Fonction testToString BRUGIER

@Test
    public void testToString() {

        Rational r1 = new Rational(3,5);
        Rational r2 = new Rational(30,50);
        Rational r3 = new Rational(5);

        assertEquals("3/5",r1.toString());
        assertEquals("3/5",r2.toString());
        assertEquals("5/1",r3.toString());
    }