TypeError: Cannot read property 'hide' of undefined

 FAIL  src/App.test.js
  ✕ renders correctly (86ms)

  ● renders correctly

    TypeError: Cannot read property 'hide' of undefined

      45 |     // do stuff while splash screen is shown
      46 |     // After having done stuff (such as async tasks) hide the splash screen
    > 47 |     SplashScreen.hide()
      48 |   }
      49 |
      50 |   render() {

      at App.componentDidMount (src/App.js:47:34)
      at commitLifeCycles (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:5461:24)
      at commitAllLifeCycles (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:6250:9)
      at Object.invokeGuardedCallback$1 (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:2159:10)
      at invokeGuardedCallback (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:2106:29)
      at commitAllWork (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:6371:9)
      at workLoop (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:6643:13)
      at Object.invokeGuardedCallback$1 (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:2159:10)
      at invokeGuardedCallback (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:2106:29)
      at performWork (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:6756:7)

  console.error node_modules/react-test-renderer/cjs/react-test-renderer.development.js:2053
    The above error occurred in the <App> component:
        in App

    Consider adding an error boundary to your tree to customize error handling behavior.
    You can learn more about error boundaries at https://fb.me/react-error-boundaries.

  console.warn node_modules/react-native/jest/setup.js:99
    Calling .blur() in the test renderer environment is not supported. Instead, mock out your components that use findNodeHandle with replacements that don't rely on the native environment.

[rowinbot]

Solution is simple, because of the use of Native Modules, when you are running into a test environment those modules are unavailable, so you have to make a jest mock to actually test it, just like this:

jest.mock('react-native-splash-screen', () => {
  return { 
    hide: jest.fn(),
    show: jest.fn()
  };
});

[ghasemikasra39]

Getting this error for react-native-bootsplash, adding mocks did not help