return new Headers(latestAnthropicRequest().init?.headers);

}

function guardedFetchCall(

callIndex = 0,

): [unknown, { method?: unknown; headers?: HeadersInit } | undefined] {

const call = guardedFetchMock.mock.calls[callIndex];

if (!call) {

throw new Error(`expected guarded fetch call ${callIndex + 1}`);

}

return call as [unknown, { method?: unknown; headers?: HeadersInit } | undefined];

}

function requireRecord(value: unknown, label: string): Record<string, unknown> {

if (!value || typeof value !== "object" || Array.isArray(value)) {

throw new Error(`Expected ${label}`);

);

expect(buildGuardedModelFetchMock).toHaveBeenCalledWith(model);

const [url, init] = guardedFetchMock.mock.calls.at(0) ?? [];

const [url, init] = guardedFetchCall();

expect(url).toBe("https://api.anthropic.com/v1/messages");

expect(init?.method).toBe("POST");

const headers = new Headers(init?.headers);

} as AnthropicStreamOptions,

);

expect(guardedFetchMock.mock.calls.at(0)?.[0]).toBe("https://custom-proxy.example/v1/messages");

expect(guardedFetchMock.mock.calls.at(0)?.[1]?.method).toBe("POST");

const [url, init] = guardedFetchCall();

expect(url).toBe("https://custom-proxy.example/v1/messages");

expect(init?.method).toBe("POST");

expect(latestAnthropicRequestHeaders().get("anthropic-beta")).toBeNull();

});

);

const result = await stream.result();

expect(guardedFetchMock.mock.calls.at(0)?.[0]).toBe("https://api.anthropic.com/v1/messages");

const headers = new Headers(guardedFetchMock.mock.calls.at(0)?.[1]?.headers);

const [url, init] = guardedFetchCall();

expect(url).toBe("https://api.anthropic.com/v1/messages");

const headers = new Headers(init?.headers);

expect(headers.get("authorization")).toBe("Bearer sk-ant-oat-example");

expect(headers.get("x-app")).toBe("cli");

expect(headers.get("user-agent")).toContain("claude-cli/");