9d043ce763
These tests became flaky after 3786c5e5ee
landed as DDS initialization became faster, making it more likely that
an isolate used in the test was not yet runnable.
Partly fixes https://github.com/dart-lang/sdk/issues/55133
Change-Id: Ic919cfa6c8bf2b8274efecfa2a78bc056f7e181e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/356340
Commit-Queue: Ben Konyi <bkonyi@google.com>
Reviewed-by: Derek Xu <derekx@google.com>