manage.py test app can't find tests

Using Python 2.7 and Django trunk I can run

python tests.py

successfully in the app directory or in /app/tests subdirectory where it
says (no setup or teardown required yet)

.........................
----------------------------------------------------------------------
Ran 25 tests in 0.141s

OK

but in the project directory can someone tell me why this runs zero tests?

python manage.py test app

says

Creating test database for alias 'default'...

----------------------------------------------------------------------
Ran 0 tests in 0.000s

OK
Destroying test database for alias 'default'...

Maybe there are no database related tests just yet????

On the other hand broadening the scope seems to run a whole mess of
contrib app tests.

python manage.py test

says

Creating test database for alias 'default'...
.............................................................................s............
..........................................................................................
..........................................................................................
........................................................
----------------------------------------------------------------------
Ran 326 tests in 33.157s

OK (skipped=1)
Destroying test database for alias 'default'...

My settings.py says in part ...

INSTALLED_APPS = (
'django.contrib.auth',
'django.contrib.contenttypes', # keeps track of labels and tables
'django.contrib.sessions', # keys, values, expiry
'django.contrib.sites', # for connecting content to 'a' site
'django.contrib.messages',
'django.contrib.admin',
'django.contrib.admindocs',
'django.contrib.staticfiles',
'django.contrib.comments',
'commoninfo',
'ldap_groups', # Novell login for auth
'app',
)

Thanks for any hints

Mike

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