...extra,\n  });\n\nfunction anthropicMessage(content = \"hello from claude\") {\n  return {\n    id: \"msg_01\",\n    type: \"message\",\n    role: \"assistant\",\n    model: \"claude-sonnet-4-6\",\n    content: [{ type: \"text\", text: content }],\n    stop_reason: \"end_turn\",\n    stop_sequence: null,\n    usage: { input_tokens: 3, output_tokens: 5 },\n  };\n}\n\nfunction openaiCompletion(model: string, content = \"hello from fallback\") {\n  return {\n    id: \"chatcmpl-x\",\n    object: \"chat.completion\",\n    created: 1,\n    model,\n    choices: [\n      { index: 0, message: { role: \"assistant\", content }, finish_reason: \"stop\" },\n    ],\n    usage: { prompt_tokens: 1, completion_tokens: 2, total_tokens: 3 },\n  };\n}\n\ndescribe(\"/v1/messages — Anthropic passthrough\", () => {\n  it(\"forwards to api.anthropic.com with the server key and strips oauth betas\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.anthropic.com/v1/messages?beta=true\");\n      const headers = init?.headers as Record<string, string>;\n      expect(headers[\"x-api-key\"]).toBe(\"sk-ant-key\");\n      expect(headers.authorization).toBeUndefined();\n      expect(headers[\"anthropic-beta\"]).toBe(\"interleaved-thinking-2025-05-14\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"claude-sonnet-4-6\");\n      expect(sent.fallbacks).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/messages?beta=true\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        \"anthropic-beta\": \"oauth-2025-04-20,interleaved-thinking-2025-05-14\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\", { fallbacks: [] }),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { content: Array<{ text: string }> };\n    expect(json.content[0]?.text).toBe(\"hello from claude\");\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n  });\n\n  it(\"forwards a client OAuth token untouched, even with no server key\", async () => {\n    const app = await freshApp({ GATEWAY_API_KEYS: \"gw-secret\" }); // no ANTHROPIC_API_KEY\n    const fetchMock = vi.fn(async (_url: RequestInfo | URL, init?: RequestInit) => {\n      const headers = init?.headers as Record<string, string>;\n      expect(headers.authorization).toBe(\"Bearer sk-ant-oat01-token\");\n      expect(headers[\"anthropic-beta\"]).toBe(\"oauth-2025-04-20,claude-code-20250219\");\n      expect(headers[\"x-api-key\"]).toBeUndefined();\n      return new Response(JSON.stringify(anthropicMessage()), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    // Note: the OAuth bearer also passes gateway auth — it is its own credential.\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: {\n        \"content-type\": \"application/json\",\n        authorization: \"Bearer sk-ant-oat01-token\",\n        \"anthropic-beta\": \"oauth-2025-04-20,claude-code-20250219\",\n      },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n  });\n\n  it(\"pipes streaming SSE bytes through untouched\", async () => {\n    const app = await freshApp({ ANTHROPIC_API_KEY: \"sk-ant-key\" });\n    const sse = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"hi\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":2}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(sse, {\n            status: 200,\n            headers: { \"content-type\": \"text/event-stream\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"content-type\")).toContain(\"text/event-stream\");\n    expect(await res.text()).toBe(sse);\n  });\n});\n\ndescribe(\"/v1/messages — cross-provider failover\", () => {\n  it(\"fails over to an OpenAI-compatible provider and answers in Anthropic shape\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const calls: string[] = [];\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n        calls.push(new URL(String(url)).hostname);\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\n            JSON.stringify({ type: \"error\", error: { type: \"rate_limit_error\", message: \"slow down\" } }),\n            { status: 429, headers: { \"retry-after\": \"30\" } },\n          );\n        }\n        // DeepSeek receives the *translated* chat-completions request.