Digits with MethodSource

Like most old and popular programming languages, Java has a huge ecosystem and there are many ways to do one thing.

Consider the LastDigit exercise from the previous lesson. Practice the lesson's syntax by rewriting it using @MethodSource.

This exercise is part of the course

Introduction to Testing in Java

View Course

Exercise instructions

Use the correct annotation for a parameterized test that takes its arguments from a method.
Point the annotation to the arguments provider method.
Use the same syntax three times to create argument pairs.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.*;

import java.util.List;

import static com.datacamp.util.testing.CustomJUnitTestLauncher.launchTestsAndPrint;
import static org.junit.jupiter.api.Assertions.*;

public class LastDigitWithTests {
  public static void main(String[] args) {
    launchTestsAndPrint(LastDigitTest.class);
  }
}

class LastDigit {
    public static int lastDigit(int a) {
        return Math.abs(a) % 10;
    }
}

class LastDigitTest {

    @ParameterizedTest
    // Add the annotation to use a method to provide arguments and point it to the arguments method
    @____("____")
    void testLastDigit(int number, int expected) {
        int actual = LastDigit.lastDigit(number);

        assertEquals(expected, actual);
    }

    private static List getArgs() {
        return List.of(
        	// Create three arguments objects for the test using the same syntax
            ____(2025, 5),
            ____(-2025, 5),
            ____(2020, 0)
        );
    }
}

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