More than a side salad: behaviour driven testing and test driven design in Django with Lettuce
5 likes5,379 views
This document discusses behavior-driven development (BDD) and test-driven development (TDD) using Lettuce for Django projects. It explains that with TDD, tests are written before code to define desired behaviors. Lettuce allows writing tests to validate user behaviors and scenarios without knowing the code. Steps provide a way to make test code reusable and stateful. Features describe application behaviors as scenarios and examples. Lettuce integrates with Django and Selenium for browser testing. Best practices include writing reusable steps and scenarios, tying features to single stories, and including scenarios and anti-scenarios.
![from lettuce import step, world
@step(r'I get the resource "([^"]*)"')
def get_resource(step, url):
"""
Make a GET request to the given URL
"""
world.response = world.client.get(url)](https://image.slidesharecdn.com/morethanasidesaladbehaviourdriventestingandtestdrivendesignindjangowithlettuce-130912072655-phpapp02/85/More-than-a-side-salad-behaviour-driven-testing-and-test-driven-design-in-Django-with-Lettuce-15-320.jpg)
![from django.test.client import Client
from lettuce import before, step, world
from nose.tools import assert_equals
@before.each_scenario
def set_default_client(scenario):
world.client = Client()
@step(r'I get the resource "([^"]*)"')
def get_resource(step, url):
world.response = world.client.get(url)
@step(r'I get the response code (d+)')
def check_response_code(step, code):
code = int(code)
assert_equals(world.response.status_code, code)](https://image.slidesharecdn.com/morethanasidesaladbehaviourdriventestingandtestdrivendesignindjangowithlettuce-130912072655-phpapp02/85/More-than-a-side-salad-behaviour-driven-testing-and-test-driven-design-in-Django-with-Lettuce-17-320.jpg)
More than a side salad: behaviour driven testing and test driven design in Django with Lettuce
- 1. more than a side salad: behaviour driven testing and test driven design in Django with Lettuce Danielle Madeley blogs.gnome.org/danni dannipenguin
- 2. Just what is test driven development?
- 6. But how do we write tests when we don't know what the code looks like?
- 7. Don't test code; test behaviours
- 9. As a visitor to the site I want to create an account using my Google login So that I can log in without needing another password
- 10. GivenI have a valid Google account WhenI visit the siteAnd I click create account ThenI am redirected to Google http://www.flickr.com/photos/27369469@N08/2660160225
- 12. Feature: Authenticate to API As a searcher/API user I want to authenticate to the API So that I can make queries Scenario: I am not authenticated to the API When I get the resource "/api/v3/hello/" Then I get the response code 401
- 15. from lettuce import step, world @step(r'I get the resource "([^"]*)"') def get_resource(step, url): """ Make a GET request to the given URL """ world.response = world.client.get(url)
- 17. from django.test.client import Client from lettuce import before, step, world from nose.tools import assert_equals @before.each_scenario def set_default_client(scenario): world.client = Client() @step(r'I get the resource "([^"]*)"') def get_resource(step, url): world.response = world.client.get(url) @step(r'I get the response code (d+)') def check_response_code(step, code): code = int(code) assert_equals(world.response.status_code, code)
- 19. # settings.py INSTALLED_APPS = ( ... 'lettuce.django', 'myapp', ) LETTUCE_APPS = ( 'myapp', ) LETTUCE_USE_TEST_DATABASE = True
- 21. from lettuce import before, world # import external lettuce steps import lettuce_webdriver.webdriver @before.all def set_browser(): """ Create a browser instance for use in tests. """ world.browser = webdriver.PhantomJS(...) world.browser.set_window_size(1200, 800)
- 22. def site_url(url): base_url = 'http://%s' % socket.gethostname() if server.port is not 80: base_url += ':%d' % server.port return urlparse.urljoin(base_url, url) @step("I visit the site") def open_site(step): step.given('I visit "%s"' % site_url('/'))
- 23. Scenario: Add consumer with blank Contact name When I log in to admin with username "admin" and And I click "Consumers" And I click "Add consumer" And I fill in "Organisation" with "OOOO" And I fill in "Contact name" with "" And I fill in "Contact number" with "0399999999" And I fill in "Website" with "www.test.com" And I press "Save" Then I should see "This field is required" And there should be 0 consumers in the database
- 24. Fixtures
- 25. Feature: Create new API key As an administrator I want to create a new API key So that I can enable others to query API Background: Given I have users in the database: | username | password | is_superuser | | admin | secret | true |
- 26. Built in steps using Django's model introspection Given I have users in the database: ... Then there should be 1 consumer in the database And consumer should be present in the database: ...
- 27. Which are extendable @creates_models(User) def create_user(step): data = hashes_data(step) for hash_ in data: is_superuser = hash_.pop('is_superuser', Fals if is_superuser: user = User.objects.create_superuser(**ha else: user = User.objects.create_user(**hash_) user.save() reset_sequence(User)
- 28. Best practice
- 30. Given I have items in my cart When I go to checkout And I pay for the items Then everything worked
- 32. write reusable scenarios Scenario Outline: I edit a user to add a team Given users have permissions: | user | organisation | permission | | peon@org.org | OrgCorp | organisation_user | And I log in with email "<email>" through the profile serve When I visit site page "organisation/1/admin/user/4/edit" And I select option "Team 1" from selector "Team" And I press "Save" Then there should be 1 organisation member metadata in the Then organisation member metadata should be present in the | organisation__name | user__email | team | | OrgCorp | peon@org.org | Team 1 | Examples: | email | | god@god.org | | superuser@org.org | | poweruser@org.org |
- 33. tie each feature file to a single story
- 36. fin ;-P questions? colophon This presentation was done in reveal.js using Junction, Cantarell and Source Code Pro with photography from the Creative Commons. Infoxchange is hiring. Come and chat to me! blogs.gnome.org/danni dannipenguin http://www.flickr.com/photos/mau3ry/3763640652/