This test confirms that the NNBD mode predicates are consistent with
equivalent dynamic tests.
Change-Id: Ifeb2b9a14144ce3bee10580c80fd4a1aeea43c32
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/148581
Reviewed-by: Stephen Adams <sra@google.com>
Commit-Queue: Mayank Patke <fishythefish@google.com>