Test-Driven Java Development, Second Edition - Second Edition

JUnit

JUnit (http://junit.org/) is a simple and easy-to-learn framework for writing and running tests. Each test is mapped as a method, and each method should represent a specific known scenario in which a part of our code will be executed. The code verification is made by comparing the expected output or behavior with the actual output.

The following is the test class written with JUnit. There are some scenarios missing, but for now we are interested in showing what tests look like. We will focus on better ways to test our code and on best practices later in this book.

Test classes usually consist of three stages: set up, test, and tear down. Let's start with methods that set up data needed for tests. A setup can be performed on a class ...