Learn Unit Test in Java with Junit 5 and Mockito

Test in Java

Unit tests are essential to develop robust applications and JUnit 5 and Mockito are ideal for Java

What you’ll learn

  • You will learn to perform Unit Tests with JUnit 5 and Mockito
  • The JUnit 5 framework for unit tests
  • The Mock framework for unit tests
  • What is a Mock and how does it make life easier by doing tests?
  • More robust applications
  • Learn how to program without Bugs

Learn Unit Test in Java with Junit 5 and Mockito

Requirements

  • You must have programming knowledge in Java. What is a Class, Interface, Object-Oriented Programming?

If you’ve been developing Java code for any period of time, you are probably intimately familiar with test-driven development, so I’ll keep this section brief. It’s important to understand why we write unit tests, however, as well as the strategies developers employ when designing unit tests.

Test-driven development (TDD) is a software development process that interweaves coding, testing, and design. It is a test-first approach that aims to improve the quality of your applications. Test-driven development is defined by the following lifecycle:

  1. Add a test.
  2. Run all of your tests and observe the new test failing.
  3. Implement the code.
  4. Run all of your tests and observe the new test succeeding.
  5. Refactor the code.

There’s a twofold purpose to writing tests before writing your code. First, it forces you to think about the business problem you are trying to solve. For example, how should successful scenarios behave?

What conditions should fail? How should they fail?  Second, testing first gives you more confidence in your tests. Whenever I write tests after writing code, I always have to break them to ensure that they are actually catching errors. Writing tests first avoids this extra step.

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