### Question:
XlsxExportContactsFileCreatorService { public Workbook createFileForCompany(long companyId) throws IllegalAccessException { Collection<TeamMemberRow> teamMemberRows = teamMemberRowBuilderService.generateForCompany(companyId); Workbook workbook = genericXlsxFileCreatorService.createWorkbook(teamMemberRows, headlines, "okr-members"); logger.info("Created excel file with member information about company with ID: " + companyId); return workbook; } XlsxExportContactsFileCreatorService(
      TeamMemberRowBuilderService teamMemberRowBuilderService,
      GenericXlsxFileCreatorService<TeamMemberRow> genericXlsxFileCreatorService,
      Messages messages); Workbook createFileForOkrTeam(long departmentId); Workbook createFileForCompany(long companyId);  }### Answer:
@Test public void createFileForOkrTeam_shouldReturnExcelWithJustHeaderRowIfTeamMemberRowIsEmpty() throws IllegalAccessException { Workbook workbook = xlsxExportContactsFileCreatorService.createFileForCompany(companyId); Assert.assertEquals(this.workbook, workbook); verify(teamMemberRowBuilderService, times(1)).generateForCompany(companyId); }