public void testEquals() {
        YInterval i1 = new YInterval(1.0, 0.5, 1.5);
        YInterval i2 = new YInterval(1.0, 0.5, 1.5);
        assertEquals(i1, i2);
        
        i1 = new YInterval(1.1, 0.5, 1.5);
        assertFalse(i1.equals(i2));
        i2 = new YInterval(1.1, 0.5, 1.5);
        assertTrue(i1.equals(i2));

        i1 = new YInterval(1.1, 0.55, 1.5);
        assertFalse(i1.equals(i2));
        i2 = new YInterval(1.1, 0.55, 1.5);
        assertTrue(i1.equals(i2));
    
        i1 = new YInterval(1.1, 0.55, 1.55);
        assertFalse(i1.equals(i2));
        i2 = new YInterval(1.1, 0.55, 1.55);
        assertTrue(i1.equals(i2));