05. Exercise: Writing Unit Tests

Create a new test class. Remember that the name of the class should be the same as the class under test, but with Test at the end, and that the class should be in the same package as the tested class, except in the src/test/java directory.

Add a new method to the test class that uses the @Test annotation. This method should test the getTotals method of the TotalsCalculator correctly adds up the values for multiple items.

Use assertAll to make sure both the subTotals and taxes match.

Run the unit test!