Learn Java Unit Testing with JUnit 5 in 20 Steps - Step 05 - Writing JUnit Assertions - assertNull and assertTrue

The video tutorial covers writing unit tests with a focus on assertions. It begins with an introduction to assertions and testing scenarios, followed by testing the string length method with various cases, including corner cases. The tutorial then explains how to create and run new tests using JUnit, and explores different assert methods like assert not null and assert null. Finally, it demonstrates testing Boolean values using assert true and assert false methods.

What is the primary focus when writing unit tests for a method like string length?

• To test only the most common cases

• To cover all possible scenarios, including corner cases

• To ensure the method runs quickly

• To test only with empty strings

Which annotation is used to create a new test in JUnit?

• @Test

• @TestMethod

• @JUnit

• @RunTest

What is the purpose of the assertEquals method in JUnit tests?

• To verify if a method throws an exception

• To ensure a test runs without errors

• To check if two values are equal

• To compare two strings only

Which of the following is NOT a data type that assertEquals can be used with?

• String

• Integer

• Boolean

• Array

What does the assertNotNull method check for in a test?

• That a value is not null

• That a value is null

• That a value is false

• That a value is true

Which assertion method would you use to verify a boolean condition is false?

• assertTrue

• assertFalse

• assertNull

• assertNotNull

What is the companion method to assertFalse in JUnit?

• assertNull

• assertNotNull

• assertEquals

• assertTrue