Should avoid test failures triggering spurious infra failures.
TEST=ci
Change-Id: Iece312aa7eba814d7a740b0db16505d480cd3808
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/291582
Reviewed-by: Alexander Thomas <athom@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>