public function testSaveRootPackageFile()
{
$baseConfig = new Config();
$packageFile = new RootPackageFile(null, '/path', $baseConfig);
$this->serializer->expects($this->once())->method('serializeRootPackageFile')->with($packageFile)->willReturn('SERIALIZED');
$this->backend->expects($this->once())->method('write')->with('/path', 'SERIALIZED');
$this->storage->saveRootPackageFile($packageFile);
}
