Update Jest (#530)

* Update Jest

* Remove default snapshot test

* Fix a few things

* Add a simple default test

* App.spec.js -> App.test.js

* Fix e2e test

* Bump Jest

scripts/utils/createJestConfig.js

@@ -9,25 +9,14 @@
 
 module.exports = (resolve, rootDir) => {
   const config = {
-    automock: false,
     moduleNameMapper: {
       '^[./a-zA-Z0-9$_-]+\\.(jpg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm)$': resolve('config/jest/FileStub.js'),
       '^[./a-zA-Z0-9$_-]+\\.css$': resolve('config/jest/CSSStub.js')
     },
-    persistModuleRegistryBetweenSpecs: true,
     scriptPreprocessor: resolve('config/jest/transform.js'),
-    setupFiles: [
-      resolve('config/polyfills.js')
-    ],
-    setupTestFrameworkScriptFile: resolve('config/jest/environment.js'),
-    testPathIgnorePatterns: ['<rootDir>/node_modules/', '<rootDir>/build/'],
-    // Allow three popular conventions:
-    // **/__tests__/*.js
-    // **/*.test.js
-    // **/*.spec.js
-    testRegex: '(__tests__/.*|\\.(test|spec))\\.js$',
-    testEnvironment: 'node',
-    verbose: true
+    setupFiles: [resolve('config/polyfills.js')],
+    testPathIgnorePatterns: ['<rootDir>/(build|docs|node_modules)/'],
+    testEnvironment: 'node'
   };
   if (rootDir) {
     config.rootDir = rootDir;