/** Two objects that are equal are required to return the same hashCode. */
public void testHashCode() {
StackedBarRenderer r1 = new StackedBarRenderer();
StackedBarRenderer r2 = new StackedBarRenderer();
assertTrue(r1.equals(r2));
int h1 = r1.hashCode();
int h2 = r2.hashCode();
assertEquals(h1, h2);
}
