it.only('should return empty commitData on empty branch push', async () => {
  const emptyPackBuffer = createEmptyPackBuffer();

  const newCommit = 'b'.repeat(40);
  const ref = 'refs/heads/feature/emptybranch';
  const packetLine = `${EMPTY_COMMIT_HASH} ${newCommit} ${ref}\0capabilities\n`;

  req.body = Buffer.concat([createPacketLineBuffer([packetLine]), emptyPackBuffer]);

  const result = await exec(req, action);

  expect(result).to.equal(action);

  const step = action.steps.find(s => s.stepName === 'parsePackFile');
  expect(step).to.exist;
  expect(step.error).to.be.false; // <-- Fails here
  expect(action.branch).to.equal(ref);
  expect(action.setCommit.calledOnceWith(EMPTY_COMMIT_HASH, newCommit)).to.be.true;

  expect(action.commitData).to.be.an('array').with.lengthOf(0);
});