Performing parameterized testing

This leaves one more type of testing to look at, a parameterized test. As you may have realized, if you want to run a test to determine whether the result is accurate for several values, then you will need one method per set of values. JUnit 5 simplifies this task by allowing you to create a list of values. Let’s see how this works. Here is the new parameterized test class:

public class ParameterizedTests {
    private Calculation calc;
    private FinancialData data;

We will not instantiate the FinancialData object here as we did in the previous example. It will be created by a private helper method:

    @BeforeEach
    public void init() {
        calc = new Calculation();
    }

The first annotation declares that this will be a parameterized test. This means that this method will be run once...