Move a test to its test group
Move a test to its test group

Change was already made in internal version

dart-lang/dart-protobuf,dart-lang/protobuf,google/protobuf.dart,google/protobuf.dart,dart-lang/dart-protobuf,google/protobuf.dart,dart-lang/protobuf,dart-lang/dart-protobuf,dart-lang/protobuf