* <b>The equals method is transitive:</b> for any reference values x, y,
* and z, if x.equals(y) returns true and y.equals(z) returns true, then
* x.equals(z) should return true.
*/
public void testOperationEqualsTransivity() {
IOperation x = new Operation();
IOperation y = new Operation();
IOperation z = new Operation();
assertTrue(x.equals(y) && y.equals(z) && x.equals(z));
}