In the previous step, we explored how to write unit tests using stub implementations. While stubs work for small scenarios, we saw that they become hard to manage and maintain as the complexity of tests grows. 1. What is Mockito? Mockito is a mocking framework for Java. Mockito allows convenient creation of substitutes of real…

In our previous tutorial, we built a simple business logic component using JUnit 5 and observed how real-world applications often involve dependencies like external services. This step is about unit testing such dependencies—first using a stub before we learn how to use Mockito in later lessons. 1. From Simple Input to Service-Driven Logic Previously, we…

Unit testing is the foundation of reliable software development. Before exploring advanced mocking frameworks like Mockito, it’s crucial to understand how to write basic unit tests with JUnit 5. 1. Create a Simple Business Class Let’s create a simple class called SomeBusinessImpl that contains a method to calculate the sum of integers in an array.…