public void Update_EmptyDirectory_ShouldFetchFileAndUpdateIt()
{
_fileProvider.GetDirectoryContents(Arg.Any <string>()).Returns(Substitute.For <IDirectoryContents>());
_remoteFileSizeFetcherGateway.GetFileContent(Arg.Any <string>()).Returns(new RemoteFileFetcherGatewayResponse());
_remoteFileSizeFetcherGateway.GetFileContent(Arg.Is <string>(x => x.EndsWith("txt"))).Returns(new RemoteFileFetcherGatewayResponse {
Content = Encoding.UTF8.GetBytes("a=b")
});
_fetcher.Update().Wait();
_processHelper.Received(3).Start(Arg.Any <string>(), Arg.Any <string>(), Arg.Any <string>());
}
