Bots not running all platforms as specified in test_config file

[jakemac53]

I had a .test_config which looked like:

{
  "test_package": {
    "platforms": ["vm", "dartium"]
  }
}

And got the following output:

@@@BUILD_STEP pub run test@@@
Enter directory =  xcodebuild/ReleaseIA32/package_copy/polymer
Running: /Volumes/data/b/build/slave/packages-mac-polymer-dart/build/dart/xcodebuild/ReleaseIA32/dart-sdk/bin/pub run test --reporter expanded --no-color --platform vm
env: {'VERSIONER_PYTHON_PREFER_32_BIT': 'no', 'BUILDBOT_BUILDERNAME': 'packages-mac-polymer-dart', 'LOGNAME': 'chrome-bot', 'USER': 'chrome-bot', 'HOME': '/Users/chrome-bot', 'BOTO_CONFIG': '/Volumes/data/b/build/site_config/.boto', 'PATH': '/Users/chrome-bot/slavebin:/Volumes/data/b/depot_tools:/usr/local/git/bin:/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin', 'BUILDBOT_BUILDBOTURL': 'None', 'BUILDBOT_BLAMELIST': "[u'[email protected]']", 'TERM': 'nocolor', 'SHELL': '/bin/bash', 'VERSIONER_PYTHON_VERSION': '2.7', 'BUILDBOT_MASTERNAME': 'client.dart.packages', 'BUILDBOT_GOT_REVISION': '154', 'PYTHONPATH': '/Volumes/data/b/build/site_config:/Volumes/data/b/build/scripts:/Volumes/data/b/build/scripts/release:/Volumes/data/b/build/third_party:/Volumes/data/b/build/third_party/requests_1_2_3:/Volumes/data/b/build_internal/site_config:/Volumes/data/b/build_internal/symsrc:/Volumes/data/b/build/slave:/Volumes/data/b/build/third_party/buildbot_slave_8_4:/Volumes/data/b/build/third_party/twisted_10_2:', 'SSH_AUTH_SOCK': '/tmp/launch-nov2bR/Listeners', 'BUILDBOT_SCHEDULER': 'polymer-master', 'BUILDBOT_REVISION': '922d38fd13170df32aab9ba2629f0e3d0b288102', 'AWS_CREDENTIAL_FILE': '/Volumes/data/b/build/site_config/.boto', 'CHROME_HEADLESS': '1', 'BUILDBOT_ANNOTATED_STEPS_RUN': '1', 'BUILDBOT_BRANCH': 'master', 'BUILDBOT_BUILDNUMBER': '696', 'PUB_CACHE': '/Volumes/data/b/build/slave/packages-mac-polymer-dart/build/dart/xcodebuild/ReleaseIA32/pub_cache', '__CF_USER_TEXT_ENCODING': '0x1F6:0:0', 'PWD': '/Volumes/data/b/build/slave/packages-mac-polymer-dart/build/dart', 'BUILDBOT_SLAVENAME': 'vm653-m3', 'BUILDBOT_CLOBBER': '', 'PAGER': 'cat'}
No tests ran.
Enter directory =  /Volumes/data/b/build/slave/packages-mac-polymer-dart/build/dart

It looks like it only ran the vm test and not the dartium one? It is true that the package actually has no vm tests, so maybe that is the issue, but it still seems like a bug?