Migrate tests away from "jsdom" environment

Reviewed By: leebyron

Differential Revision: D5748304

fbshipit-source-id: c66df45f1f35333f994c41eb8ff4cfccc1bb04d4

Libraries/Animated/src/__tests__/AnimatedNative-test.js

@@ -9,6 +9,7 @@
 'use strict';
 
 jest
+  .clearAllMocks()
   .setMock('Text', {})
   .setMock('View', {})
   .setMock('Image', {})

Libraries/Network/fetch.js

@@ -14,6 +14,10 @@
 
 'use strict';
 
-import 'whatwg-fetch';
+import whatwg from 'whatwg-fetch';
 
-module.exports = {fetch, Headers, Request, Response};
+if (whatwg && whatwg.fetch) {
+  module.exports = whatwg;
+} else {
+  module.exports = {fetch, Headers, Request, Response};
+}

package.json

@@ -80,7 +80,8 @@
       "denodeify",
       "fbjs",
       "sinon"
-    ]
+    ],
+    "testEnvironment": "node"
   },
   "main": "Libraries/react-native/react-native-implementation.js",
   "files": [