https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20tool_tests_general/15533/overview It looks like the global variable here is causing some cross-test pollution: https://github.com/flutter/flutter/blob/master/packages/flutter_tools/lib/src/dart/language_version.dart#L20