Learn Java Unit Testing with JUnit 5 in 20 Steps - Step 09 - Tip - Testing Exceptions with Junit

The video tutorial covers testing exceptions in JUnit, focusing on how to handle NullPointerExceptions. It explains the transition from JUnit 4 to JUnit 5, highlighting the removal of the 'expected' annotation and the introduction of functional programming techniques. The tutorial demonstrates using lambda expressions to test exceptions and discusses the importance of handling test failures when exceptions are not thrown as expected.

What happens when a null value is passed to a method expecting a string in Java?

• It returns zero.

• It throws an IllegalArgumentException.

• It throws a NullPointerException.

• It returns null.

In JUnit 4, which annotation was used to specify an expected exception?

• @Ignore

• @Expected

• @Exception

• @Test

What is the primary method used in JUnit 5 to test for exceptions?

• assertEquals

• assertNotNull

• assertThrows

• assertTrue

How does JUnit 5 allow you to pass code as an argument to a method?

• Using a for loop

• Using a lambda expression

• Using a try-catch block

• Using a switch statement

What is a key benefit of using lambda expressions in exception testing?

• They automatically handle all exceptions.

• They eliminate the need for semicolons.

• They allow passing code as data.

• They make code run faster.

What happens if a test expects an exception but none is thrown?

• The test is skipped.

• The test is ignored.

• The test fails.

• The test passes.

Why is it important to test for exceptions in your code?

• To verify the code handles errors as expected.

• To reduce the number of lines of code.

• To make the code more readable.

• To ensure the code runs faster.