* bzrlib/tests/test_conflicts.py: (TestParametrizedResolveConflicts): Add a docstring. (TestResolvePathConflictBefore531967.assertPathConflict): Really inject the old fashioned conflict object.
* bzrlib/merge.py: (Merge3Merger._merge_names): Better explain why we shouldn't generate helpers at this point. (Merge3Merger.cook_conflicts): Be more verbose when failing.
* bzrlib/conflicts.py: (PathConflict._resolve): Be more verbose when failing.