feat(ngMocks): cleanup $inject annotations after each test

this will help in detecting unannotated functions both in apps and angular core in case only part of the tests are run with strictDi

src/auto/injector.js

@@ -800,7 +800,7 @@ function createInjector(modulesToLoad, strictDi) {
       }
 
       var args = [],
-          $inject = annotate(fn, strictDi, serviceName),
+          $inject = createInjector.$$annotate(fn, strictDi, serviceName),
           length, i,
           key;
 
@@ -839,7 +839,7 @@ function createInjector(modulesToLoad, strictDi) {
       invoke: invoke,
       instantiate: instantiate,
       get: getService,
-      annotate: annotate,
+      annotate: createInjector.$$annotate,
       has: function(name) {
         return providerCache.hasOwnProperty(name + providerSuffix) || cache.hasOwnProperty(name);
       }

src/ngMock/angular-mocks.js

@@ -2127,18 +2127,32 @@ angular.mock.$RootScopeDecorator = ['$delegate', function($delegate) {
 if (window.jasmine || window.mocha) {
 
   var currentSpec = null,
+      annotatedFunctions,
       isSpecRunning = function() {
         return !!currentSpec;
       };
 
+  angular.mock.$$annotate = angular.injector.$$annotate;
+  angular.injector.$$annotate = function(fn) {
+    if (typeof fn === 'function' && !fn.$inject) {
+      annotatedFunctions.push(fn);
+    }
+    return angular.mock.$$annotate.apply(this, arguments);
+  };
+
 
   (window.beforeEach || window.setup)(function() {
+    annotatedFunctions = [];
     currentSpec = this;
   });
 
   (window.afterEach || window.teardown)(function() {
     var injector = currentSpec.$injector;
 
+    annotatedFunctions.forEach(function(fn) {
+      delete fn.$inject;
+    });
+
     angular.forEach(currentSpec.$modules, function(module) {
       if (module && module.$$hashKey) {
         module.$$hashKey = undefined;

test/auto/injectorSpec.js

@@ -238,7 +238,11 @@ describe('injector', function() {
 
 
     it('should publish annotate API', function() {
-      expect(injector.annotate).toBe(annotate);
+      expect(angular.mock.$$annotate).toBe(annotate);
+      spyOn(angular.mock, '$$annotate').andCallThrough();
+      function fn() {}
+      injector.annotate(fn);
+      expect(angular.mock.$$annotate).toHaveBeenCalledWith(fn);
     });
   });
 

test/ngMock/angular-mocksSpec.js

@@ -787,6 +787,39 @@ describe('ngMock', function() {
             expect(testFn.$$hashKey).toBeUndefined();
           });
         });
+
+        describe('$inject cleanup', function() {
+          function testFn() {
+
+          }
+
+          it('should add $inject when invoking test function', inject(function($injector) {
+            $injector.invoke(testFn);
+            expect(testFn.$inject).toBeDefined();
+          }));
+
+          it('should cleanup $inject after previous test', function() {
+            expect(testFn.$inject).toBeUndefined();
+          });
+
+          it('should add $inject when annotating test function', inject(function($injector) {
+            $injector.annotate(testFn);
+            expect(testFn.$inject).toBeDefined();
+          }));
+
+          it('should cleanup $inject after previous test', function() {
+            expect(testFn.$inject).toBeUndefined();
+          });
+
+          it('should invoke an already annotated function', inject(function($injector) {
+            testFn.$inject = [];
+            $injector.invoke(testFn);
+          }));
+
+          it('should not cleanup $inject after previous test', function() {
+            expect(testFn.$inject).toBeDefined();
+          });
+        });
       });
 
       describe('in DSL', function() {