diff --git a/src/apis.js b/src/apis.js
index a6df5811c87d..3b0a22ab3191 100644
--- a/src/apis.js
+++ b/src/apis.js
@@ -13,16 +13,16 @@
  * @returns {string} hash string such that the same input will have the same hash string.
  *         The resulting string key is in 'type:hashKey' format.
  */
-function hashKey(obj) {
+function hashKey(obj, nextUidFn) {
   var objType = typeof obj,
       key;
 
-  if (objType == 'object' && obj !== null) {
+  if (objType == 'function' || (objType == 'object' && obj !== null)) {
     if (typeof (key = obj.$$hashKey) == 'function') {
       // must invoke on object to keep the right this
       key = obj.$$hashKey();
     } else if (key === undefined) {
-      key = obj.$$hashKey = nextUid();
+      key = obj.$$hashKey = (nextUidFn || nextUid)();
     }
   } else {
     key = obj;
@@ -34,7 +34,13 @@ function hashKey(obj) {
 /**
  * HashMap which can use objects as keys
  */
-function HashMap(array){
+function HashMap(array, isolatedUid) {
+  if (isolatedUid) {
+    var uid = 0;
+    this.nextUid = function() {
+      return ++uid;
+    };
+  }
   forEach(array, this.put, this);
 }
 HashMap.prototype = {
@@ -44,7 +50,7 @@ HashMap.prototype = {
    * @param value value to store can be any type
    */
   put: function(key, value) {
-    this[hashKey(key)] = value;
+    this[hashKey(key, this.nextUid)] = value;
   },
 
   /**
@@ -52,7 +58,7 @@ HashMap.prototype = {
    * @returns {Object} the value for the key
    */
   get: function(key) {
-    return this[hashKey(key)];
+    return this[hashKey(key, this.nextUid)];
   },
 
   /**
@@ -60,7 +66,7 @@ HashMap.prototype = {
    * @param key
    */
   remove: function(key) {
-    var value = this[key = hashKey(key)];
+    var value = this[key = hashKey(key, this.nextUid)];
     delete this[key];
     return value;
   }
diff --git a/src/auto/injector.js b/src/auto/injector.js
index c74b4d6ddaa3..cf03d23ee33c 100644
--- a/src/auto/injector.js
+++ b/src/auto/injector.js
@@ -591,7 +591,7 @@ function createInjector(modulesToLoad) {
   var INSTANTIATING = {},
       providerSuffix = 'Provider',
       path = [],
-      loadedModules = new HashMap(),
+      loadedModules = new HashMap([], true),
       providerCache = {
         $provide: {
             provider: supportObject(provider),
diff --git a/src/ngMock/angular-mocks.js b/src/ngMock/angular-mocks.js
index 0cba5720d1b3..8846d6860476 100644
--- a/src/ngMock/angular-mocks.js
+++ b/src/ngMock/angular-mocks.js
@@ -1958,6 +1958,12 @@ if(window.jasmine || window.mocha) {
   (window.afterEach || window.teardown)(function() {
     var injector = currentSpec.$injector;
 
+    angular.forEach(currentSpec.$modules, function(module) {
+      if (module && module.$$hashKey) {
+        module.$$hashKey = undefined;
+      }
+    });
+
     currentSpec.$injector = null;
     currentSpec.$modules = null;
     currentSpec = null;
diff --git a/test/ApiSpecs.js b/test/ApiSpecs.js
index 12de39d03fcd..d11558c27fa5 100644
--- a/test/ApiSpecs.js
+++ b/test/ApiSpecs.js
@@ -22,6 +22,36 @@ describe('api', function() {
       expect(map.get('b')).toBe(1);
       expect(map.get('c')).toBe(undefined);
     });
+
+    it('should maintain hashKey for object keys', function() {
+      var map = new HashMap();
+      var key = {};
+      map.get(key);
+      expect(key.$$hashKey).toBeDefined();
+    });
+
+    it('should maintain hashKey for function keys', function() {
+      var map = new HashMap();
+      var key = function() {};
+      map.get(key);
+      expect(key.$$hashKey).toBeDefined();
+    });
+
+    it('should share hashKey between HashMap by default', function() {
+      var map1 = new HashMap(), map2 = new HashMap();
+      var key1 = {}, key2 = {};
+      map1.get(key1);
+      map2.get(key2);
+      expect(key1.$$hashKey).not.toEqual(key2.$$hashKey);
+    });
+
+    it('should maintain hashKey per HashMap if flag is passed', function() {
+      var map1 = new HashMap([], true), map2 = new HashMap([], true);
+      var key1 = {}, key2 = {};
+      map1.get(key1);
+      map2.get(key2);
+      expect(key1.$$hashKey).toEqual(key2.$$hashKey);
+    });
   });
 });
 
diff --git a/test/auto/injectorSpec.js b/test/auto/injectorSpec.js
index 18cca139cfd9..3b1a518090f5 100644
--- a/test/auto/injectorSpec.js
+++ b/test/auto/injectorSpec.js
@@ -293,6 +293,29 @@ describe('injector', function() {
       expect(log).toEqual('abc');
     });
 
+    it('should load different instances of dependent functions', function() {
+      function  generateValueModule(name, value) {
+        return function ($provide) {
+          $provide.value(name, value);
+        };
+      }
+      var injector = createInjector([generateValueModule('name1', 'value1'),
+                                     generateValueModule('name2', 'value2')]);
+      expect(injector.get('name2')).toBe('value2');
+    });
+
+    it('should load same instance of dependent function only once', function() {
+      var count = 0;
+      function valueModule($provide) {
+        count++;
+        $provide.value('name', 'value');
+      }
+
+      var injector = createInjector([valueModule, valueModule]);
+      expect(injector.get('name')).toBe('value');
+      expect(count).toBe(1);
+    });
+
     it('should execute runBlocks after injector creation', function() {
       var log = '';
       angular.module('a', [], function(){ log += 'a'; }).run(function() { log += 'A'; });
diff --git a/test/ngMock/angular-mocksSpec.js b/test/ngMock/angular-mocksSpec.js
index c10bbc83e0fa..856fbb38de7c 100644
--- a/test/ngMock/angular-mocksSpec.js
+++ b/test/ngMock/angular-mocksSpec.js
@@ -805,6 +805,23 @@ describe('ngMock', function() {
             expect(example).toEqual('win');
           });
         });
+
+        describe('module cleanup', function() {
+          function testFn() {
+
+          }
+
+          it('should add hashKey to module function', function() {
+            module(testFn);
+            inject(function () {
+              expect(testFn.$$hashKey).toBeDefined();
+            });
+          });
+
+          it('should cleanup hashKey after previous test', function() {
+            expect(testFn.$$hashKey).toBeUndefined();
+          });
+        });
       });
 
       describe('in DSL', function() {