Java 9 Programming By Example

Good unit tests

Is this a good unit test? If you read it in a tutorial book like this, it has to be. Actually, it is not. It is a good code to demonstrate some of the tools that JUnit provides and some Java language features, but as a real JUnit test, I will not use it in a real life project.

What makes a unit test good? To answer this question, we will have to find what the unit test is good for and what it is that we use it for.

We will create unit tests to validate the operation of the units and to document.

Unit tests are not to find bugs. Developers eventually use unit tests during debugging sessions but, many times, the testing code created for the debugging is a temporary one. When the bug is fixed, the code used to find it will not ...