Mastering Software Testing with JUnit 5

Test execution in JUnit 4

The concept of the test runner is also present in JUnit 4, but it was slightly improved with respect to JUnit 3. In JUnit 4, a test runner is a Java class used to manage a test’s life cycle: instantiation, calling setup and teardown methods, running the test, handling exceptions, sending notifications, and so on. The default JUnit 4 test runner is called BlockJUnit4ClassRunner, and it implements the JUnit 4 standard test case class model.

The test runner to be used in a JUnit 4 test case can be changed simply using the annotation @RunWith. JUnit 4 provides a collection of built-in test runners that allows to change the nature of the test class. In this section, we are going to review the most important ones.

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