Write Test for Quiz

[madhurgupta10]

Summary:
Write tests for Quiz package classes.

Would you like to work on the issue?
Yes

[madhurgupta10]

@misaochan While writing test for QuizController I noticed that context.getResources().getString() is used to get Strings instead we can directly use context.getString() on context, this makes it easier to mock during the test, should I change this in the class?

[maskaravivek]

Yes, feel free to make this change. It won't affect the behavior.