Use a mock for FileWatcher

Reviewed By: davidaurelio

Differential Revision: D2628885

fb-gh-sync-id: f8b96c483eb7deb52a7ca4897801e2d0ef9e4f4c

react-packager/src/DependencyResolver/__tests__/Module-test.js

@@ -13,7 +13,6 @@ jest
   .dontMock('../fastfs')
   .dontMock('../replacePatterns')
   .dontMock('../DependencyGraph/docblock')
-  .dontMock('../../FileWatcher')
   .dontMock('../Module');
 
 jest
@@ -24,10 +23,12 @@ var Module = require('../Module');
 var ModuleCache = require('../ModuleCache');
 var Promise = require('promise');
 var fs = require('fs');
-var FileWatcher = require('../../FileWatcher');
 
 describe('Module', () => {
-  const fileWatcher = new FileWatcher(['/root']);
+  const fileWatcher = {
+    on: () =>  this,
+    isWatchman: () => Promise.resolve(false),
+  };
 
   describe('Async Dependencies', () => {
     function expectAsyncDependenciesToEqual(expected) {

react-packager/src/DependencyResolver/fastfs.js

@@ -1,3 +1,11 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
 'use strict';
 
 const Promise = require('promise');

react-packager/src/__mocks__/fs.js

@@ -81,7 +81,7 @@ fs.stat.mockImpl(function(filepath, callback) {
   var mtime = {
     getTime: function() {
       return Math.ceil(Math.random() * 10000000);
-    }
+    },
   };
 
   if (node.SYMLINK) {