### Question:
CollisionGroup extends NameableAbstract { public Collection<CollisionFormula> getFormulas() { return Collections.unmodifiableCollection(formulas); } CollisionGroup(String name, Collection<CollisionFormula> formulas); static boolean same(String groupA, String groupB); Collection<CollisionFormula> getFormulas(); @Override String toString();  }### Answer:
@Test void testGroup() { assertEquals("group", group.getName()); assertEquals(formula, group.getFormulas().iterator().next()); }