public function testAddColumn()
{
$this->table->addColumn('foo');
$this->assertEquals(1, $this->table->countColumns());
$this->table->addColumn('foo1', 'foo2');
$this->assertEquals(3, $this->table->countColumns());
$this->table->addColumn(array('foo3', 'foo4'));
$this->assertEquals(5, $this->table->countColumns());
}