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Testing Web MappingApplications and WebServices using Python

Jáchym ČepickýOSGeo.org● Member● Board member (2012-2015)● SecretaryOpen source software developer, contributor, user● GRASS GIS● PyWPS● OpenLayers, …● http://opengeolabs.czCurrent: Head of Internal development at Cleerio inc.

What is software testing“Software testing is an investigation conducted to provide stakeholders withinformation about the quality of the product or service under test”-- Wikipedia, https://en.wikipedia.org/wiki/Software_testing

What do testers doSoftware testers do not make software.But they make it better-- Sergejus Bartos, http://pt.slideshare.net/SergejusBartos/

What they really doTesterDeveloper

Software testing impacthttps://en.wikipedia.org/wiki/Software_testingCost to fix a defectTime detectedRequirements Architecture Construction System test Post-releaseTimeintroducedRequirements 1× 3× 5–10× 10× 10–100×Architecture -- 1× 10× 15× 25–100×Construction -- -- 1× 10× 10–25×

History of testingUntil 1956 – Debugging oriented1957–1978 – Demonstration oriented1979–1982 – Destruction oriented1983–1987 – Evaluation oriented1988–2000 – Prevention oriented

Testing typesStatic × Dynamic

Testing typesWhite box × Gray box × Black box

Testing levelsUnit testingIntegration testingSystem testing...

Unit testing vs. System testing

How we test web mapapplication at Cleerio.com

Unit tests - front-end and back-end

Integration and system tests - manual work

Deploying new version without system testing

Learn Python for testing!● Easy to learn● Test frameworks● Geo-positive

Testing software stack● Jenkins https://jenkins.io/● Python http://python.org● PhandomJS http://phantomjs.org/● Selenium http://www.seleniumhq.org/ | http://selenium-python.readthedocs.io/

Start to lear Python, it’s easy!

from selenium import webdriverfrom selenium.webdriver.support.ui import WebDriverWaitfrom selenium.webdriver.support import expected_conditions as EC# …self.driver = webdriver.Chrome('chromedriver/bin/chromedriver')self.wait = WebDriverWait(self.driver, 90)self.driver.set_window_size(1366, 768)self.driver.get(“http://maps.foo.bar/test”)self.wait.until(EC.presence_of_element_located((By.CSS_SELECTOR, '.ol-viewport')))

self.assertTrue(driver.find_element_by_class_name('gs-app'))self.assertTrue(driver.find_element_by_css_selector('div.gs-disclaimer'))

self.wait.until(EC.presence_of_element_located((By.CSS_SELECTOR, div.gs-disclaimer')))div = self.driver.find_element_by_css_selector('div.gs-disclaimer')agree_button = div.find_element_by_css_selector('button[data-gs-handler=agree]')agree_button.click()

with self.assertRaises(NoSuchElementException, msg='Discalimer dismissed'):self.driver.find_element_by_css_selector('div.gs-disclaimer')

menu_button = self.driver.find_element_by_css_selector('div.test-menu-button button[data-gs-handler=menu]')menu_button.click()login_item = case.driver.find_element_by_css_selector('ul.gs-main-menu li button ...')login_button = login_item.find_element_by_xpath('..')login_button.click()

loginform = case.driver.find_element_by_class_name('loginform')self.assertTrue(loginform,"Module login main div visible")

user_input = loginform.find_element_by_css_selector('input[name=login_username]')passwd_input = loginform.find_element_by_css_selector('input[name=login_password]')submit_button = loginform.find_element_by_css_selector('button[data-gs-handler=submit]')user_input.send_keys(login_username)passwd_input.send_keys(login_password)submit_button.click()

self.assertTrue(self.driver.find_elements_by_class_name('test-loader'),"Loading indicator visible")self.wait.until(EC.invisibility_of_element_located((By.CLASS_NAME, 'test-loader')))

with case.assertRaises(NoSuchElementException, msg="Login module div not available"):self.driver.find_element_by_css_selector('div.test-logindiv')

mapcanvas = self.driver.find_element_by_css_selector('canvas.ol-unselectable')action = webdriver.common.action_chains.ActionChains(case.driver)action.move_to_element_with_offset(mapcanvas, 700, 400)action.click()action.move_to_element_with_offset(mapcanvas, 700, 450)action.click()self.driver.save_screenshot('screenie.png')

Result: Happy product ownerJonáš: Product owner at Cleerio

IssuesTest stability - usually back-end problemDevelopers complaining about tests falling downNot so easy reporting of broken tests

======================================================================ERROR: test_datagrid (tests.map_application.servers.TestBranchComplex)Test gs.module.Datagrid----------------------------------------------------------------------Traceback (most recent call last):File "tests/map_application/__init__.py", line 153, in test_datagriddatagrid.test(self, True)File "tests/map_application/modules/datagrid.py", line 20, in testls_show_module(case, 'datagrid', layer_id)File "tests/map_application/modules/layerswitcher.py", line 169, in show_modulemodule_button.click()File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webelement.py", line 75, in clickself._execute(Command.CLICK_ELEMENT)File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webelement.py", line 469, in _executereturn self._parent.execute(command, params)File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 201, in executeself.error_handler.check_response(response)File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 194, in check_responseraise exception_class(message, screen, stacktrace)StaleElementReferenceException: Message: {"errorMessage":"Element is no longer attached to the DOM","request":{"headers":{"Accept":"application/json","Accept-Encoding":"identity","Connection":"close","Content-Length":"81","Content-Type":"application/json;charset=UTF-8","Host":"127.0.0.1:46272","User-Agent":"Python-urllib/2.7"},"httpVersion":"1.1","method":"POST","post":"{"sessionId": "89569f10-33c8-11e6-bee5-bb4fe1c88b42", "id": ":wdc:1466084714415"}","url":"/click","urlParsed":{"anchor":"","query":"","file":"click","directory":"/","path":"/click","relative":"/click","port":"","host":"","password":"","user":"","userInfo":"","authority":"","protocol":"","source":"/click","queryKey":{},"chunks":["click"]},"urlOriginal":"/session/89569f10-33c8-11e6-bee5-bb4fe1c88b42/element/:wdc:1466084714415/click"}}Screenshot: available via screen

!** No element<cookie class=”my-cookie” data-value=”chockolate” />found

Conclusion● Easy to setup● Easy to implement with new programmers in team - Python is easy andmakes fun!● Everybody is happy with the result - shipping well tested and integratedapplication with less bugs makes sense● Python is great even for web mapping software tests.

Result 2: Happy testerMagdalena: Tester at Cleerio

?Jachym Cepicky@jachymcjachym.cepicky@cleerio.comMagdalena Kabatova@madlenkkmagdalena.kabatova@cleerio.com

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