To develop this project I have followed MVVM - C architecture, here C is configurator where I created all the dependencies and injected them in concerned places. Here I have followed Protocol Oriented Programming concept introduced by Apple which is very efficient, therefore for every View, ViewModel, API etc I have created Protocols so that I could create mock objects for any class by implementing them which are helpful to write unit test cases.
Due to time constraint I have written test cases only for below modules:
- Network class APIClient which is responsible to handle all the network calls. By creating mock object of URLSession I have covered following cases:
- Is this class getting success response if API returns correct data.
- Is this class getting error response if API returns any network error.
- Is this class getting parsing error in case API returns incorrect data.
- ArticleListModelView, this class is responsible to handle all the business logic of calling api to fetch articles and instruct view to display them. By creating mock objects of View and API I have covered following cases:
- Is View refresh list method being called after getting successful response from API.
- Is View show error method being called after getting failure response from API.
Below you can see the complete wireframe of this APP:
