This exercise helps you to understand how you can write nested test classes with JUnit 5. Also, after you have finished this exercise, you can understand the invocation order of setup, teardown, and test methods. You can finish this exercise by following these steps:
1. Open the NestedJUnit5Test class which is found from the com.cleantestautomation.junit5intro package.
2. Add a new nested test class called A to the NestedJUnit5Test class and configure the display name of the created nested test class.
3. Add a setup, teardown, and test method to the A class. Implement these methods by writing unique ids to System.out.
4. Add a new nested test class called WhenX to the A class and configure the display name of the created nested test class.
5. Add a setup, teardown, and test method to the WhenX class. Implement these methods by writing unique ids to System.out.
6. Add a new nested test class called WhenY to the A class and configure the display name of the created nested test class.
7. Add a setup, teardown, and test method to the WhenY class. Implement these methods by writing unique ids to System.out.
8. Run your tests and verify that the setup, teardown, and test methods are run in the expected order.