public NewIssuesNotification newNewIssuesNotification(Map<String, UserDto> assigneesByUuid) {
    verifyAssigneesByUuid(assigneesByUuid);
    return new NewIssuesNotification(new DetailsSupplierImpl(assigneesByUuid));
  }
@Test
  public void newNewIssuesNotification_DetailsSupplier_getUserNameByUuid_returns_empty_if_user_has_null_name() {
    UserDto user = UserTesting.newUserDto().setLogin("user_noname").setName(null);

    NewIssuesNotification underTest = this.underTest.newNewIssuesNotification(ImmutableMap.of(user.getUuid(), user));

    DetailsSupplier detailsSupplier = readDetailsSupplier(underTest);
    assertThat(detailsSupplier.getUserNameByUuid(user.getUuid())).isEmpty();
  }