public function testExecute()
{
$application = $this->getApplication();
$application->add(new ListCommand());
$command = $this->getApplication()->find('admin:user:list');
$commandTester = new CommandTester($command);
$commandTester->execute(array('command' => $command->getName()));
$this->assertContains('id', $commandTester->getDisplay());
$this->assertContains('user', $commandTester->getDisplay());
$this->assertContains('email', $commandTester->getDisplay());
$this->assertContains('status', $commandTester->getDisplay());
}