Pragmatic Unit Testing in Java with JUnit, 3rd Edition

Using the Core Assertion Forms

The bulk of your assertions will use either assertTrue or assertEquals. Let’s review and refine your knowledge of these two assertion workhorses. Let’s also see how to keep your tests streamlined by eliminating things that don’t add value.

The Most Basic Assertion Form: assertTrue

The most basic assert form accepts a Boolean expression or reference as an argument and fails the test if that argument evaluates to false.

org.junit.jupiter.api.Assertions.assertTrue(someBooleanExpression);

Here’s an example demonstrating the use of assertTrue:

utj3-junit/01/src/test/java/scratch/AnAccount.java

@Test
void hasPositiveBalanceAfterInitialDeposit() {
   var account = new Account("an account name");

 account.deposit(50); ...