public function testBuildUpdateLock()
{
$sourceDir = 'tests/data/apps/drupal/yaml';
self::$output->writeln("\nTesting build (with --lock) for directory: " . $sourceDir);
$projectRoot = $this->assertBuildSucceeds($sourceDir, ['lock' => true]);
$this->assertFileExists($projectRoot . '/project.make.yml.lock');
}