api.test.ts

import { describe, expect, it, vi } from 'vitest';
import { ApiError, fetchMe } from '../src/lib/api';
import type { StoredSession } from '../src/lib/session';

const SESSION: StoredSession = { accessToken: 'access-123', idToken: 'id-456', expiresAt: Date.now() + 1000 };
const ME_BODY = { userId: 'u1', email: 'user@example.com', created: false, plan: 'free', status: 'active', forcedDryRun: true };

describe('fetchMe', () => {
  it('sends the ID token as the bearer, not the access token', async () => {
    const fetchMock = vi.fn(async (_url: string, init: RequestInit) => {
      expect((init.headers as Record<string, string>).Authorization).toBe('Bearer id-456');
      return new Response(JSON.stringify(ME_BODY), { status: 200 });
    });
    await fetchMe('https://api.example.com', SESSION, fetchMock as unknown as typeof fetch);
    expect(fetchMock).toHaveBeenCalledWith('https://api.example.com/me', expect.anything());
  });

  it('returns the parsed body on success', async () => {
    const fetchMock = vi.fn(async () => new Response(JSON.stringify(ME_BODY), { status: 200 }));
    const me = await fetchMe('https://api.example.com', SESSION, fetchMock as unknown as typeof fetch);
    expect(me).toEqual(ME_BODY);
  });

  it('fails closed with the status code on a non-2xx response', async () => {
    const fetchMock = vi.fn(async () => new Response('unauthenticated', { status: 401 }));
    await expect(fetchMe('https://api.example.com', SESSION, fetchMock as unknown as typeof fetch)).rejects.toMatchObject({
      status: 401,
    });
  });

  it('rejects with ApiError specifically, not a generic Error', async () => {
    const fetchMock = vi.fn(async () => new Response('', { status: 500 }));
    await expect(fetchMe('https://api.example.com', SESSION, fetchMock as unknown as typeof fetch)).rejects.toBeInstanceOf(
      ApiError,
    );
  });
});