Chapter 11. Test-driven development

This chapter covers

  • The benefits of practicing test-driven development (TDD)
  • The red-green-refactor lifecycle at the heart of TDD
  • A brief intro to JUnit, the de facto Java testing framework
  • The four types of test double: dummy, fake, stub, and mock
  • Testing against an in-memory database for your DAO code
  • Mocking subsystems with Mockito
  • Using ScalaTest, the testing framework for Scala

Test-driven development (TDD) has been part of the software development industry for quite some time. Its basic premise is that you write a test before writing the code that actually provides the implementation, and then you refactor that implementation as needed. For example, in order to write an implementation of concatenating ...

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