These examples use JUnit 4 which, at the time of writing, is the most used unit testing framework version. Mockito is used to mock objects and it provides sufficient flexibility for the majority of use cases. In order to assert conditions, these examples use AssertJ as the test matching library. It provides functionality to verify the state of objects using productive method-chaining invocations.

These technologies serve as examples for the required test aspects. The point here, however, is not to dictate certain functionalities rather it is to showcase specific, reasonable choices for these test requirements. Other technology that provides similar functionality and benefits is equally advisable.

A typical example of another widely-used technology is Hamcrest matchers as a test matching library or the less frequently used TestNG unit test framework.

By the time you're reading this, JUnit version 5 will have emerged, which provides some additional functionalities, especially regarding to dynamic tests. Dynamic tests have similar motivations as parameterized tests, by programmatically and dynamically defining test cases.