@Test
public void get_active_sheets() throws Exception {

    OPCPackage container = OPCPackage.open(getClass().getResourceAsStream("000_DTA_DailyTimeLog.xlsm"));
    XSSFReader xssfReader = new XSSFReader(container);
    List<String> names = XlsUtils.getActiveSheetsFromWorkbookSpec(xssfReader.getWorkbookData());
    Assertions
            .assertThat(names)
            .isNotEmpty() //
            .containsExactly("MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY", "SATURDAY", "SUNDAY",
                    "WEEK SUMMARY");
}