Question

我的React项目中有Jest测试，但是我还没有覆盖所有文件。但是，我遇到了这些错误：

Failed to collect coverage from  /home/user/Development/VideoManager/VideoManagerClient/src/components/AppContent/VideoListLayout/VideoListLayout.js
ERROR: Cannot read property 'coverageData' of null
STACK: TypeError: Cannot read property 'coverageData' of null

此处提到的文件尚未为其创建单元测试。我希望将其简单地跟踪为缺少覆盖范围，从而降低整个覆盖范围的统计数据，而不是抛出错误。

此外，当我在IDE中运行单独的测试时，由于日志没有运行其他测试，因此日志中充满了更多此类错误。

我该如何解决？谢谢。

PS。这是我的Jest配置：

"jest": {
    "collectCoverage": true,
    "coverageReporters": [
      "html"
    ],
    "coverageThreshold": {
      "global": {
        "branches": 80,
        "functions": 80,
        "lines": 80,
        "statements": 80
      }
    },
    "collectCoverageFrom": [
      "src/**/*.{js,jsx,ts,tsx}",
      "!src/**/*.d.ts",
      "!src/serviceWorker.js"
    ],
    "resolver": "jest-pnp-resolver",
    "setupFiles": [
      "react-app-polyfill/jsdom"
    ],
    "setupFilesAfterEnv": [
      "<rootDir>/test/setupTests.js"
    ],
    "testMatch": [
      "<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}",
      "<rootDir>/src/**/?(*.)(spec|test).{js,jsx,ts,tsx}",
      "<rootDir>/test/**/*.{js,jsx,ts,tsx}"
    ],
    "testPathIgnorePatterns": [
      "<rootDir>/test/setupTests.js",
      "<rootDir>/test/mock/.*",
      "<rootDir>/test/exclude/.*"
    ],
    "testEnvironment": "jsdom",
    "testURL": "http://localhost",
    "transform": {
      "^.+\\.(js|jsx|ts|tsx)$": "<rootDir>/node_modules/babel-jest",
      "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
      "^(?!.*\\.(js|jsx|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
    },
    "transformIgnorePatterns": [
      "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|ts|tsx)$",
      "^.+\\.module\\.(css|sass|scss)$"
    ],
    "moduleNameMapper": {
      "^react-native$": "react-native-web",
      "^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy",
      "\\.(css|sass|scss)$": "identity-obj-proxy"
    },
    "moduleFileExtensions": [
      "web.js",
      "js",
      "web.ts",
      "ts",
      "web.tsx",
      "tsx",
      "json",
      "web.jsx",
      "jsx",
      "node"
    ]
  }

Answer 1

在使用jest version 24.1.0和babel-jest version 23.6.0时，我遇到了完全相同的问题。

通过将babel-jest版本更新为24.0.0来解决。

希望有帮助。

玩笑测试覆盖率-文件没有测试时的错误

1 个答案: