import org.junit.Assert;

public class SimpleMathTest {

    SimpleMath math;

    @org.junit.Before
    public void setUp() throws Exception {
        math = new SimpleMath();
    }

    @org.junit.Test
    public void testSum() throws Exception {
        Assert.assertTrue(math.sum(4, 5) == 9);
        Assert.assertTrue(math.sum(0, 0) == 0);
        Assert.assertTrue(math.sum(0, -1) == -1);
        Assert.assertTrue(math.sum(6, -6) == 0);
        Assert.assertTrue(math.sum(15, -9) == 6);
    }

    @org.junit.Test
    public void testDifference() throws Exception {
        Assert.assertTrue(math.difference(4, 5) == -1);
        Assert.assertTrue(math.difference(0, 0) == 0);
        Assert.assertTrue(math.difference(0, -1) == 1);
        Assert.assertTrue(math.difference(6, -6) == 12);
        Assert.assertTrue(math.difference(15, 5) == 10);
    }
}