public void addHeader(String... headerColumnNames) {
    _headerColumnNames = headerColumnNames;
  }
@Test(priority = 2)
  public void testAddHeader() {
    // Run the test
    String initalTable = _textTableUnderTest.toString();
    _textTableUnderTest.addHeader("header1");
    String finalTable = _textTableUnderTest.toString();

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