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gaia/apps/communications/test/unit/mocks_helper.js

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+'use strict';
+
+var MocksHelper = function(mocks) {
+  this.mocks = mocks;
+  this.realWindowObjects = {};
+};
+
+MocksHelper.prototype = {
+
+  init: function mh_init() {
+    this.mocks.forEach(function(objName) {
+      if (! window[objName]) {
+        window[objName] = null;
+      }
+    });
+  },
+
+  setup: function mh_setup() {
+    this._forEachMock('mSetup');
+  },
+
+  suiteSetup: function mh_suiteSetup() {
+    this.mocks.forEach(function(objName) {
+      var mockName = 'Mock' + objName;
+      if (!window[mockName]) {
+        var errMsg = 'Mock ' + mockName + ' has not been loaded into the test';
+        throw new Error(errMsg);
+      }
+
+      this.realWindowObjects[objName] = window[objName];
+      window[objName] = window[mockName];
+    }, this);
+    this._forEachMock('mSuiteSetup');
+  },
+
+  suiteTeardown: function mh_suiteTeardown() {
+    this._forEachMock('mSuiteTeardown');
+    this.mocks.forEach(function(objName) {
+      window[objName] = this.realWindowObjects[objName];
+    }, this);
+  },
+
+  teardown: function mh_teardown() {
+    this._forEachMock('mTeardown');
+  },
+
+  _forEachMock: function mh_forEachMock(funcName) {
+    this.mocks.forEach(function(objName) {
+      var mockName = 'Mock' + objName;
+      var mock = window[mockName];
+
+      if (mock[funcName]) {
+        mock[funcName]();
+      }
+    });
+  }
+};
+