private async Task <IEnumerable <string> > LoadScriptsAsync(
            SourceFileParametrization fileParametrization,
            CancellationToken ct)
        {
            if (fileParametrization.FilePath != null)
            {
                var script = await _fileGateway.GetFileContentAsync(
                    fileParametrization.FilePath,
                    ct);

                return(new[] { script });
            }
            else if (fileParametrization.FolderPath != null)
            {
                var scripts = _fileGateway
                              .ChangeFolder(fileParametrization.FolderPath)
                              .GetFolderContentsAsync(fileParametrization.Extensions, ct);
                var contents = (await scripts.ToEnumerableAsync())
                               .Select(t => t.content);

                return(contents);
            }
            else
            {
                throw new InvalidOperationException("We should never get here");
            }
        }