There are now lines like:
#TODO: remove this ugly hack - it is here because of the bug in bayeux
tap = "TAP version 13\n1..1\n%s" % check.export_TAP(self.cd)

in test_resultsdb_directive.py and test_check.py, because mcepl's Bayeux does not add these (required, by the standard's definition) lines. It IMHO makes more sense to put this directly into the check.py (and remove it from the tests), as this is nice, but the actual code won't work until the bayeux is fixed.