The Why and How of Automated Testing with Python and Django

The Why and How of Automated Testing with Python and Django Jim Purbrick BrightonPy 26th October 2010

Who Am I? Technical Director at Linden Lab Setup Linden Lab Brighton Software Engineer Musician Freelancer Entrepreneur

That’s No Moon... 35,000 CPU Cores Weekly Releases No Downtime 1.5 MLOC 100 Engineers 10 Years Image: jurvetson C++, Python, Perl, PHP, C#...

This Is Different... Image: xkcd.com

...Or Is It? } django } python proxy { } wsgi cache { } httpd (no)sql { } linux } browser network { Image: carlsjacques

Run Fast, Localise Errors } system tests } integration tests } unit tests Image: gothick_matt

Process TDD CI Deploy

Unit Tests from django.http import HttpResponseNotAllowed def allow(verb): def decorator(target): def wrapper(*args, **kwargs): if args[0].method != verb: return HttpResponseNotAllowed([verb]) return target(*args, **kwargs) return wrapper return decorator

import unittest import http @http.allow('GET') def _test_function(request): return class TestRequest: def __init__(self, method): self.method = method class testAllowDecorator(unittest.TestCase): def testGetReturnsNone(self): self.assertIsNone(_test_function(TestRequest('GET'))) def testPostReturns405AllowsGet(self): respose = _test_function(TestRequest('POST')) self.failUnlessEqual(response.status, 405) self.assertEquals(response['Allow'], 'GET') if __name__ == '__main__': unittest.main()

Integration Tests class LoggedInTestCase(LoggedInTestCase): urls = 'test_urls' fixtures = ['test_data.json'] def testActivityGetMethod200(self): client = self.createLoggedInClient() response = client.get('/activity/1/') self.failUnlessEqual(response.status_code, 200) def testActivityInvalidId404(self): client = self.createLoggedInClient() response = client.get('/activity/100000/') self.failUnlessEqual(response.status_code, 404) def testActivityPostMethodGetAllowed(self): client = self.createLoggedInClient() response = client.post('/activity/1/') self.failUnlessEqual(response.status_code, 405) self.assertEquals(response['Allow'], 'GET')

System Tests from selenium import selenium import unittest class qunitTest(unittest.TestCase): def setUp(self): self.verificationErrors = [] self.selenium = selenium("localhost", 4444, "*chrome", "http://example.com/undo/") self.selenium.start() def testQunitTest(self): sel = self.selenium sel.open("/qunit/drawarr/undo/") sel.wait_for_page_to_load("10000") self.failUnless(sel.is_text_present("0 failed")) def tearDown(self): self.selenium.stop() self.assertEqual([], self.verificationErrors)

Deployment def production(): env.hosts = ['production.com'] def ci(): env.hosts = ['localhost'] def setup(): require('hosts', provided_by=[production,ci]) sudo('aptitude install -y python-setuptools') sudo('easy_install pip') sudo('pip install virtualenv') sudo('aptitude install -y apache2') sudo('aptitude install -y libapache2-mod-wsgi')

def deploy(): require('hosts', provided_by=[production,ci]) import time env.release = time.strftime('%Y%m%d%H%M%S') upload_tar_from_hg() install_requirements() install_site() create_settings_local() symlink_current_release() migrate() restart_webserver() def install_requirements(): require('release', provided_by=[deploy, setup]) run('cd %s; pip install -E . -r ./releases/%s/requirements.txt' % (env.path, env.release)) def migrate(): require('project_name') run('python manage.py syncdb --noinput' % (env.path, env.project_name)) run('manage.py migrate' % (env.path, env.project_name))

CI #!/bin/bash export WORKON_HOME=~/.virtualenvs source /usr/local/bin/virtualenvwrapper.sh if ! workon env then mkvirtualenv env fi set -x set -e fab install_requirements_local echo "from settings_development import *" > settings_local.py fab test

#!/bin/bash # Start tracing and set exit on failure. set -x set -e # Deploy to ci environment # (pipe password in to sudo during deploy) echo "ci" | fab ci deploy # Add selenium python driver to python path. export PYTHONPATH=/usr/lib/selenium-python-client-driver-1.0.1:$ {PYTHONPATH} # Run python selenium tests via selenium-rc. python selenium/test.py python selenium/text/test.py python selenium/undo/test.py

What’s Left? 1. Multiple Browsers/Platforms 2. Image Capture 3. Performance Tests 4. CD 5. Monitoring

Thank You! http://jimpurbrick.com http://18dex.com

http://brightonpy.org	58
http://harajuku-tech.posterous.com	39
http://lanyrd.com	33
http://note.harajuku-tech.org	7

The Why and How of Automated Testing with Python and Django

by Jim Purbrick on Nov 04, 2010

Accessibility

Categories

Tags

Upload Details

Usage Rights

4 Embeds 137

Statistics

The Why and How of Automated Testing with Python and Django — Presentation Transcript