List<Communication> result = instance.getList();
assertFalse("The list must not be empty",
result.isEmpty());
assertFalse("The list must contain only one item",
result.size() > 1);
Communication retrievedCom = result.get(0);
assertEquals(completedWithContact, retrievedCom);
List<Contact> participants = retrievedCom.getParticipants();
assertEquals("The list of participants must have one contact",
1, participants.size());
assertEquals("The list of participants must contain only the created contact",
contact, participants.get(0));
}