In Test Driven Development, the purpose of unit testing is to help us design our classes and not just to validate the correctness of our code. In this article I want to demonstrate how unit testing forces us to write better code, with help of an example. I will use Mockito for mocking. First, let me define the problem domain I’ll be using in the example. Suppose we have an online booking portal where customers make reservations for travel or accommodation. [Read More]