public class FractionTest() { private Fraction f; @Test public void testLegalConstruction() { f = new Fraction (4, 7); assertEquals ("wrong num", 4, f.getNum()); assertEquals ("wrong den", 7, f.getDen()); @Test public void testIlegalConstruction() { f = new Fraction (3, 0); assertEquals ("wrong num", 3, f.getNum()); assertEquals ("wrong den", 1, f.getDen()); // Note the 1 }