python - Test Suite in Flask with MongoEngine -

i have small app in flask want accompany tests. have used django tests before, , i'm getting grips lower level functionality in flask.

my tests this:

import unittest config import app mongoengine import connect my_app.models import user  class testcase(unittest.testcase):      def setup(self):         app.config['testing'] = true         app.config["mongodb_db"] = 'xxx'         connect(             'xxx',             username='heroku',             password='xxx',             host='xxx',             port=xxx         )         self.app = app.test_client()      def teardown(self):         pass      def test_create_user(self):         u = user(username='john', email='john@example.com')         u.save() 

i know wrong, because test passes have added entry database. how should test creation of user without polluting database? had assumed app.config['testing'] had significance here.

any appreciated.

there 2 approaches know of:

1. separate test database

this django automatically unittesting. uses separate database testing clears before , after every test run. implement manually.

2. use mocking avoid using database

this more preferred method situations. use mocking simulate various functions tests don't create/edit/delete information in real database. better multiple reasons, notably performance/speed of unit tests.