Jest: 테스트에서 console.error/warn/log 덮어쓰기 허용

조롱 함수 jest.fn() 사용:

console.warn = jest.fn(warn => {
  throw new Error(warn);
});

@thymikee 전역 설정 파일을 사용하여 예상대로 작동하지 않습니다.

"setupTestFrameworkScriptFile": "<rootDir>/tools/jest/setup-framework.js"

beforeEach(() => {
  console.error = jest.fn((error) => {
    throw new Error(error);
  });
});

테스트 중:

const somePromiseThatLogsConsoleError = () => {
  return new Promise((resolve, reject) => {
    console.error('foobar');
    resolve();
  });
});

it('test that has console.error', () => {
  return somePromiseThatLogsConsoleError().then(() => {
    expect(false).toBeTrue();
  });
});

방금 시도했고 작동했습니다.

// test file
test('lol', () => {
  return new Promise((resolve) => {
    console.log('lol');
    resolve();
  });
});

// setup file
global.console.log = () => {
  throw new Error('hey!');
};

결과:

 __tests__/test-test.js
  ✕ lol (3ms)

  ● lol

    hey!

      at CustomConsole.Object.<anonymous>.global.console.log (setup.js:2:9)
      at resolve (__tests__/test-test.js:3:13)
      at Object.<anonymous>.test (__tests__/test-test.js:2:10)
      at process._tickCallback (internal/process/next_tick.js:109:7)

Test Summary
 › Ran all tests.
 › 1 test failed, 0 tests passed (1 total in 1 test suite, run time 0.661s)