MultiplierTest.java

import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class MultiplierTest {

    @Test
    public void testMultiply() {
        // Test case 1
        assertEquals(6, Multiplier.multiply(2, 3));

        // Test case 2
        assertEquals(20, Multiplier.multiply(4, 5));

        // Test case 3
        assertEquals(0, Multiplier.multiply(0, 10));

        // Test case 4
        assertEquals(0, Multiplier.multiply(7, 0));

        // Test case 5
        assertEquals(15, Multiplier.multiply(1, 15));
    }
}