Unit testing frameworks

In this section, two of the most used Java frameworks for unit testing are shown and briefly commented on. We will focus on their syntax and main features by comparing a test class written using both JUnit and TestNG. Although there are slight differences, both frameworks offer the most commonly-used functionalities, and the main difference is how tests are executed and organized.

Let's start with a question. What is a test? How can we define it?

Note

A test is a repeatable process or method that verifies the correct behavior of a tested target in a determined situation with a determined input expecting a predefined output or interactions.

In the programming approach, there are several types of tests depending on their scope: functional tests, acceptance tests, and unit tests. Further on, we will explore each of those types of tests in more detail.

Unit testing is about testing small pieces of code. Let's see how to test a single Java class. The class is quite...