Java primer

The document is a primer on JUnit that introduces key Java and testing concepts. It covers object-oriented programming principles in Java like classes, objects, and inheritance. It then explains what JUnit is and how to set it up, either by adding its JAR file to the build path or using Maven dependencies. The document outlines how a basic JUnit test is structured with preconditions, test steps, assertions, and cleanup. It also describes various JUnit annotations like @Before, @After, @Test, and @Ignore. Finally, it discusses organizing tests into suites and integrating JUnit with continuous integration systems.