holmium.core

holmium.core provides utility classes to simplify writing pageobjects for webpages using selenium.

Nothing beats an example. Conventionally unit tests integrating with python-selenium are written similarly to the following code block (using seleniumhq.org).

import selenium.webdriver
import unittest



class SeleniumHQTest(unittest.TestCase):
    def setUp(self):
        self.driver = selenium.webdriver.Firefox()
        self.url = "http://seleniumhq.org"
    def test_header_links(self):
        self.driver.get(self.url)
        elements = self.driver.find_elements_by_css_selector("div#header ul>li")
        self.assertTrue(len(elements) > 0)
        expected_link_list = ["Projects", "Download", "Documentation", "Support", "About"]
        actual_link_list = [el.text for el in elements]
        self.assertEquals( sorted(expected_link_list), sorted(actual_link_list))

    def test_about_selenium_heading(self):
        self.driver.get(self.url)
        about_link = self.driver.find_element_by_css_selector("div#header ul>li#menu_about>a")
        about_link.click()
        heading = self.driver.find_element_by_css_selector("#mainContent>h2")
        self.assertEquals(heading.text, "About Selenium")

    def tearDown(self):
        if self.driver:
            self.driver.quit()

if __name__ == "__main__":
    unittest.main()

The above example does what most selenium tests do:

initialize a webdriver upon setUp
query for one or more web elements using either class name, id, css_selector or xpath
assert on the number of occurances / value of certain elements.
tear down the webdriver after each test case

It suffers from the typical web development problem of coupling the test case with the HTML plumbing of the page its testing rather than the functionality its meant to excercise. The concept of PageObjects reduces this coupling and allow for test authors to separate the layout of the page under test and the functional behavior being tested. This separation also results in more maintainable test code (i.e. if an element name changes - all tests dont have to be updated, just the pageobject).

Lets take the above test case for a spin with holmium. Take note of the following:

The initialization and reset of the webdriver is delegated to the HolmiumTestCase base class (alternatively the class could subclass unittest.TestCase and be run with the holmium nose plugin.
the page elements are accessed in the test only via PageElement & PageElementMap.

from holmium.core import HolmiumTestCase, PageObject, PageElement, Locators, PageElementMap


class SeleniumHQPage(PageObject):
    nav_links = PageElementMap( Locators.CSS_SELECTOR
                                        , "div#header ul>li"
                                        , key = lambda element : element.find_element_by_tag_name("a").text
                                        , value = lambda element: element.find_element_by_tag_name("a") )

    header_text = PageElement(Locators.CSS_SELECTOR, "#mainContent>h2")


class SeleniumHQTest(HolmiumTestCase):
    def setUp(self):
        self.page = SeleniumHQPage(self.driver, "http://seleniumhq.org")

    def test_header_links(self):
        self.assertTrue( len(self.page.nav_links) > 0 )
        self.assertEquals( sorted(["Projects", "Download", "Documentation", "Support", "About"])
                        ,  sorted(self.page.nav_links.keys() ) )

    def test_about_selenium_heading(self):
        self.page.nav_links["About"].click()
        self.assertEquals(self.page.header_text.text, "About Selenium")

if __name__ == "__main__":
    unittest.main()

Which can then be executed in a few different ways as shown below.

# if using HolmiumTestCase as the base class run as:
export HO_BROWSER=firefox;nosetests test_selenium_hq.py
# or..
export HO_BROWSER=firefox;python test_selenium_hq.py
# if using unittest.TestCase as the base class run as:
nosetests test_selenium_hq.py --holmium-browser=firefox

Metadata

Release files for holmium.core 0.1.5

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Source distribution (sdist)

Source distribution for holmium.core 0.1.5
File	Size	Uploaded
holmium.core-0.1.5.tar.gz	12.3 kB	Jan 12, 2013	Details

Built distribution (wheel)

Table of built distributions (wheels) for holmium.core 0.1.5
File	Interpreter	ABI	Platform	Reset
holmium.core-0.1.5-py2.7.egg 17.6 kB Jan 12, 2013	Legacy Egg format	-	-	Details

Total release size: 29.9 kB

Release files / holmium.core-0.1.5.tar.gz

Download URL	holmium.core-0.1.5.tar.gz
Size	12.3 kB
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Release files / holmium.core-0.1.5-py2.7.egg

Download URL	holmium.core-0.1.5-py2.7.egg
Size	17.6 kB
Tags	Egg
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