Upgrade to Jest 16 (#858)

* Update react-scripts dependencies to use jest 16

* Remove testRegex from Jest config (now default)

packages/react-scripts/package.json

@@ -26,7 +26,7 @@
     "autoprefixer": "6.4.1",
     "babel-core": "6.14.0",
     "babel-eslint": "6.1.2",
-    "babel-jest": "15.0.0",
+    "babel-jest": "16.0.0",
     "babel-loader": "6.2.5",
     "babel-preset-react-app": "^0.2.1",
     "case-sensitive-paths-webpack-plugin": "1.1.4",
@@ -51,7 +51,7 @@
     "gzip-size": "3.0.0",
     "html-webpack-plugin": "2.22.0",
     "http-proxy-middleware": "0.17.1",
-    "jest": "15.1.1",
+    "jest": "16.0.1",
     "json-loader": "0.5.4",
     "object-assign": "4.1.0",
     "path-exists": "2.1.0",

packages/react-scripts/utils/createJestConfig.js

@@ -27,7 +27,6 @@ module.exports = (resolve, rootDir, isEjecting) => {
     setupTestFrameworkScriptFile: setupTestsFile,
     testPathIgnorePatterns: ['<rootDir>/(build|docs|node_modules)/'],
     testEnvironment: 'node',
-    testRegex: '(/__tests__/.*|\\.(test|spec))\\.(js|jsx)$',
   };
   if (rootDir) {
     config.rootDir = rootDir;