我想知道是否有更好的方法在特定的Jest测试中禁用控制台错误(即在每次测试之前/之后恢复原始控制台)。

以下是我目前的方法:

describe("Some description", () => {
  let consoleSpy;

  beforeEach(() => {
    if (typeof consoleSpy === "function") {
      consoleSpy.mockRestore();
    }
  });

  test("Some test that should not output errors to jest console", () => {
    expect.assertions(2);

    consoleSpy = jest.spyOn(console, "error").mockImplementation();
 
    // some function that uses console error
    expect(someFunction).toBe("X");
    expect(consoleSpy).toHaveBeenCalled();
  });

  test("Test that has console available", () => {
    // shows up during jest watch test, just as intended
    console.error("test");
  });
});

有没有更干净的方式来完成同样的事情?我想避免spyOn,但mockRestore似乎只与它一起工作。


当前回答

对我来说,一个更清晰/干净的方式(读者需要很少的笑话API知识来理解发生了什么),就是手动做mockRestore所做的事情:

// at start of test you want to suppress
const consoleLog = console.log;
console.log = jest.fn();

// at end of test
console.log = consoleLog;

其他回答

beforeAll(() => {
    jest.spyOn(console, 'log').mockImplementation(() => {});
    jest.spyOn(console, 'error').mockImplementation(() => {});
    jest.spyOn(console, 'warn').mockImplementation(() => {});
    jest.spyOn(console, 'info').mockImplementation(() => {});
    jest.spyOn(console, 'debug').mockImplementation(() => {});
});

向@Raja的最佳答案致敬。这是我正在使用的(我会注释,但不能在注释中共享多行代码块)。

与jest v26,我得到这个错误:

We detected setupFilesAfterEnv in your package.json.

Remove it from Jest configuration, and put the initialization code in src/setupTests.js:
This file will be loaded automatically.

因此,我不得不从我的jest配置中删除setupFilesAfterEnv,并将其添加到src/setupTests.js中

// https://stackoverflow.com/questions/44467657/jest-better-way-to-disable-console-inside-unit-tests
const nativeConsoleError = global.console.error

global.console.error = (...args) => {
  if (args.join('').includes('Could not parse CSS stylesheet')) {
    return
  }
  return nativeConsoleError(...args)
}

这里是你可能会用到的所有台词。你可以把它们放在测试中:

jest.spyOn(console, 'warn').mockImplementation(() => {});
console.warn("You won't see me!")
expect(console.warn).toHaveBeenCalled();
console.warn.mockRestore();

如果你只是想做一个特定的测试:

beforeEach(() => {
  jest.spyOn(console, 'warn').mockImplementation(() => {});
});

对我来说,一个更清晰/干净的方式(读者需要很少的笑话API知识来理解发生了什么),就是手动做mockRestore所做的事情:

// at start of test you want to suppress
const consoleLog = console.log;
console.log = jest.fn();

// at end of test
console.log = consoleLog;