Couldn't find any way to do this, but it would be really great to have some way to mark a test (assert) as expected to fail. That way you can leave the test in and have a note that the test failed, but doesn't cause the entire test run to be marked as a failure. And then, if it gets fixed some day, you'll get notified that the test was expected to fail but doesn't anymore.
I suppose I could do this manually by looking at the failed tests after the run, but having that built in would be great.