public function testColumns() {
		$command = new MockCommand(array('request' => $this->request));
		$expected = "data1\t\ndata2\t\n";
		$command->columns(array('col1' => 'data1', 'col2' => 'data2'));
		$result = $command->response->output;
		$this->assertEqual($expected, $result);
	}