Refactor PostfixCompletionTest to make invalid tests positive. A clean up before https://dart-review.googlesource.com/c/sdk/+/71620 R=brianwilkerson@google.com Change-Id: I475d1eab3bb5a54a2035a7b8940c101f662e53a0 Reviewed-on: https://dart-review.googlesource.com/71660 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
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