public void testIsCloseTo() {
Constraint p = new IsCloseTo(1.0, 0.5);
assertTrue(p.eval(new Double(1.0)));
assertTrue(p.eval(new Double(0.5)));
assertTrue(p.eval(new Double(1.5)));
assertTrue(p.eval(new Float(1.0)));
assertTrue(p.eval(new Integer(1)));
assertTrue("number too large", !p.eval(new Double(2.0)));