RFC: syntax sugar for mocha tests calling multiple async functions

rfc.js

// Original code
it('does something complex', function(done) {
  async.waterfall(
    [
      function setupSchema(cb) {
        db.setupSchema(/*...*/, cb);
      },
      function createTestUser(cb) {
        db.createUser({ name: 'a user name' }, cb);
      }
      function act(data, cb) {
        this.data = data;
        db.users.edit(this.data.UserId, { name: 'new name' }, cb);
      },
      function assert(cb) {
        db.users.findById(this.data.userId, function(user) {
          expect(user.name).to.equal('new name');
          cb();
        }
      }
    ],
    done);
});

// Proposed API:
it('does something complex', [
  function setupSchema(cb) {
    db.setupSchema(/*...*/, cb);
  },
  function createTestUser(cb) {
    db.createUser({ name: 'a user name' }, cb);
  }
  function act(data, cb) {
    this.data = data;
    db.users.edit(this.data.UserId, { name: 'new name' }, cb);
  },
  function fetchNewData(cb) {
    db.users.findById(this.data.userId, cb);
  },
  function assert(user, cb) {
    expect(user.name).to.equal('new name');
    cb();
  }
]);

I have to agree that I'm on the "less magic" side, as @bajtos should know from my response to his email thread. That said, if you want to go down the "waterfall, building data as you go" model, let me shamelessly plug Stepdown: https://github.com/schoonology/stepdown . That's exactly what it does.