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Selenium in real world
       projects
  Automated testing of web applications

           Martin Kleppmann


                               Ept Computing | www.eptcomputing.com
Deploying a
                                                             new release
http://flickr.com/photos/josa/124264708/ (creative commons)
http://flickr.com/photos/dennissylvesterhurd/200001422/ (creative commons)
Selenium
Selenium in real-world projects: Automated testing for web applications
Selenium in real-world projects: Automated testing for web applications
Selenium in real-world projects: Automated testing for web applications
Model-View-Controller

             Controller
                               Unit testing

          Request
 Client
                           Model              DB
          Response


                    View
Build cycle
          Checkout latest version
          Run unit/model tests
          Migrate staging database
10 mins




          Deploy to staging server
          Fill database with example data
          Render lots of views: wget -r
          Run Selenium scripts
          Notify us of outcome
Model-View-Controller
Selenium
testing
              Controller
                                      Unit testing
           Request
  Client
                               Model                 DB
           Response


                     View
                            wget -r
Functional stack
  Rendering on screen
  DOM (Document tree)   Selenium
        HTML
                        wget -r
         HTTP
    Web framework       Model test
       Database
Sample script
# User is not logged in. Searches for auction and chooses it in the listing
selenium.type quot;search_queryquot;, quot;seleniumquot;
selenium.click quot;commitquot;
selenium.wait_for_page_to_load quot;30000quot;
selenium.click quot;link=Selenium test auction, single lot, normal+buy nowquot;
selenium.wait_for_page_to_load quot;30000quot;
# User places a bid of 12 pounds (below the reserve price)
selenium.type quot;bid_max_price_vattedquot;, quot;12quot;
selenium.click quot;bid_submitquot;
selenium.wait_for_page_to_load quot;30000quot;
# User logs in as Adalbert
selenium.type quot;loginquot;, quot;adalbertquot;
selenium.type quot;passwordquot;, quot;asdfquot;
selenium.click quot;commitquot;
selenium.wait_for_page_to_load quot;30000quot;
# Bid confirmation page
selenium.click quot;bid_submitquot;
selenium.wait_for_page_to_load quot;30000quot;
# Redirected to auction page - check Adalbert is losing
assert selenium.is_text_present(quot;You are losing your bid on this auctionquot;)
assert selenium.is_text_present(quot;below the seller's reserve pricequot;)
Demo
Selenium strong points
• Simple and powerful DOM-level testing
• Fairly stable – ok for continuous integration
• Ajax-heavy apps (cross-browser issues)
• Testing typical user flows
• Good fit with Agile et al.
• Open Source
Selenium weak points
• Fiddly setup, platform maintenance
• Tedious error diagnosis
• Valid UI changes may break test
• Rendering tests limited
• Interaction with Flash
• Slow; concurrency problematic
• Heavily dependent on state – generate data
The future
• “Selenium on demand” service – “rent a
  web browser”, large choice of platforms
• Acceptance testing; testing impact of ads
• Memory leak detection
• Access to email in tests
• etc...

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Selenium in real-world projects: Automated testing for web applications

  • 1. Selenium in real world projects Automated testing of web applications Martin Kleppmann Ept Computing | www.eptcomputing.com
  • 2. Deploying a new release http://flickr.com/photos/josa/124264708/ (creative commons)
  • 8. Model-View-Controller Controller Unit testing Request Client Model DB Response View
  • 9. Build cycle Checkout latest version Run unit/model tests Migrate staging database 10 mins Deploy to staging server Fill database with example data Render lots of views: wget -r Run Selenium scripts Notify us of outcome
  • 10. Model-View-Controller Selenium testing Controller Unit testing Request Client Model DB Response View wget -r
  • 11. Functional stack Rendering on screen DOM (Document tree) Selenium HTML wget -r HTTP Web framework Model test Database
  • 12. Sample script # User is not logged in. Searches for auction and chooses it in the listing selenium.type quot;search_queryquot;, quot;seleniumquot; selenium.click quot;commitquot; selenium.wait_for_page_to_load quot;30000quot; selenium.click quot;link=Selenium test auction, single lot, normal+buy nowquot; selenium.wait_for_page_to_load quot;30000quot; # User places a bid of 12 pounds (below the reserve price) selenium.type quot;bid_max_price_vattedquot;, quot;12quot; selenium.click quot;bid_submitquot; selenium.wait_for_page_to_load quot;30000quot; # User logs in as Adalbert selenium.type quot;loginquot;, quot;adalbertquot; selenium.type quot;passwordquot;, quot;asdfquot; selenium.click quot;commitquot; selenium.wait_for_page_to_load quot;30000quot; # Bid confirmation page selenium.click quot;bid_submitquot; selenium.wait_for_page_to_load quot;30000quot; # Redirected to auction page - check Adalbert is losing assert selenium.is_text_present(quot;You are losing your bid on this auctionquot;) assert selenium.is_text_present(quot;below the seller's reserve pricequot;)
  • 13. Demo
  • 14. Selenium strong points • Simple and powerful DOM-level testing • Fairly stable – ok for continuous integration • Ajax-heavy apps (cross-browser issues) • Testing typical user flows • Good fit with Agile et al. • Open Source
  • 15. Selenium weak points • Fiddly setup, platform maintenance • Tedious error diagnosis • Valid UI changes may break test • Rendering tests limited • Interaction with Flash • Slow; concurrency problematic • Heavily dependent on state – generate data
  • 16. The future • “Selenium on demand” service – “rent a web browser”, large choice of platforms • Acceptance testing; testing impact of ads • Memory leak detection • Access to email in tests • etc...