Arrange, Act, and Assert Your Way to a Test

A Test Case

Let’s start with a scenario that provides an example of the expected behavior of the target code. To test a ScoreCollection object, we can add the numbers 5 and 7 to the object and expect that the arithmeticMean method will return 6 (because (5+7)/2 is equal to 6).

Remember that naming is important. We call this test answersArithmeticMeanOfTwoNumbers, which nicely summarizes the scenario laid out in the test method.

Run the modified ScoreCollectionTest below to check if it passes.