public Task <IEnumerable <IFile> > GetFilesAsync()
{
IEnumerable <KeyValuePair <string, string> > filesInDir
= _filesContainer.Where(file => file.Key.StartsWith(Name));
return(Task.FromResult <IEnumerable <IFile> >(filesInDir.Select(file => new FileMock(file.Key, _filesContainer))));
}