public function testShowColumns()
{
$this->engine->showColumns('id');
$this->assertEquals(array('id'), $this->engine->getOrder());
$this->engine->showColumns('name', 'email');
$this->assertEquals(array('id', 'name', 'email'), $this->engine->getOrder());
$this->engine->showColumns(array('foo', 'bar'));
$this->assertEquals(array('id', 'name', 'email', 'foo', 'bar'), $this->engine->getOrder());
}
