WEB TESTING WITH SELENIUM AND JUNIT

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WEB TESTING WITH SELENIUM AND JUNIT
David Ross Drake - SDET
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What is Selenium?

• Selenium
• Portable software testing framework for web
  applications
• Selenium IDE
• Selenium Client Drivers
• Selenium RC
• Selenium Grid

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Why use Selenium?

• Why automated testing?
• Speed
• Repeatability
• Reliability
• Cost
• Requalification (security patches)
• Verisimilitude (vs HTMLUnit)

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DEMONSTRATION SELENIUM IDE
Recording and playing back a test with Selenium
IDE
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Selenium Locators

• id fastest method
• name
• link
• dom
• css
• xpath slowest method

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DEMONSTRATION EXPORTING TESTS
Exporting tests from Selenium IDE into JUnit and
running using Selenium RC
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Selenium RC
Image www.seleniumhq.org
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Selenium Challenges

• Web app latency can cause tests to fail waiting
  on page events
• Tests tend to lock in web pages, slowing
  iterative development
• Selenium core is JavaScript based
• Not all browsers interpret the same way
• Can't perform cross-domain testing
• Testing secure connections is tricky, and often
  browser specific
• Execution is slow (compared to most unit tests)
• Formatting problems are untested

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Handling Event Latency
Example An event is triggered on the page when a
user enters invalid data. public static void
waitForPageValidation(DefaultSelenium selenium,
String id) throws InterruptedException
for (int second 0 second) if
(second gt 5) fail("timeout waiting for
event) try
if (selenium.isVisible(id))
break
catch (Exception e)
Thread.sleep(1000)
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Managing Change

• Separate page content used in tests from actual
  test logic. Most frequently used content
• Page titles
• Field locators (ids, names)

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Selenium 2
Advantages Disadvantages
No Selenium RC installation No final version released (summer 2011)
Cross-domain testing capabilities Limited backwards compatibility
Object-oriented API Smaller number of supported browsers
Mobile browser testing
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Speeding Up Selenium

• Avoid xpath have id attributes for all tested
  fields
• Reuse browser sessions (although this can cause
  subsequent tests to fail if the session fails)
• Test local builds to reduce network latency
• Avoid using multi-page test flows for atomic
  tests
• Use parameterized tests to test multiple browsers
  at once
• Parallelize tests to run multiple test classes at
  once
• Use cloud-based testing services

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Testing Tools in Sauce Labs

• Sauce Scout Manual testing using dozens of
  os/browser/version combinations
• Sauce OnDemand Automated cloud-based testing
  using a drop in replacement for selenium RC
• Sauce Connect Tunneling utility for connecting
  to an application under test behind a firewall
• Sauce Builder Selenium IDE modified to run
  tests using Sauce OnDemand

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Cloud-based testing in Sauce Labs
Image www.saucelabs.com
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DEMONSTRATION SAUCE LABS
Running tests using Sauce Labs and viewing the
results
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Additional Resources

• http//www.seleniumhq.com - selenium docs and
  downloads
• http//www.saucelabs.com - cloud-based selenium
  testing.
• http//cargo.codehaus.org - thin wrapper for java
  containers
• http//ce-games.blogger.com - links to this
  presentation