Unit Testing

Last modified Monday, 22-Apr-2024 14:17:14 UTC.

Unit testing is a software testing method by which individual units of source code, often methods and the methods they call, are tested to determine whether they are fit for use.
- A separate main or other method might be written with calls to the methods being tested, and return values checked.
- This is a common practice, and there are several frameworks that automate this process.
- We will use the JUnit framework.
The JUnit framework
- Provides control over tests
- Read all about it
In IntelliJ ...
1. Create a class, say Foo with a method doTheFoo. Give the method package visibility by omitting the access modifier (see the notes on package visibility).
2. Right click project name, New directory srcTests
3. Right click srcTests, Mark directory as "Test Sources Root"
4. Right click on Foo to Generate ... Tests, and select the methods you want to test. This will create the test class and methods in srcTests.
5. Note the @Test annotation and the import org.junit.jupiter.api.Test;
6. Add import static org.junit.jupiter.api.Assertions.*
7. Add code to test doTheFoo
8. Ctl-Shift-R to run a test configuration.
Example:
JUnitPizzaCost.java
JUnitPizzaCostTests.java
Read more about writing tests, particularly ...
- Assertions, which test conditions in execution.
- Assumptions, which support conditional test execution - a failed assumption results in a test being aborted.
Unit testing for Objects
- Create the objects you need as instance data in the test class
- Invoke tests on public methods of those objects
- Example:
  Species2.java,
  UseSpecies2.java
  Species2Tests.java

Unit Testing

Exercises

Exam Style Questions