\n        const sent = JSON.parse(String(init?.body));\n        expect(sent.model).toBe(\"deepseek-chat\");\n        expect(sent.messages.at(-1)).toEqual({ role: \"user\", content: \"hi\" });\n        return new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"rescued\")), {\n          status: 200,\n          headers: { \"content-type\": \"application/json\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(calls).toEqual([\"api.anthropic.com\", \"api.deepseek.com\"]);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from anthropic/claude-sonnet-4-6\");\n\n    const json = (await res.json()) as {\n      type: string;\n      model: string;\n      content: Array<{ type: string; text: string }>;\n      stop_reason: string;\n    };\n    expect(json.type).toBe(\"message\"); // Anthropic shape, not chat.completion\n    expect(json.model).toBe(\"claude-sonnet-4-6\"); // echoes the requested model\n    expect(json.content).toEqual([{ type: \"text\", text: \"rescued\" }]);\n    expect(json.stop_reason).toBe(\"end_turn\");\n  });\n\n  it(\"re-dialects a fallback SSE stream as Anthropic events\", async () => {\n    const app = await freshApp({\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      DEEPSEEK_API_KEY: \"dk-test\",\n      FALLBACK_CHAIN: \"deepseek/deepseek-chat\",\n    });\n    const openaiSSE = [\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"role\":\"assistant\",\"content\":\"res\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"cued\"},\"finish_reason\":null}]}`,\n      `data: {\"id\":\"c\",\"object\":\"chat.completion.chunk\",\"created\":1,\"model\":\"deepseek-chat\",\"choices\":[{\"index\":0,\"delta\":{},\"finish_reason\":\"stop\"}],\"usage\":{\"prompt_tokens\":3,\"completion_tokens\":2,\"total_tokens\":5}}`,\n      \"data: [DONE]\",\n      \"\",\n    ].join(\"\\n\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"anthropic.com\")) {\n          return new Response(\"overloaded\", { status: 529 });\n        }\n        return new Response(openaiSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    const text = await res.text();\n    expect(text).toContain(\"event: message_start\");\n    expect(text).toContain('\"text_delta\",\"text\":\"res\"');\n    expect(text).toContain('\"text_delta\",\"text\":\"cued\"');\n    expect(text).toContain('\"stop_reason\":\"end_turn\"');\n    expect(text).toContain(\"event: message_stop\");\n    // The client asked for a Claude model and must see one in message_start.\n    expect(text).toContain('\"model\":\"claude-sonnet-4-6\"');\n  });\n});\n\ndescribe(\"/v1/responses — Codex front door\", () => {\n  const responsesBody = (model: string, extra: object = {}) =>\n    JSON.stringify({\n      model,\n      instructions: \"You are Codex.\",\n      input: [\n        {\n          type: \"message\",\n          role: \"user\",\n          content: [{ type: \"input_text\", text: \"hi\" }],\n        },\n      ],\n      tools: [],\n      tool_choice: \"auto\",\n      store: false,\n      stream: false,\n      ...extra,\n    });\n\n  it(\"translates to chat completions and back to a Responses object\", async () => {\n    const app = await freshApp({ OPENAI_API_KEY: \"sk-test\" });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.openai.com/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.messages[0]).toEqual({ role: \"system\", content: \"You are Codex.\" });\n      expect(sent.messages[1]).toEqual({ role: \"user\", content: \"hi\" });\n      return new Response(JSON.stringify(openaiCompletion(\"gpt-5-mini\", \"hi there\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as {\n      object: string;\n      status: string;\n      output: Array<{ type: string; content: Array<{ text: string }> }>;\n    };\n    expect(json.object).toBe(\"response\");\n    expect(json.status).toBe(\"completed\");\n    expect(json.output[0]?.content[0]?.text).toBe(\"hi there\");\n  });\n\n  it(\"streams Responses events and fails over across providers\", async () => {\n    const app = await freshApp({\n      OPENAI_API_KEY: \"sk-test\",\n      ANTHROPIC_API_KEY: \"sk-ant-key\",\n      FALLBACK_CHAIN: \"anthropic/claude-sonnet-4-6\",\n    });\n    const anthropicSSE = [\n      `event: message_start`,\n      `data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_01\",\"usage\":{\"input_tokens\":3}}}`,\n      ``,\n      `event: content_block_start`,\n      `data: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}`,\n      ``,\n      `event: content_block_delta`,\n      `data: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"claude to the rescue\"}}`,\n      ``,\n      `event: message_delta`,\n      `data: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":4}}`,\n      ``,\n      `event: message_stop`,\n      `data: {\"type\":\"message_stop\"}`,\n      ``,\n      ``,\n    ].join(\"\\n\");\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(async (url: RequestInfo | URL) => {\n        if (String(url).includes(\"openai.com\")) {\n          return new Response(JSON.stringify({ error: { message: \"rate limited\" } }), {\n            status: 429,\n          });\n        }\n        expect(String(url)).toContain(\"api.anthropic.com/v1/messages\");\n        return new Response(anthropicSSE, {\n          status: 200,\n          headers: { \"content-type\": \"text/event-stream\" },\n        });\n      }),\n    );\n\n    const res = await app.request(\"/v1/responses\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: responsesBody(\"gpt-5-mini\", { stream: true }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"anthropic\");\n    expect(res.headers.get(\"x-understudy-fallback\")).toBe(\"from openai/gpt-5-mini\");\n\n    const text = await res.text();\n    expect(text).toContain(\"event: response.created\");\n    expect(text).toContain(\"event: response.output_text.delta\");\n    expect(text).toContain('\"delta\":\"claude to the rescue\"');\n    expect(text).toContain(\"event: response.completed\");\n  });\n});\n\ndescribe(\"MODEL_OVERRIDES\", () => {\n  it(\"rewrites the requested model before routing\", async () => {\n    const app = await freshApp({\n      GROQ_API_KEY: \"gk-test\",\n      MODEL_OVERRIDES: \"claude-3-5-haiku*=groq/llama-3.3-70b\",\n    });\n    const fetchMock = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {\n      expect(String(url)).toBe(\"https://api.groq.com/openai/v1/chat/completions\");\n      const sent = JSON.parse(String(init?.body));\n      expect(sent.model).toBe(\"llama-3.3-70b\");\n      return new Response(JSON.stringify(openaiCompletion(\"llama-3.3-70b\", \"overridden\")), {\n        status: 200,\n        headers: { \"content-type\": \"application/json\" },\n      });\n    });\n    vi.stubGlobal(\"fetch\", fetchMock);\n\n    const res = await app.request(\"/v1/chat/completions\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: JSON.stringify({\n        model: \"claude-3-5-haiku-20241022\",\n        messages: [{ role: \"user\", content: \"hi\" }],\n      }),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"groq\");\n  });\n\n  it(\"applies on the Messages front door too, answering in Anthropic shape\", async () => {\n    const app = await freshApp({\n      DEEPSEEK_API_KEY: \"dk-test\",\n      MODEL_OVERRIDES: \"claude-*=deepseek/deepseek-chat\",\n    });\n    vi.stubGlobal(\n      \"fetch\",\n      vi.fn(\n        async () =>\n          new Response(JSON.stringify(openaiCompletion(\"deepseek-chat\", \"ds answer\")), {\n            status: 200,\n            headers: { \"content-type\": \"application/json\" },\n          }),\n      ),\n    );\n\n    const res = await app.request(\"/v1/messages\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    expect(res.headers.get(\"x-understudy-provider\")).toBe(\"deepseek\");\n    const json = (await res.json()) as { type: string; content: Array<{ text: string }> };\n    expect(json.type).toBe(\"message\");\n    expect(json.content[0]?.text).toBe(\"ds answer\");\n  });\n});\n\ndescribe(\"/v1/messages/count_tokens\", () => {\n  it(\"estimates locally when no upstream key is configured\", async () => {\n    const app = await freshApp();\n    const res = await app.request(\"/v1/messages/count_tokens\", {\n      method: \"POST\",\n      headers: { \"content-type\": \"application/json\" },\n      body: messagesBody(\"claude-sonnet-4-6\"),\n    });\n    expect(res.status).toBe(200);\n    const json = (await res.json()) as { input_tokens: number };\n    expect(json.input_tokens).toBeGreaterThan(0);\n  });\n});\n"}}}}