Use fake_async over waiting for timers with delays (dart-lang/stream_transform#166)

On the web the timers may have some variance.
Replace all usages of `waitForTimer` utility to use `fakeAsync`.
Separate out the call to `Stream.listen` from `setUp` so it
happens in the fake async zone.
5 files changed
tree: 369647b86e7d2ba14eb462318a4e3f89593cffc1
  1. pkgs/