The parallel execution of test cases is one of the important requirements of a modern test automation framework. Generally, to run Selenium Suite in parallel, we use the selenium grid and distributing tests across multiple machines which will reduce the time required for running tests. To run tests in parallel, we need to configure Selenium Grid with Hub and Nodes where the hub is the central point that will receive test requests along with configurations or capabilities. Based on the request received, the hub will distribute tests to the registered nodes. Selenium has made a set of Docker images that are available on Docker Hub. We have Selenium Grid, and the browser images – Chrome and Firefox. There are also images with the debug versions which will let as view the test execution. Also, we will compare the Selenium docker with other solutions like Selenoid, Go Grid Router, Zalenium and will go throw advantages and disadvantages. In this session, we will go through the Selenium tests parallel run setup and configuration. https://2019.testwarez.pl/agenda/getting-started-with-dockerization-of-selenium-tests-execution/

1. Getting Started with Dockerization of Selenium Tests Execution
Sargis Sargsyan, Testwarez, Poland 2019


2. 2
Sargis Sargsyan
Director, Quality Assurance at PicsArt

3. #TestWarez2019
3
Introduction to Presentation
1 Why? 2 What is Selenium Grid 3
Running Selenium Suite
in Parallel
4 What is Docker Selenium 5
Configure Selenium Grid
in Docker Containers
6
Creating and maintaining
docker-compose file
7 Zalenium 9 Q&A8 Selenoid

4.  Why? Don’t you have an answer yet?

5. #TestWarez2019Why we need to Dockerize Selenium Run
Run in different environment
Easy to setup
Secure
More Stability
No need to manage Selenium server jar
No need to download drivers, as it is done automatically
You Do Not Need to Make the Switch to Parallel Testing All at Once
Capacity to Scale (Parallel Running)

6. #TestWarez2019Reasons to Start Running Tests in Parallel
Test for wider Compatibility
Can radically reduce testing time
Optimizes continuous integration and delivery
Cost effective testing
Enables teams to focus on making tests repeatable, measurable and accurate
You can still perform sequential tests, when needed
You Do Not Need to Make the Switch to Parallel Testing All at Once

7.  Getting Started with Selenium Grid & Docker

8. #TestWarez2019What is Selenium Grid
Selenium Grid is a smart proxy server that allows Selenium tests
to route commands to remote web browser instances. Its aim is to
provide an easy way to run tests in parallel on multiple machines.
With Selenium Grid, one server acts as the hub that routes JSON
formatted test commands to one or more registered Grid nodes.
Tests contact the hub to obtain access to remote browser
instances. The hub has a list of registered servers that it provides
access to, and allows us to control these instances. Selenium Grid
allows us to run tests in parallel on multiple machines, and to
manage different browser versions and browser configurations
centrally (instead of in each individual test). Selenium Grid isn't a
silver bullet. It solves a subset of common delegation and
distribution problems, but will for example not manage your
infrastructure and might not suit your specific needs.
Selenium Grid
a *SeleniumHQ Documentation
Diagram from https://www.ranorex.com

9. #TestWarez2019What is Selenium Hub and Nodes
• Intermediary and manager
• Accepts requests to run tests
• Takes instructions from client and executes them
remotely on the nodes
• Manages threads
Hub
a *SeleniumHQ Documentation
• This is where the browsers live
• Registers itself to the hub and communicates its
capabilities
• Receives requests from the hub and executes
them
Nodes

10. #TestWarez2019Docker Selenium Grid
• Selenium hub image
• Selenium node-firefox image
• Selenium node-chrome image
• Selenium node-firefox-debug image
• Selenium node-chrome-debug image
Selenium Images
a *SeleniumHQ Documentation
As normal grid with docker we have to install the
hub and browser nodes into Docker containers and
then start the hub and nodes from the Docker
container.
Selenium Grid with Docker

11. #TestWarez2019Prepare Sample Tests
Run tests:
Open a terminal
Clone this project
~$ git clone https://github.com/sargissargsyan/selenium-parallel-run.git
cd selenium-parallel-run
mvn clean install -DskipTests
mvn test

12. #TestWarez2019How to Dockerize Parallel Execution of Selenium Tests
Demo

13.  Setup Selenium Docker locally
Selenium Docker

14. #TestWarez2019How to Dockerize Parallel Execution of Selenium Tests
~$ docker -v
Docker version 18.09.2, build 6247962
java version "1.8.0_191" Java(TM) SE Runtime Environment
~$ java -version
Apache Maven 3.6.0
~$ mvn -v
docker-machine version 0.16.1, build cce350d7
~$ docker-machine -v
docker-compose version 1.23.2, build 1110ad01
~$ docker-compose -v

15. #TestWarez2019How to Dockerize Parallel Execution of Selenium Tests
~$ docker network create grid

16. #TestWarez2019How to Dockerize Parallel Execution of Selenium Tests
~$ docker run -d -p 4444:4444 --net grid --name selenium-hub
selenium/hub:3.141.59-vanadium

17. #TestWarez2019How to Dockerize Parallel Execution of Selenium Tests
~$ docker run -d --net grid -e HUB_HOST=selenium-hub -v /dev/
shm:/dev/shm selenium/node-chrome:3.141.59-vanadium

18. #TestWarez2019How to Dockerize Parallel Execution of Selenium Tests

19. #TestWarez2019How to Dockerize Parallel Execution of Selenium Tests
~$ docker network rm grid
~$ docker stop selenium-hub
~$ docker rm selenium-hub
~$ docker stop chrome-node
~$ docker rm chrome-node

20. #TestWarez2019Selenium Docker up using Docker Compose
~$ cd /selenium-parallel-run
~$ docker-compose -f docker-compose-selenium-docker.yml up -d
~$ docker-compose -f docker-compose-selenium-docker down

21. #TestWarez2019Selenium Docker up using Docker Compose
Demo

22.  A flexible and scalable Selenium Grid
Zalenium

23. #TestWarez2019How to Build Zealenium?
 Zalenium works conceptually in a simple way
a * Zalenium
~$ docker pull elgalu/selenium
~$ docker pull dosel/zalenium

24. #TestWarez2019How to Build Zealenium?
 Zalenium works conceptually in a simple way
a * Zalenium
~$ docker run --rm -ti --name zalenium -p 4444:4444
-v /var/run/docker.sock:/var/run/docker.sock
-v /tmp/videos:/home/seluser/videos
—privileged dosel/zalenium start

25. #TestWarez2019Zalenium up using Docker Compose
~$ cd /selenium-parallel-run
~$ docker-compose -f docker-compose-zalenium.yml up --force-recreate -d
~$ docker-compose -f docker-compose-zalenium.yml down

26. #TestWarez2019Zalenium up using Docker Compose
Demo

27.  Selenoid

28. #TestWarez2019Pre steps
Install Configuration Manager script
~$ curl -s https://aerokube.com/cm/bash | bash
Run Selenoid
~$ ./cm selenoid start --vnc
Pull browser image
~$ docker pull selenoid/vnc_chrome:71.0
Run Selenoid UI
~$ ./cm selenoid-ui start

29. #TestWarez2019Selenoid
Demo

30. #TestWarez2019Links
https://github.com/SeleniumHQ/docker-selenium
https://opensource.zalando.com/zalenium/
https://aerokube.com/selenoid/latest/
https://aerokube.com/cm/latest/

31. #TestWarez2019Thank You!
Ñ
sargis.sargsyan@live.com
t
@sargiset
ą
/in/sargissargsyan