message: add check for the empty case
diff: @@ -23,4 +23,9 @@ suite(`${isValidDownload.name}`, () => {
  let result = await isValidDownload(sampleBuffer, validIntegrity, new EventStream());
  expect(result).to.be.true;
  });
  +
  + test('Returns true if no integrity has been specified', async () => {
  + let result = await isValidDownload(sampleBuffer, undefined, new EventStream());
  + expect(result).to.be.true;
  + });
  });
  \ No newline at end of file
  