manager.py

import unittest

from flask.ext.script import Manager, Server
from project import app, db

manager = Manager(app)

class Serve(Server):

    def handle(self, *args, **kwargs):
        db.init_app(app)
        super(Serve, self).handle(*args, **kwargs)

manager.add_command('runserver', Serve())

@manager.command
def tests():
    """Run the testsuite"""
    suite = unittest.TestLoader().loadTestsFromName('pbdb.tests')
    unittest.TextTestRunner(verbosity=2).run(suite)

tests.py

import unittest

from project import app, db

class AuthTestCase(unittest.TestCase):

    def setUp(self):
        self.db_name = 'testing'
        app.config['MONGODB_SETTINGS']['db'] = self.db_name
        app.config['TESTING'] = True
        db.init_app(app)

        self.app = app
        self.db = db