* @param harness the test harness (<code>null</code> not permitted).
*/
public void test(TestHarness harness)
{
Rectangle r = new Rectangle(0, 0, 0, 0);
r.grow(5, 7);
harness.check(r.x == -5);
harness.check(r.y == -7);
harness.check(r.width == 10);
harness.check(r.height == 14);
}