namae/util/testHelpers.ts

export async function mockProvider(
  provider: any,
  query: unknown
): Promise<string> {
  const req = {
    query,
  };
  const res = {
    status: jest.fn().mockReturnThis(),
    send: jest.fn().mockReturnThis(),
    json: jest.fn().mockReturnThis(),
    setHeader: jest.fn(),
  };
  await provider(req, res);
  return res.json.mock.calls[0][0];
}