mockEndpointRequestWhen

When match(params) returns true, that endpoint.request call gets a one-time stub with output; otherwise the request is unchanged. Use this for branching (e.g. different users or ids).

Example — getUser should expose a tier field in its success type if you mock { tier: 'vip' }.

const spy = mockEndpointRequestWhen(
  getUser,
  (p) => p.id >= 1000,
  { success: { tier: 'vip' } },
);
// id 1 → real client; id 1000 → mocked VIP payload
await getUser.request({ id: 1 });
await getUser.request({ id: 1000 });
spy.mockRestore();