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Test utility for asserting that your API outputs actually match your OpenAPI/Swagger specification.

Project description

This package provides a simple test-utility to test the integrity of your OpenAPI/Swagger documentation against actual API responses.

Package is currently under development, and only supports the testing of swagger documentation implemented in Django using drf_yasg. The ambition for release 1.0.0 is to expand the current features to support testing any openapi specification, and to cut the dependence on Django tooling.


Install using pip:

pip install openapi-tester

Add ‘openapi_tester’ to your INSTALLED_APPS setting in



The app currently requires two parameters.

Path: The path to your OpenAPI specification. Can be an url, or the path to your document.

Case: The case standard you wish to enforce for your documentation. Can be ‘camelcase’, ‘snakecase’, or None.

  • camelcase: Checks that your documentation is camelCased (default).
  • snakecase: Checks that your documentation is snake_cased.
  • None: Doesn’t check the documentation case standard.


    'PATH': '',
    'CASE': 'camelcase'


The OpenAPI tester should primarily be used to supplement your existing API tests.

The easiest way to implement it would be in a test where you’re successfully retrieving a valid response from an endpoint.

An example might look like this:

from django.contrib.auth.models import User
from rest_framework.test import APITestCase

from openapi_tester import validate_specification

class TestMyAPI(APITestCase):

    def setUp(self):
        user, _ = User.objects.update_or_create(username='test_user')
        self.path = '/api/v1/cars'

    def test_get_200(self):
        Verifies that a 200 is returned for a valid GET request to the /correct/ endpoint.
        response = self.client.get(self.path + '/correct' /, headers={'Content-Type': 'application/json'})
        expected_response = [
            {'name': 'Saab', 'color': 'Yellow', 'height': 'Medium', 'width': 'Very wide', 'length': '2 meters'},
            {'name': 'Volvo', 'color': 'Red', 'height': 'Medium', 'width': 'Not wide', 'length': '2 meters'},
            {'name': 'Tesla', 'color': 'black', 'height': 'Medium', 'width': 'Wide', 'length': '2 meters'},

        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.json(), expected_response)

        # Test Swagger documentation
        validate_specification(response, 'GET', self.path + '/correct/')

See the demo project and tests folder for more examples.

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