javascript - 有没有办法用 Jest 按顺序运行一些测试？

Question

Jest默认情况下并行运行您的测试套件，但有一个标志 (--runInBand) 允许您按顺序运行整个套件(如指出的 here )

我有一些无法并行运行的测试，但按顺序运行整个套件总共需要更长的时间，所以我的问题是是否有办法只运行一些测试(例如为这些测试或类似的东西设置一个标志)。

Answer 1

我也需要同样的功能。我有一大套要运行的 Jest 集成测试套件。但是，由于需要设置和拆卸共享资源，有些无法并行运行。所以，这是我想出的解决方案。

我更新了我的 package.json 脚本:

{
  ...
  "scripts": {
    ...
    "test": "npm run test:unit && npm run test:integration",
    "test:integration": "jest --config=__tests__/integration/jest.config.js",
    "test:unit": "jest --config=__tests__/unit/jest.config.js"
  },
  ...
}

到

{
  ...
  "scripts": {
    ...
    "test": "npm run test:unit && npm run test:integration",
    "test:integration": "npm run test:integration:sequential && npm run test:integration:parallel",
    "test:integration:parallel": "jest --config=__tests__/integration/jest.config.js",
    "test:integration:sequential": "jest --config=__tests__/integration/jest.config.js --runInBand",
    "test:unit": "jest --config=__tests__/unit/jest.config.js"
  },
  ...
}

然后我从

更新了 __tests__/integration/jest.config.js

module.exports = {
  // Note: rootDir is relative to the directory containing this file.
  rootDir: './src',
  setupFiles: [
    '../setup.js',
  ],
  testPathIgnorePatterns: [
    ...
  ],
};

到

const Path = require('path');

const { defaults } = require('jest-config');
const klawSync = require('klaw-sync')
const mm = require('micromatch');

// Note: rootDir is relative to the directory containing this file.
const rootDir = './src';
const { testMatch } = defaults;

// TODO: Add the paths to the test suites that need to be run
// sequentially to this array.
const sequentialTestPathMatchPatterns = [
  '<rootDir>/TestSuite1ToRunSequentially.spec.js',
  '<rootDir>/TestSuite2ToRunSequentially.spec.js',
  ...
];

const parallelTestPathIgnorePatterns = [
  ...
];

let testPathIgnorePatterns = [
  ...parallelTestPathIgnorePatterns,
  ...sequentialTestPathMatchPatterns,
];

const sequential = process.argv.includes('--runInBand');
if (sequential) {
  const absRootDir = Path.resolve(__dirname, rootDir);
  let filenames = klawSync(absRootDir, { nodir: true })
    .map(file => file.path)
    .map(file => file.replace(absRootDir, ''))
    .map(file => file.replace(/\\/g, '/'))
    .map(file => '<rootDir>' + file);
  filenames = mm(filenames, testMatch);
  testPathIgnorePatterns = mm.not(filenames, sequentialTestPathMatchPatterns);
}

module.exports = {
  rootDir,
  setupFiles: [
    '../setup.js',
  ],
  testMatch,
  testPathIgnorePatterns,
};

更新后的jest.config.js依赖于jest-config、klaw-sync和micromatch .

npm install --save-dev jest-config klaw-sync micromatch

现在，如果您只想运行需要按顺序运行的测试，则可以运行 npm run test:integration:sequential。

或者运行 npm run test:integration:parallel 进行并行测试。

或者运行 npm run test:integration 以首先运行顺序测试。完成后，并行测试将运行。

或者运行 npm run test 来运行单元测试和集成测试。

注意:我在单元和集成测试中使用的目录结构如下:

__tests__
  integration
    src
      *.spec.js
      *.test.js
    jest.config.js
  unit
    src
      *.spec.js
      *.test.js
    jest.config.js