Tweak Jest default settings (facebook#378)

Disable timer mocking and enable verbose output.

Author: gaearon

config/jest/environment.js

@@ -0,0 +1,7 @@
+// Currently, Jest mocks setTimeout() and similar functions by default:
+// https://facebook.github.io/jest/docs/timer-mocks.html
+// We think this is confusing, so we disable this feature.
+// If you see value in it, run `jest.useFakeTimers()` in individual tests.
+beforeEach(() => {
+ jest.useRealTimers();
+});

scripts/eject.js

@@ -41,6 +41,7 @@ prompt(
  path.join('config', 'webpack.config.prod.js'),
  path.join('config', 'jest', 'CSSStub.js'),
  path.join('config', 'jest', 'FileStub.js'),
+ path.join('config', 'jest', 'environment.js'),
  path.join('config', 'jest', 'transform.js'),
  path.join('scripts', 'build.js'),
  path.join('scripts', 'start.js'),

scripts/utils/createJestConfig.js

@@ -19,7 +19,9 @@ module.exports = (resolve, rootDir) => {
  setupFiles: [
  resolve('config/polyfills.js')
  ],
- testEnvironment: 'node'
+ setupTestFrameworkScriptFile: resolve('config/jest/environment.js'),
+ testEnvironment: 'node',
+ verbose: true
  };
  if (rootDir) {
  config.rootDir = rootDir;