763988d7f4
Modernize setlet and maplet unit tests. Change-Id: I8508e9e48dc80e1a00b984c7ac82e1d57278ad6e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/212872 Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Stephen Adams <sra@google.com>