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Subline
HEADLINE
• whoami?
• How we use Selenium
• Selenium as a Service (Saucelabs / BrowserStack / …)
• Building your own Selenium GRID on AWS EC2
Selenium Meetup
What are we gonna talk about?
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ABOUT MY COMPANY
WeltN24 GmbH - Axel Springer SE
APPSMOBILE
PRINT ONLINE
SOCIALMEDIA TV
USE CASES
Selenium GRID
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www.welt.de m.welt.de
Des
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Pag
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Mob
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SingleSignOn
Pay
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kflo
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CUCUMBER
BDD with Gerkhin
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CUCUMBER
Step Implementation
CUCUMBER
Page Objects (e.g. with Fluentlenium)
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FROM LOCALHOST TO CLOUD
First steps - Localhost
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• „chief cook and bottle washer“ server (eierlegende Wollmilchsau Server) • Jenkins for Test Execution • Tomcat (webapp) for collecting and presenting test results • Firefox instances as many as Jenkins Executors • Selenium Standalone
• -> Left-over Firefox Instances • -> Full Hard Drives • -> Other Services not being able to run • -> Resource Conflicts • Either everything works or nothing
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HEADLINE
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FROM LOCALHOST TO CLOUD
First steps - Saucelabs
• Account at Saucelabs
• - Firewall Exclusions for Tests on Staging Systems • wide ip range • with changes every couple of months
• - Sometimes long response times -> failing tests
• + Throw-away Servers == no Re-Usage of VMs • + Video Recordings of Sessions • + No Stuck Browsers
• >1000$ / month
HEADLINE
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FROM LOCALHOST TO CLOUD
First steps - BrowserStack
• Evaluation of BrowserStack
• - Hosting on AWS • -> Wide AWS IP Range had to be whitelisted in Firewall for Stages • -> Security / Privacy Issue
• - Re-Usage of VMs • - A lot of False Positives • - NO Video Recordings of Sessions • - In the end more expensive than Saucelabs
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FROM LOCALHOST TO CLOUD
Make or buy
-> Best satisfaction with Saucelabs
HEADLINE
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FROM LOCALHOST TO CLOUD
Chef Cookbooks for Infrastructure
vagrant-aws + chef + selenium cookbook = GRID @ AWS
HEADLINE
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AWS Architecture FROM LOCALHOST TO CLOUD
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HEADLINE
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FROM LOCALHOST TO CLOUD
Setting up AWS Infrastructure
HEADLINE
EC2 Instance Overview
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FROM LOCALHOST TO CLOUD
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HEADLINE
SublineAuto Scaling Group for Selenium Nodes FROM LOCALHOST TO CLOUD
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Auto Scaling Group for Selenium Nodes FROM LOCALHOST TO CLOUD
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CloudWatch - Custom Metrics FROM LOCALHOST TO CLOUD
Upscaling • Pushing Pending Requests with cron job from HUB -> increases ‚Desired‘ Size at AutoScalingGroup
Downscaling • AWS EC2 pay at least 1h • Nodes check from 50 to 60min if they are idle
if idle -> a) detach from Grid b) self destroy c) decrease Desired Size at ASGroup
• if they are not idle in that timespan they got to live for another 50-60min
HEADLINE
Selenium Grid Console
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FROM LOCALHOST TO CLOUD
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LIMITATIONS OF AWS
Auto Scaling + AMIs
• Analytics showed that >50% of our users are on Windows • -> right now 100% Windows Nodes • unix nodes planed for DesiredCapability Platform=ANY • Unix nodes are even easier, because they can be completely provisioned
• Challenges of Windows Nodes -> No easy provisioning with Chef
• so far manually configured Windows AMI, that evolved over time • (not yet time invested in provisioning naked Windows,
e.g. Windows Templates for Packer)
• AutoScalingGroups work with AMIs • ASGroups are based on LaunchConfigurations • in LC’s you have to configure an AMI to launch • -> no downside of Windows Nodes for our setup
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LEARNINGS
Limitations of Webdriver and Selenium
• Keep requests to the DOM at a minimum • e.g.: Don’t iterate through an XML file with WD requests
• No matter what, always stop the Browser at the end of your test
• Clean temporary files often
• Have a TimeOut in your code for interrupting page loads being stuck
FUTURE CHALLENGES
Testing Microservices
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• WELTN24 is going to make a big switch from a monolith to micro services:
• Advantage: Teams can deploy independently and more often • Requirement: Fully automated deployment
• Limitations of GUI-Tests (End2End Tests): • The higher you get in the testing pyramid the more flaky your tests get • -> Flaky tests don’t suit a fully automated deployment pipeline!?
• Challenge: Can GUI Tests tests be integrated in automated deployments?
• Proposal: Stable and smart Test Journeys through GUI for business critical paths • combined with Contract Based Testing for ensuring functional behavior?
REFERENCES
LINKS AND TOOLS
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• https://github.com/dhoer/chef-selenium/ • https://github.com/mitchellh/vagrant-aws • https://github.com/agileorbit-cookbooks/java • https://github.com/FluentLenium/FluentLenium/ • https://github.com/cucumber/cucumber-jvm/ • http://aws.amazon.com/de/ec2/
Worth a look at: https://github.com/groupon/Selenium-Grid-Extras
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THANK YOU
STAY IN TOUCH
• Slides will be on: • http://de.slideshare.net/urbanharry
• STAY IN TOUCH • @HarrysIdeAS
• „Harry Urban“ -> • LinkedIn • XING
Questions?
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