console.log语句在Jest中不输出任何内容。昨天还挺管用的,今天突然就不管用了。我没有对我的配置做任何更改,也没有安装任何更新。

我没有使用——forceExit选项。仍然看到这个问题。


当前回答

日志记录不能打印的一个潜在原因是console.log被嘲笑了。如下所示

// jest-setup.js
global.console = {
  // eslint-disable-next-line no-undef
  log: jest.fn(), // console.log are ignored in tests
  // log: console.log,

  // Keep native behaviour for other methods, use those to print out things in your own tests, not `console.log`
  error: console.error,
  warn: console.warn,
  info: console.info,
  debug: console.debug,
};
// package.json
  "jest": {
    "preset": "react-native",
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json",
      "node"
    ],
    "setupFilesAfterEnv": [
      "@testing-library/jest-native/extend-expect",
      "<rootDir>/src/config/jest-setup.js"
    ],
    "testMatch": [
      "<rootDir>/src/**/__tests__/**/*.test.{ts,tsx}"
    ]
  },

如果你想禁用console.log,这是常用的

其他回答

根据https://github.com/facebook/jest/issues/2441上的评论,

尝试在package.json的jest选项中设置verbose: false(或删除它)。

在我的情况下,这个问题是由[只有]旗帜在: It.only()或test。(“文本”,()= > {})

这对我来说很管用:开玩笑——废话连篇

日志记录不能打印的一个潜在原因是console.log被嘲笑了。如下所示

// jest-setup.js
global.console = {
  // eslint-disable-next-line no-undef
  log: jest.fn(), // console.log are ignored in tests
  // log: console.log,

  // Keep native behaviour for other methods, use those to print out things in your own tests, not `console.log`
  error: console.error,
  warn: console.warn,
  info: console.info,
  debug: console.debug,
};
// package.json
  "jest": {
    "preset": "react-native",
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json",
      "node"
    ],
    "setupFilesAfterEnv": [
      "@testing-library/jest-native/extend-expect",
      "<rootDir>/src/config/jest-setup.js"
    ],
    "testMatch": [
      "<rootDir>/src/**/__tests__/**/*.test.{ts,tsx}"
    ]
  },

如果你想禁用console.log,这是常用的

尝试了关于jest配置设置的建议,但无济于事。相反,在我的案例中,问题似乎与不等待异步代码有关:

test("test", async () => {
  console.log("Does output")

  new Promise(resolve => {
    // some expectation depending on async code
    setTimeout(() => resolve(console.log("Does not output")) , 1)
  })
})

相反,等待promise会输出async日志:

test("test", async () => {
  console.log("Does output")

  await new Promise(resolve => {
    // some expectation depending on async code
    setTimeout(() => resolve(console.log("Does output")) , 1)
  })
})

可能相关背景: https://github.com/facebook/jest/issues/2441