public void testCloning() {
        DateTick t1 = new DateTick(
            new Date(0L), "Label", TextAnchor.CENTER, TextAnchor.CENTER, 10.0
        );
        DateTick t2 = null;
        try {
            t2 = (DateTick) t1.clone();
        }
        catch (CloneNotSupportedException e) {
            System.err.println("Failed to clone.");
        }
        assertTrue(t1 != t2);
        assertTrue(t1.getClass() == t2.getClass());
        assertTrue(t1.equals(t2));