@Test
public void weightedFriendRecommendation() throws Exception {
deleteSocialGraph();
Person a = personRepository.createPerson("a");
Person b = personRepository.createPerson("b");
Person c = personRepository.createPerson("c");
Person d = personRepository.createPerson("d");
Person e = personRepository.createPerson("e");
Person f = personRepository.createPerson("f");
// A is friends with B,C and D
a.addFriend(b);
a.addFriend(c);
a.addFriend(d);
// E is only friend with B
e.addFriend(b);
// F is friend with B, C, D
f.addFriend(b);
f.addFriend(c);
f.addFriend(d);
ArrayList<Person> recommendations =
fromIterableToArrayList(a.getFriendRecommendation(2).iterator());
// Recommend F to A
assertThat(recommendations.get(0), equalTo(f));
// Recommend E to A
assertThat(recommendations.get(1), equalTo(e));
}
private static void setupFriendsBetweenPeople(int maxNrOfFriendsEach) {
for (Person person : personRepository.getAllPersons()) {
int nrOfFriends = r.nextInt(maxNrOfFriendsEach) + 1;
for (int j = 0; j < nrOfFriends; j++) {
person.addFriend(getRandomPerson());
}
}
}
@Test
public void singleFriendRecommendation() throws Exception {
deleteSocialGraph();
Person a = personRepository.createPerson("a");
Person b = personRepository.createPerson("b");
Person c = personRepository.createPerson("c");
Person d = personRepository.createPerson("d");
Person e = personRepository.createPerson("e");
// A is friends with B,C and D
a.addFriend(b);
a.addFriend(c);
a.addFriend(d);
// E is also friend with B, C and D
e.addFriend(b);
e.addFriend(c);
e.addFriend(d);
Person recommendation = IteratorUtil.single(a.getFriendRecommendation(1).iterator());
assertThat(recommendation, equalTo(e));
}
@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));
}
@Test
public void getPathBetweenFriends() throws Exception {
deleteSocialGraph();
Person start = personRepository.createPerson("start");
start.setLongTermCtx(LongTermCtxTypes.WORK, "company");
Person middleMan1 = personRepository.createPerson("middle1");
middleMan1.setLongTermCtx(LongTermCtxTypes.WORK, "company");
Person middleMan2 = personRepository.createPerson("middle2");
middleMan2.setLongTermCtx(LongTermCtxTypes.WORK, "company");
Person endMan = personRepository.createPerson("endMan");
endMan.setLongTermCtx(LongTermCtxTypes.WORK, "company");
// Start -> middleMan1 -> middleMan2 -> endMan
start.addFriend(middleMan1);
middleMan1.addFriend(middleMan2);
middleMan2.addFriend(endMan);
Iterable<Person> path = start.getShortestPathTo(endMan, 4);
assertPathIs(path, start, middleMan1, middleMan2, endMan);
// assertThat( path, matchesPathByProperty(Person.NAME, "start", "middle1", "middle2",
// "endMan"));
}
