Django test runner not finding tests

I am new to both Python and Django and I'm learning by creating a diet management site but I've been completely defeated by getting my unit tests to run. All the docs and blogs I've found say that as long as it's discoverable from tests.py, tests.py is in the same folder as models.py and your test class subclasses TestCase, it should all get picked up automatically. This isn't working for me, when I run manage.py test <myapp> it doesn't find any tests.

I started with all my tests in their own package but have simplified it down to all tests just being in my tests.py file. The current tests.py looks like:

import unittest
from pyDietTracker.models import Weight
from pyDietTracker.weight.DisplayDataAdapters import DisplayWeight

class TestDisplayWeight(unittest.TestCase):

    def setUp(self):
        pass

    def tearDown(self):
        pass

    def testGetWeightInStone_KG_Correctly_Converted(self):
        weight = Weight()
        weight.weight = 99.8

        testAdapter = DisplayWeight(weight)
        self.assertEquals(testAdapter.GetWeightInStone(), '15 st 10 lb')   

I have tried it by subclassing the Django TestCase class as well but this didn't work either. I'm using Django 1.1.1, Python 2.6 and I'm running Snow Leopard.

I'm sure I am missing something very basic and obvious but I just can't work out what. Any ideas?

Edit: Just a quick update after a comment

INSTALLED_APPS = (
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.admin',
'pyDietTracker',
 )

To get the tests to run I am running manage.py test pyDietTracker

I had the same issue but my root cause was different.

I was getting Ran 0 tests, as OP.

But it turns out the test methods inside your test class must start with keyword test to run.

Example:

from django.test import TestCase


class FooTest(TestCase):
    def setUp(self):
        pass

    def tearDown(self):
        pass

    def this_wont_run(self):
        print 'Fail'

    def test_this_will(self):
        print 'Win'

Also the files with your TestCases in them have to start with test.

If you're using a yourapp/tests package/style for unittests, make sure there's a __init__.py in your tests folder (since that's what makes it a Python module!).

I can run test for specific apps e.g.

python project/manage.py test app_name

but when I run

python project/manage.py test

0 tests was found

Figure out I need to run this in the same directory as manage.py

so the solution would be, cd to project directory and run

python manage.py test

In my case, the app folder itself was missing an __init__.py. This results in the behaviour that the test will be run with python manage.py test project.app_name but not with python manage.py test.

project/
  app_name/
    __init__.py   # this was missing

This also happens if you have a syntax error in your tests.py.