dart pub test... can you exclude files / directories?

dart/pub v1.10

I have a test/e2e folder that has webdriver.dart tests. 'pub run test' is trying to run the dart files in e2e.

pubspec.yaml
dev_dependencies:
    test: '>=0.12.1 <0.13.0'

I've been running the webdriver.dart test as

dart test/e2e/some_test.dart

Was hoping pub/test implemented a transformer... so I just just exclude it in pubspec.yaml. No joy.

Ideas? (besides moving the directory out from under test :-))