Pretenders talk at PyconUK 2012
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This document introduces Pretenders, a tool for testing applications that rely on external network services. Pretenders allows setting up mock HTTP and SMTP servers to test how applications handle different response types from external APIs and services. It works by pre-programming responses, replaying them during tests, and verifying requests. Tests can point applications to Pretenders' mock servers instead of real services for integration testing without patching code. Pretenders runs mock servers separately from the main server for configuration and results collection. Sample client test code is shown to define presets, run an application using the mock, and verify requests.
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- 1. Pretenders (fake servers for testing) Don't GET (nor POST) me wrong Carles Barrob辿s - @technomilk
- 2. Motivation We want to test applications that rely on external network services. Are we sending the right stuff? Do we deal properly with different types of responses?
- 3. Main Use Cases HTTP: Applications that call external HTTP APIs AJAX client code SMTP: Applications that send e-mail
- 4. Design Decisions Preset/Replay/Verify mocking pattern Mock at the "wire protocol" level Simplicity of client test code Configuration and checks via a ReST API Usable in polyglot environments
- 5. Preset/Replay/Verify We pre-program our pretend server with pre- canned responses (presets) We let the test run, and the mock server replays the presets Finally, we verify what requests/data were sent to the server
- 6. Mock at wire protocol level Instead of "patch-style" mocking Usable for testing non-Python applications Usable in integration tests (where you cannot patch running code) Just make your application point to the mock server:port instead of the real service
- 7. How it all works together Start the main boss server (i.e. manually) Each time you create a Mock, it: Tells the boss to instantiate a new mock server (pretender) Returns the port of the new server Your mock acts as a proxy to the remote server for configuration and collection of results The boss takes care of cleaning up stale pretenders
- 8. Sample client test code from pretenders.http.client import HttpMock mock = HttpMock('localhost', 8000) #boss host and port # Define presets mock.when('GET /hello').reply('Hello') mock.when('(POST|PUT) /somewhere').reply(status=400) mock.reply('{"temperature": 23}', headers={'Content-Type': 'application/json'}) # Set your app to the fake URL, and exercise it set_service_url(mock.pretend_access_point) run stuff # Verify requests your code made r = mock.get_request(0) assert_equal(r.method, 'GET') assert_equal(r.url, '/weather?city=barcelona')
- 9. THANK YOU! Pretenders was written by: Alex Couper and Carles Barrob辿s $ pip install pretenders Docs: http://pretenders.readthedocs.org Code: https://github.com/txels/pretenders