Jest test bug found

[Jacke]

• http://facebook.github.io/jest/docs/webpack.html#content
• http://redux.js.org/docs/recipes/WritingTests.html
• https://facebook.github.io/jest/docs/tutorial-react.html
• https://auth0.com/blog/testing-react-applications-with-jest/
• http://academy.plot.ly/react/6-testing/

[Jacke]

 "jest2": {
    "collectCoverageFrom": [
      "app/**/*.{ts,tsx}"
    ],
    "setupFiles": [
      "<rootDir>/config/polyfills.js"
    ],
    "testPathIgnorePatterns": [
      "<rootDir>[/\\\\](build|docs|node_modules)[/\\\\]"
    ],
    "testEnvironment": "node",
    "testURL": "http://localhost",
    "transform": {
      "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
      "^.+\\.tsx?$": "<rootDir>/config/jest/typescriptTransform.js",
      "^(?!.*\\.(css|json)$)": "<rootDir>/config/jest/fileTransform.js"
    },
    "transformIgnorePatterns": [
      "[/\\\\]node_modules[/\\\\].+\\.(js|jsx)$"
    ],
    "moduleNameMapper": {
      "^react-native$": "react-native-web"
    },
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx"
    ],
    "testRegex": "(/__tests__/.*|\\.(test|spec))\\.(js|jsx)$"
  }