Object.values(summaries).forEach(summary => {
        summary.additions = 0;
        summary.deletions = 0;

        summary.files.forEach(file => {
            let fileMetadata = metadataFor(fileMetadatas, file);
            summary.additions += fileMetadata.additions;
            summary.deletions += fileMetadata.deletions;
            totalAdditions += fileMetadata.additions;