Small type in test database name
Small type in test database name

NOTE:
':memory;' should be ':memory:', I remove NAME as django will be
automatically use in-memory if there is no NAME specified.

[ci skip]

Eksmo/django-recommends,python-recsys/django-recommends,fcurella/django-recommends,fcurella/django-recommends,Eksmo/django-recommends,python-recsys/django-recommends