package tests;

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

public class MathTest {
    private static final double DELTA = 0.001;
    
    // Ensure that the absolute value of a negative int is calculated correctly.
    @Test
    public void testAbsIntNegative() {
        int res = Math.abs(-5);
        assertEquals(5, res);
    }

    // Ensure that the absolute value of a positive number is calculated correctly.
    @Test
    public void testAbsIntPositive() {
        int abs = Math.abs(5);
        assertEquals(5, abs);
    }

    // Ensure that the absolute value of zero is calculated correctly.
    @Test
    public void testAbsIntZero() {
        int res = Math.abs(0);
        assertEquals(0, res);
    }


    // Ensure that ceil rounds up for a negative number.
    @Test
    public void testCeilNegative() {
        double res = Math.ceil(-5.25);
        assertEquals(-6, res, DELTA);
    }

    // Ensure that ceil rounds up for a positive number.
    @Test
    public void testCeilPositive() {
        double res = Math.ceil(5.25);
        assertEquals(6, res, DELTA);
    }

    // Ensure that sqrt returns the correct value for a perfect square
    @Test
    public void testSqrtPerfectSquare() {
        double res = Math.sqrt(25);
        assertEquals(4, res, DELTA);
    }


}