public MyNewIssuesNotification newMyNewIssuesNotification(Map<String, UserDto> assigneesByUuid) {
    verifyAssigneesByUuid(assigneesByUuid);
    return new MyNewIssuesNotification(new DetailsSupplierImpl(assigneesByUuid));
  }
@Test
  public void newMyNewIssuesNotification_DetailsSupplier_getUserNameByUuid_always_returns_empty_if_map_argument_is_empty() {
    MyNewIssuesNotification underTest = this.underTest.newMyNewIssuesNotification(emptyMap());

    DetailsSupplier detailsSupplier = readDetailsSupplier(underTest);
    assertThat(detailsSupplier.getUserNameByUuid("foo")).isEmpty();
  }