public void testHashCode() {
        ModuloAxis a1 = new ModuloAxis("Test", new Range(0.0, 1.0));
        ModuloAxis a2 = new ModuloAxis("Test", new Range(0.0, 1.0));
        assertTrue(a1.equals(a2));
        int h1 = a1.hashCode();
        int h2 = a2.hashCode();
        assertEquals(h1, h2);