@Test
public void clear() {

  exporter = new CsvExporter(2, "foo", "bar");
  exporter.addRow("hello", "world");
  assertEquals("hello", exporter.getTable().get(1, 0));
  assertEquals("world", exporter.getTable().get(1, 1));
  exporter.clear();
  assertNull(exporter.getTable().get(1, 0));
  assertNull(exporter.getTable().get(1, 1));
  assertTrue(exporter.getTable().row(1).isEmpty());
  assertEquals(1, exporter.getTable().rowKeySet().size());
}