Testing with Selenium

Selenium (docs.seleniumhq.org) provides some tools for automatically driving your web pages and doing some testing. With a site that is continually under development its important to have some automated regression tests. Selenium lets us write these tests and in runs them in a real browser.

Use pip to install selenium.

Here's an example of a simple first program for running every activecode block in the book. It runs the activecodes and then checks to see if any of the runs fail by looing for elements with class equal to error.

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.support.ui import WebDriverWait # available since 2.4.0
from selenium.webdriver.support import expected_conditions as EC # available since 2.26.0

# Create a new instance of the Firefox driver
driver = webdriver.Firefox()

# go to a page by URL
driver.get("http://127.0.0.1:8000/runestone/static/thinkcspy/PythonTurtle/helloturtle.html")

done = False

while not done:
    allButtons = driver.find_elements_by_tag_name("button")

    for button in allButtons:
        if button.text == "Run":
            button.click()

    time.sleep(5) # not sure if this is really necessary or not.
    allErrors = driver.find_elements_by_class_name("error")

    for e in allErrors:
        print "There was an error in div %s " % e.get_attribute("id")

    lnext = driver.find_element_by_link_text("next")
    if lnext:
        print "going to: %s" % lnext.get_attribute("href")
        lnext.click()
    else:
        done = True