问题
According to https://github.com/ReactiveX/rxjs/blob/master/doc/writing-marble-tests.md
'--(abc)-|': on frame 20, emit a, b, and c, then on frame 80 complete
So how do I represent "on frame 20, emit a, b, and c, then on frame 40 complete.
Ie how can I stop the sync group itself taking up frames?
回答1:
cartant has answered this question in his comment.
There's no way to do it - sync groups will always take up extra frames even though all members occur in the frame of the opening bracket.
来源：https://stackoverflow.com/questions/46839094/how-to-make-an-rxjs-marble-sync-grouping-only-take-up-one-frame