public function testExecute()
{
$command = new HelpCommand();
$commandTester = new CommandTester($command);
$command->setCommand(new ListCommand());
$commandTester->execute(array());
$this->assertRegExp('/list \\[--xml\\] \\[--raw\\] \\[namespace\\]/', $commandTester->getDisplay(), '->execute() returns a text help for the given command');
$command->setCommand(new ListCommand());
$commandTester->execute(array('--xml' => true));
$this->assertRegExp('/<command/', $commandTester->getDisplay(), '->execute() returns an XML help text if --xml is passed');
$application = new Application();
$commandTester = new CommandTester($application->get('help'));
$commandTester->execute(array('command_name' => 'list'));
$this->assertRegExp('/list \\[--xml\\] \\[--raw\\] \\[namespace\\]/', $commandTester->getDisplay(), '->execute() returns a text help for the given command');
$commandTester->execute(array('command_name' => 'list', '--xml' => true));
$this->assertRegExp('/<command/', $commandTester->getDisplay(), '->execute() returns an XML help text if --xml is passed');
}