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Utilities for testing Flask applications with WebTest.

Project description

Flask-WebTest provides a set of utilities to ease testing Flask applications with WebTest.

flask.ext.webtest.TestApp extends webtest.TestApp by adding few useful fields to response:

  • response.templates ― dictionary containing information about what templates were used to build the response and what their contexts were. The keys are template names and the values are template contexts. If only one template was used, it’s name and context can be accessed through response.template and response.context.

  • response.flashes ― list of tuples (category, message) containing messages that were flashed during request.

    Note: Fully supported only starting with Flask 0.10 (which is not released at the time of writing). If you use previous version, response.flashes will contain only those messages that was consumed by get_flashed_messages() template calls.

  • response.session ― dictionary containing session data.


pip install flask-webtest


from unittest import TestCase
from flask.ext.webtest import TestApp
from main import app

class ExampleTest(TestCase):
    def setUp(self): = app
        self.w = TestApp(  # Or

    def test(self):
        r = self.w.get('/')
        self.assertEqual(r.context['text'], 'Hello!')
        self.assertEqual(r.template, 'template.html')
        self.assertNotIn('user_id', r.session)

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