@Test
public void testPrint_Full() {

    DataFrameTabularPrintWorker w = new DataFrameTabularPrintWorker(new StringBuilder(), 5, 10);
    assertEquals(System.lineSeparator() +
            "col1  column2" + System.lineSeparator() +
            "----- -------" + System.lineSeparator() +
            "one         1" + System.lineSeparator() +
            "two         2" + System.lineSeparator() +
            "three       3" + System.lineSeparator() +
            "four        4" + System.lineSeparator() +
            "4 rows x 2 columns", w.print(df).toString());
}