public void addRow(String... columnValues) {
    _rows.add(columnValues);
  }
@Test(priority = 2)
  public void testAddRow() {
    // Run the test
    String initalTable = _textTableUnderTest.toString();
    _textTableUnderTest.addRow("row1");
    String finalTable = _textTableUnderTest.toString();

    // Verify the results
    assertEquals("", initalTable);
    assertNotEquals("", finalTable);
  }