assertEquals(relation.getElement1(), cloned.getElement1());
assertEquals(relation.getElement2(), cloned.getElement2());
assertEquals(relation.canSetElement1Navigability(),
cloned.canSetElement1Navigability());
assertEquals(relation.canSetElement2Navigability(),
cloned.canSetElement2Navigability());
assertEquals(relation.isNavigableToElement1(),
cloned.isNavigableToElement1());
assertEquals(relation.isNavigableToElement2(),
cloned.isNavigableToElement2());
}