Demo: A simple test for addition

import junit.framework.TestCase;

public class FractionTest extends TestCase {

    public void testAddition() {
      
        Fraction half = new Fraction(1, 2);
        Fraction fourth = new Fraction(1, 4);
        
        Fraction actual = half.add(fourth);
        Fraction expected = new Fraction(3, 4);
        assertEquals(expected, actual);
        
    }
    
}