Add lots of new functions to key_name.py, including path/link_name processing. Copy various link_name related regex patterns to key_name.py and use them. Add error checking that raises a key_name.Error exception when name...() functions are given empty arguments. Hard-code class names, since they match what was typed into the module.class.__name__ to get the name anyway. This eliminates dependencies on any modules by key_name.py.

"""
39. Empty model tests

These test that things behave sensibly for the rare corner-case of a model with
no fields.
"""

from django.db import models

class Empty(models.Model):
    pass

__test__ = {'API_TESTS':"""
>>> m = Empty()
>>> m.id
>>> m.save()
>>> m2 = Empty()
>>> m2.save()
>>> len(Empty.objects.all())
2
>>> m.id is not None
True
>>> existing = Empty(m.id)
>>> existing.save()

"""}