fix(mocks): free up memory after every spec

Author: vojtajina

src/ngMock/angular-mocks.js

@@ -1591,9 +1591,29 @@ window.jasmine && (function(window) {
 
   afterEach(function() {
     var spec = getCurrentSpec();
+    var injector = spec.$injector;
+
     spec.$injector = null;
     spec.$modules = null;
+
+    if (injector) {
+      injector.get('$rootElement').unbind();
+      injector.get('$browser').pollFns.length = 0;
+    }
+
     angular.mock.clearDataCache();
+
+    // clean up jquery's fragment cache
+    angular.forEach(angular.element.fragments, function(val, key) {
+      delete angular.element.fragments[key];
+    });
+
+    MockXhr.$$lastInstance = null;
+
+    angular.forEach(angular.callbacks, function(val, key) {
+      delete angular.callbacks[key];
+    });
+    angular.callbacks.counter = 0;
   });
 
   function getCurrentSpec() {
@@ -1694,7 +1714,7 @@ window.jasmine && (function(window) {
    */
   window.inject = angular.mock.inject = function() {
     var blockFns = Array.prototype.slice.call(arguments, 0);
-    var stack = new Error('Declaration Location').stack;
+    var errorForStack = new Error('Declaration Location');
     return isSpecRunning() ? workFn() : workFn;
     /////////////////////
     function workFn() {
@@ -1710,10 +1730,12 @@ window.jasmine && (function(window) {
         try {
           injector.invoke(blockFns[i] || angular.noop, this);
         } catch (e) {
-          if(e.stack) e.stack +=  '\n' + stack;
+          if(e.stack) e.stack +=  '\n' + errorForStack.stack;
           throw e;
+        } finally {
+          errorForStack = null;
         }
       }
     }
-  }
+  };
 })(window);