Building your own Monkey - The Era of Automation

Selenium + Python + Lettuce/Behave + ChromeDriver

Transcript

1. Building your own Monkey The Era of Automation Letícia Rostirola
2. Why Automation? • Saves you time, money and people • Consistency of tests • Continuous Integration • Avoid boredom
3. What to automate? • Repetitive tasks (monkey job) • Frequently used functionality • Tests that take a lot of effort and time when manual testing • Tests that run on several different hardware or software platforms and configurations. • ...
4. Writing test scenarios
5. Gherkin: a natural language style “Gherkin is designed to be easy to learn by non-programmers, yet structured enough to allow concise description of examples to illustrate business rules in most real-world domains”. https://cucumber.io/docs/reference
6. Automation tools
7. Web browser automation Selenium “Selenium automates browsers. That's it! What you do with that power is entirely up to you”.
8. Web browser automation Selenium vs Splinter
9. Python BDD frameworks Behave vs Lettuce Lettuce is not compatible with Python 3 :(
10. Example: Behave vs Lettuce
11. Structure and execution features/ features/your_feature.feature features/steps/steps.py your_project$ behave features/ features/ your_feature.feature features/steps.py your_project$ lettuce
12. Running https://github.com/PyLadiesSanca/little-monkey
13. $ pip install selenium $ pip install lettuce $ pip install chromedriver
14. features/twitter/tweet.feature Feature: Tweet Scenario: Invalid login Given I am logged in as "invalid" Then I should see the message "The email and password you entered did not match our records. Please double-check and try again." Scenario: Tweet like a crazy teenager > 140 chars Given I am logged in as "me" When I write the tweet "Restart não presta mais porque eu cheguei aqui 8 horas da manhã e eles não vieram falar com a gente. Não, eu não vou perdoar. Eu vou xingar no twitter hoje, muito. Sério." Then I should not be able to submit the tweet Scenario: Tweet like a pro Given I am logged in as "me" When I write the tweet "This is my first tweet using automation \o/ #selenium #python" And I press "js-tweet-btn" button Then I should see my tweet
15. features/src/config.py (optional) # Hostname of the application being tested TWITTER_HOST = 'https://twitter.com/' PATH = '<your_path>/little-monkey' ## Chromedriver path CHROMEDRIVER = '/home/lero/.virtualenvs/little-monkey-lettuce/chromedriver' USERS = { 'me': { 'username': 'my@email.com', 'password': 'pass' } } BROWSER = 'chrome’
16. features/src/terrain.py from config import BROWSER, PATH, CHROMEDRIVER from lettuce import before, after, world from selenium import webdriver @before.all def setup_browser(): if BROWSER == 'chrome': chrome_options = webdriver.ChromeOptions() world.browser = webdriver.Chrome(executable_path=CHROMEDRIVER, chrome_options=chrome_options) world.browser.set_window_size(1280,800) ... @after.all def tear_down_feature(self): world.browser.quit()
17. features/src/steps.py from config import TWITTER_HOST, USERS, PATH from lettuce import step, world from lettuce_webdriver.util import assert_true, assert_false, AssertContextManager from selenium.webdriver.common.keys import Keys from selenium.webdriver.common.by import By from selenium.webdriver.support.ui import WebDriverWait @step('I write the tweet "(.*?)"$') def I_write_twitter_post(step, tweet): with AssertContextManager(step): WebDriverWait(world.browser, 10).until( EC.presence_of_element_located((By.ID, "tweet-box-home-timeline"))) element = world.browser.find_element_by_id("tweet-box-home-timeline") element.clear() element.send_keys(tweet) @step('I should see the message "([^"]+)"$') def should_see(step, text): assert_true(step, contains_content(world.browser, text.encode('utf-8'))) ...
18. Tips • Be aware of Chromedriver/chrome version ◦ Chrome headless requires chromedriver 2.3+ • Use Selenium explicit/implicit wait instead of python time.sleep function ◦ Better, faster and stronger • Use find_by_id (or similar) instead of find_by_xpath ◦ IE provides no native XPath-over-HTML solution
19. References https://www.merixstudio.com/blog/behavior-driven-development-python/ https://github.com/PyLadiesSanca/little-monkey https://www.guru99.com/smoke-sanity-testing.html https://github.com/cobrateam/splinter http://www.seleniumhq.org/
20. Thanks