@Test
public void computeNewDirectionAfterAddingLink_shouldReturnSenderIncomingAndReceiverOutgoing_GivenSenderNoneAndReceiverNone() {

    Map<String, CommunicationService.Direction> expectedMap = new HashMap<>();
    expectedMap.put("1", CommunicationService.Direction.INCOMING);
    expectedMap.put("2", CommunicationService.Direction.OUTGOING);
    Assert.assertEquals(expectedMap, this.service.computeNewDirectionAfterAddingLink("1"
            , CommunicationService.Direction.NONE
            , "2"
            , CommunicationService.Direction.NONE));
}