25.7. Writing Your First Unit Test with JUnit 5

Try these first

1. 1.

   What annotation do you use to mark a test method in JUnit?

   Hint

   It's a single-character text that begins with '@'.

2. 2.

   What is the purpose of assertEquals?

   Hint

   Think of equality checking.

3. 3.

   What does the @Test annotation do?

   • Marks a test class
   • Marks a test method
   • Marks a helper method

   Hint

   Look at which entity it is marking!

4. 4.

   The method assertEquals checks if _____ .

   Hint

   Consider the meaning of equality in tests.

5. 5.

   Create and implement a unit test for a Calculator class that includes methods for multiplication and division. Ensure all tests are comprehensive.

   Hint

   Think about edge cases when writing your tests.

6. 6.

   Explain the importance of clear failure messages in unit tests and how they aid in debugging.

   Hint

   Why do you think a developer needs clarity when tests fail?