Code once – publish on various platforms is the flexibility given by visual studio to developers. This can be used to test your apps on iOS platform using emulator. This iOS emulator comes with Microsoft visual studio. It may take time initially but once loaded, the emulator works faster. You can upload your project to Github and link the account to Test Object. Test Object has plenty of features like cloud test, GitHub integration, faster loading time and has many iOS devices in its list to select and run. An emulator is nothing but a virtual device replicating the features as it is mostly used for developing purposes. Test Object is an online iOS emulator for MAC computers.