@Test
public void get_ColumnsNumber() throws Exception {

    Assertions
            .assertThat(XlsUtils.getColumnsNumber(getClass().getResourceAsStream("data_xls.xml"))) //
            .isEqualTo(33);
    Assertions
            .assertThat(XlsUtils.getColumnsNumber(getClass().getResourceAsStream("simple_data.xml"))) //
            .isEqualTo(4);
    Assertions
            .assertThat(XlsUtils.getColumnsNumber(getClass().getResourceAsStream("TDP-1781.xml"))) //
            .isEqualTo(6);
}