Pragmatic Unit Testing in Java with JUnit, 3rd Edition

Testing Common Code Circumstances

As you write more tests, you’ll realize that you’re often facing a number of common circumstances. Here’s a handful of them:

• Add an item to a list
• Do something if a conditional is met
• Update all items in a list that match a predicate
• Remove all items matching a predicate from a list
• Throw an exception when a conditional is met

Lists and other collection types are a heavy part of most software development. You should be able to bang out tests involving lists without much thought.

In this section, you’ll work through how you might write tests for each of those common needs. Hopefully, these examples will help you extrapolate and learn to write tests for other data structures (Maps, Sets, arrays, etc.) and operations ...