public NewIssuesNotification newNewIssuesNotification(Map<String, UserDto> assigneesByUuid) {
    verifyAssigneesByUuid(assigneesByUuid);
    return new NewIssuesNotification(new DetailsSupplierImpl(assigneesByUuid));
  }
@Test
  public void newNewIssuesNotification_throws_NPE_if_assigneesByUuid_is_null() {
    assertThatThrownBy(() -> underTest.newNewIssuesNotification(null))
      .isInstanceOf(NullPointerException.class)
      .hasMessage("assigneesByUuid can't be null");
  }