Pragmatic Unit Testing in Java with JUnit, 3rd Edition

Summary

In this chapter, you learned the important technique of introducing stubs and mocks to emulate the behavior of dependent objects. Your tests don’t have to interact with live services, files, databases, and other troublesome dependencies! You also learned how to use Mockito to simplify your effort in creating and injecting mocks.

You also learned Mockito’s core features, but it can do much more:

• Verify that methods were called in order
• Capture and assert against an argument passed to a mock method
• Spy on a method, which results in the real method getting called

Now that you’re empowered with enough unit testing fundamentals to survive, it’s time to explore some bigger-picture unit testing topics: code coverage, integration testing, and tests ...