message: Reverse  error case
diff: @@ -27,14 +27,14 @@ export class BlobManager implements IBlobManager {
  public async getBlob(sha: string): Promise<IGenericBlob> {
  - if (this.blobs.has(sha)) {
  + if (!this.blobs.has(sha)) {
  + Promise.reject("Blob does not exist");
  + }
  const blob = this.blobs.get(sha);
  const blobContent = await this.storage.read(sha);
  blob.content = new Buffer(blobContent, "base64");
  return blob;
  }
  - Promise.reject("Blob does not exist");
  - }
  public async addBlob(blob: IGenericBlob): Promise<void> {
  this.blobs.set(blob.sha, blob);
  