fix($injector): instantiate returns instance, if non-object value returned from constructor

src/Injector.js

@@ -429,12 +429,15 @@ function createInjector(modulesToLoad) {
       }
     }
 
-    function instantiate(Type, locals){
-      var Constructor = function(){},
-          instance;
+    function instantiate(Type, locals) {
+      var Constructor = function() {},
+          instance, returnedValue;
+
       Constructor.prototype = Type.prototype;
       instance = new Constructor();
-      return invoke(Type, instance, locals) || instance;
+      returnedValue = invoke(Type, instance, locals);
+
+      return isObject(returnedValue) ? returnedValue : instance;
     }
 
     return {

test/InjectorSpec.js

@@ -606,8 +606,12 @@ describe('injector', function() {
 
 
     it('should allow constructor to return different object', function() {
-      var t = $injector.instantiate(function() { return 'ABC'; });
-      expect(t).toBe('ABC');
+      var obj = {};
+      var Class = function() {
+        return obj;
+      };
+
+      expect($injector.instantiate(Class)).toBe(obj);
     });
 
 
@@ -616,6 +620,25 @@ describe('injector', function() {
         $injector.instantiate(function() { throw 'MyError'; });
       }).toThrow('MyError');
     });
+
+
+    it('should return instance if constructor returns non-object value', function() {
+      var A = function() {
+        return 10;
+      };
+
+      var B = function() {
+        return 'some-string';
+      };
+
+      var C = function() {
+        return undefined;
+      };
+
+      expect($injector.instantiate(A) instanceof A).toBe(true);
+      expect($injector.instantiate(B) instanceof B).toBe(true);
+      expect($injector.instantiate(C) instanceof C).toBe(true);
+    });
   });
 
   describe('protection modes', function() {