Fix the test case

test/loopback.test.js

@@ -4,7 +4,7 @@ describe('loopback', function() {
       var dataSource = loopback.createDataSource({
         connector: loopback.Memory
       });
-      assert(dataSource.connector());
+      assert(dataSource.connector);
     });
   });
   
@@ -31,4 +31,4 @@ describe('loopback', function() {
       assert.equal(Product.stats.shared, true);
     });
   });
-});
+});