@Test
public void addBlankColumn() {

    DataTable dt = new DataTable(1);
    dt.addRow("H1", "H2", "H3");
    dt.addRow("A1", "A2", "A3");
    
    dt.addBlankColumn(1);
    assertThat(dt.getRow(0), is(Arrays.asList("H1", "", "H2", "H3")));
    assertThat(dt.getRow(1), is(Arrays.asList("A1", "", "A2", "A3")));
}