@Test
public void removingOneFriendIsHandledCleanly() {
Person person1 = personRepository.getPersonByName("person#1");
Person person2 = personRepository.getPersonByName("person#2");
person1.addFriend(person2);
int noOfFriends = person1.getNrOfFriends();
person1.removeFriend(person2);
int noOfFriendsAfterChange = person1.getNrOfFriends();
assertThat(noOfFriends, equalTo(noOfFriendsAfterChange + 1));
}
