Tests not working on freshly created app

[danielantelo]

New to react native, was just going to play about with it tonight.
I´ve done the following:

 npm install -g create-react-native-app # this installed 0.0.6
create-react-native-app  myapp

I can run the start and use the iOS app to scan the QR code and I see the "Open up App.js to start..." message on my phone. Cool!

I then tried to do yarn test and I get the following error:

192:myapp daniel$ yarn test
yarn test v0.24.6
$ node node_modules/jest/bin/jest.js --watch 
jest-haste-map: @providesModule naming collision:
  Duplicate module name: react
  Paths: /Users/daniel/Workspace/myapp/node_modules/lottie-react-native/node_modules/react/package.json collides with /Users/daniel/Workspace/myapp/node_modules/xdl/node_modules/react/package.json

This warning is caused by a @providesModule declaration with the same name across two different files.
jest-haste-map: @providesModule naming collision:
  Duplicate module name: bser
  Paths: /Users/daniel/Workspace/myapp/node_modules/react-native/node_modules/fb-watchman/node_modules/bser/package.json collides with /Users/daniel/Workspace/myapp/node_modules/react-native/node_modules/bser/package.json

This warning is caused by a @providesModule declaration with the same name across two different files.
jest-haste-map: @providesModule naming collision:
  Duplicate module name: bser
  Paths: /Users/daniel/Workspace/myapp/node_modules/react-native/node_modules/jest-haste-map/node_modules/bser/package.json collides with /Users/daniel/Workspace/myapp/node_modules/react-native/node_modules/fb-watchman/node_modules/bser/package.json

This warning is caused by a @providesModule declaration with the same name across two different files.
jest-haste-map: @providesModule naming collision:
  Duplicate module name: fb-watchman
  Paths: /Users/daniel/Workspace/myapp/node_modules/react-native/node_modules/jest-haste-map/node_modules/sane/node_modules/fb-watchman/package.json collides with /Users/daniel/Workspace/myapp/node_modules/react-native/node_modules/fb-watchman/package.json

This warning is caused by a @providesModule declaration with the same name across two different files.
jest-haste-map: @providesModule naming collision:
  Duplicate module name: react
  Paths: /Users/daniel/Workspace/myapp/node_modules/react-native-branch/node_modules/react/package.json collides with /Users/daniel/Workspace/myapp/node_modules/lottie-react-native/node_modules/react/package.json

This warning is caused by a @providesModule declaration with the same name across two different files.
jest-haste-map: @providesModule naming collision:
  Duplicate module name: react
  Paths: /Users/daniel/Workspace/myapp/node_modules/react-native-fbads/node_modules/react/package.json collides with /Users/daniel/Workspace/myapp/node_modules/react-native-branch/node_modules/react/package.json

This warning is caused by a @providesModule declaration with the same name across two different files.
jest-haste-map: @providesModule naming collision:
  Duplicate module name: react
  Paths: /Users/daniel/Workspace/myapp/node_modules/react-native-maps/node_modules/react/package.json collides with /Users/daniel/Workspace/myapp/node_modules/react-native-fbads/node_modules/react/package.json

This warning is caused by a @providesModule declaration with the same name across two different files.
2017-06-22 22:09 node[8274] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
2017-06-22 22:09 node[8274] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
events.js:182
      throw er; // Unhandled 'error' event
      ^

Error: Error watching file for changes: EMFILE
    at exports._errnoException (util.js:1016:11)
    at FSEvent.FSWatcher._handle.onchange (fs.js:1360:11)
error Command failed with exit code 1.

I've not modified any code or configuration. I am using node 8.1.2 and yarn 0.24.6. What can be causing this? do I need to downgrade node or yarn version?

Thanks,

[brentvatne]

hi there!

there are a bunch of warnings there that are gone in the latest version (create a new app to see), the actual error is at the bottom:

2017-06-22 22:09 node[8274] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
2017-06-22 22:09 node[8274] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
events.js:182
      throw er; // Unhandled 'error' event
      ^

Error: Error watching file for changes: EMFILE
    at exports._errnoException (util.js:1016:11)
    at FSEvent.FSWatcher._handle.onchange (fs.js:1360:11)
error Command failed with exit code 1.

this is a common problem if you don't have watchman installed, check out this thread for the solution: facebook/react-native#10088

[brentvatne]

actually I will reopen this because we should maybe suggest to jest folks to handle this error better

[danielantelo]

thanks, I had to install pkg-config first and then watchman:

 brew install pkg-config
 brew install watchman