private function getTestSuite(InputInterface $input)
{
$testsuite = $input->getArgument('testsuite');
if (!empty($testsuite) && !in_array($testsuite, $this->allowedTestSuites)) {
throw new \InvalidArgumentException('Test suite argument is wrong, use one of following: ' . implode(', ', $this->allowedTestSuites));
}
return $testsuite;
}