“异步”测试永远运行开玩笑

Question

我在新环境中遇到问题

async

用笑话进行测试

    "jest": "^27.4.6",
    "babel-jest": "^27.4.6",
    "react": "17.0.1",
"jest": {
    "preset": "react-native",
    "setupFiles": [
      "<rootDir>/jest/setup.js"
    ],
    "setupFilesAfterEnv": [
      "@testing-library/jest-native/extend-expect"
    ],
    "transformIgnorePatterns": [
      "node_modules/(?!(@react-native|react-native|react-native-android-location-enabler|react-native-config|react-native-actionsheet|@sentry/react-native|reselect|redux-persist)/)"
    ],
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json",
      "node"
    ]
  },

情况是，事件试图运行有史以来最简单的测试，开玩笑，但实际上从未执行它：

const giveMeAfterSec = () => {
    return new Promise(resolve => {
        setTimeout(() => {
            resolve('wow');
        }, 1000);
    });
};

describe('dummy', () => {
    test('async test', async () => {
        const result = await giveMeAfterSec();

        expect(result).toBe('wow');
    });
});

并尝试运行它，我看到永无止境

RUNS src/__tests__/dummy.test.tsx

没有

async await

的每个测试都能正常运行

Answer 1

就我而言，

jest fake timers

是罪魁祸首

// jest-setup.js
jest.useFakeTimers(); // remove this line