Jest - Unknow "preset“- "jest-react-native”

Question

我正在使用以下package.json (根据http://facebook.github.io/jest/docs/tutorial-react-native.html#content)：

{
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest",
  },
  "dependencies": {
    "react": "^15.3.1",
    "react-native": "0.31.0",
  },
  "devDependencies": {
    "babel-jest": "^14.1.0",
    "babel-preset-react-native": "^1.9.0",
    "jest": "^14.1.0",
    "jest-cli": "^13.1.0",
    "jest-react-native": "^14.1.3",
    "react-test-renderer": "^15.3.1"
  },
  "jest": {
    "globals": {
      "__DEV__": true,
      "__RCTProfileIsProfiling": false
    },
    "preset": "jest-react-native"
  }
}

但是我得到了一个错误：

Error: Unknown config option "preset" with value "jest-react-native". This is either a typing error or another user mistake and fixing it will remove this message.
Using Jest CLI v13.2.3, jasmine2, babel-jest
 FAIL  __tests__/AuthorRequest-test.js (0s)
● Runtime Error
  - Error: Cannot find module 'throwOnWrongReactAPI' from 'react-native.js'
        at Resolver.resolveModule (node_modules/jest-cli/node_modules/jest-resolve/build/index.js:197:17)
        at eval (node_modules/react-native/Libraries/react-native/react-native.js:180:26)
        at Object.<anonymous> (node_modules/react-native/Libraries/react-native/react-native.js:189:4)
1 test suite failed, 0 tests passed (0 total in 1 test suite, run time 2.238s)
npm ERR! Test failed.  See above for more details.

我的.babelrc文件包含：

{
  "presets": ["react-native"]
}

Answer 1

我有一种感觉，您使用的Jest版本是错误的。您必须：

"jest": "^14.1.0",
"jest-cli": "^13.1.0"

但是您似乎已经使用npm -g安装了13.2.3

Using Jest CLI v13.2.3, jasmine2, babel-jest

首先，我认为您可以删除jest-cli，只使用jest 14.1.0。

然后，您可以更新test脚本，如下所示：

"scripts": {
  "test": "./node_modules/jest/bin/jest.js"
}

通过这种方式，您可以确保运行项目的本地Jest副本，因此它现在应该显示：

Using Jest CLI v14.1.0, jasmine2, babel-jest

这样做，并遵循您发布的官方docs，它应该是您需要的一切(不能肯定，因为您没有发布测试代码)。