public function testExecute()
{
$application = $this->getApplication();
$application->add(new DumpCommand());
$command = $this->getApplication()->find('config:dump');
$commandTester = new CommandTester($command);
$commandTester->execute(array('command' => $command->getName(), 'xpath' => 'global/install'));
$this->assertContains('date', $commandTester->getDisplay());
}