public void TestAddNew() { XSSFWorkbook wb = new XSSFWorkbook(); XSSFSheet s = wb.CreateSheet() as XSSFSheet; Assert.AreEqual(null, wb.GetTheme()); StylesTable styles = wb.GetStylesSource(); Assert.AreEqual(null, styles.GetTheme()); styles.EnsureThemesTable(); Assert.IsNotNull(styles.GetTheme()); Assert.IsNotNull(wb.GetTheme()); wb = XSSFTestDataSamples.WriteOutAndReadBack(wb) as XSSFWorkbook; styles = wb.GetStylesSource(); Assert.IsNotNull(styles.GetTheme()); Assert.IsNotNull(wb.GetTheme()); }