Time for action – writing a simple JUnit 4 test case

This part explains how to write and run a simple JUnit 4 test case in Eclipse.

1. Create a new Java project called com.packtpub.e4.junit.example.

2. Create a class called MathUtil in com.packtpub.e4.junit.example.

3. Create a public static method called isOdd that takes an int and returns a boolean if it is an odd number (using value % 2 == 1).

4. Create a new class called MathUtilTest in a package com.packtpub.e4.junit.example.

5. Create a method called testOdd with an annotation @Test, which is the way JUnit 4 signifies that this method is a test case.

6. Click on the quick-fix to Add JUnit 4 library to the build path, or edit the build path manually to point to Eclipse's plugins/org.junit_4.*.jar.

7. Implement the testOdd method as follows:

   assertTrue(MathUtil.isOdd(3));
   assertFalse(MathUtil.isOdd(4));

8. Add an import static of org.junit.Assert.* to fix the compiler errors.

9. Right-click on the project and choose Run As | JUnit Test, and the JUnit test view should be...