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 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 which 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 which 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. In this session, we will go through the Selenium tests parallel run setup and configuration.

1. Easy Setup for Parallel Test Execution with Selenium Docker
Sargis Sargsyan


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Sargis Sargsyan
Principal Software Engineer in Test

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Introduction to Presentation
1 Why? 2 What is Selenium Grid 3 What is Docker Selenium
4
Configure Selenium Grid
in Docker Containers
5
Running Selenium Suite
in Parallel
6
Creating and maintaining
docker-compose file
7
View test execution using
debug nodes via VNC
9 Q&A8 Zalenium + Sauce Labs

4.  Why we should run our test in Parallel?
Why?

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Why? Why we should run tests in Parallel
Running Selenium tests is slow. Parallel
testing is allowing us to speed up the test
runtime. Also it allows us to increase
coverage and run tests in different browser
on the same time.
Parallel Test Running
Possibility to test more than one
set of configurations
Save Time! Reduce the time of
test suite run
Cost per Test to run
More browser/OS coverage
Fast feedback
Less Manual Testing

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Disadvantages
 What are the disadvantages of Selenium Grid
The performance of Selenium grid is low, in case if you are running large amount of the test and need large
amount of nodes
Setting up parallel running test suite requires time
In case of large amount of tests it will be necessary to divide the suite into parts and run them in
different machines
If the suite was divided to pars there will be some difficulties in analyzing statistics, as there will be
divided reports
As the code is executed on the same machine the test were launched and the machine only receives the
browser control commands. It is creating issues with uploading or downloading files

7.  What is Selenium Grid

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What 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

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What 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

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Docker 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.  A flexible and scalable Selenium Grid
Zalenium

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Zalenium A grid that scales using docker-selenium
Ƽ Hard to maintain a Selenium Grid
Ƽ
Allow anyone to have a disposable and flexible
Selenium Grid infrastructure
Why Zalenium?What is Zalenium?
Dinamic, on-demand Selenium Grid
Based on docker-selenium
Simple to setup and run
a * Zalenium

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Zalenium Additional Features
 Get a grid up and running in a few seconds!
Test status and steps directly in the video
Basic auth grid protection when deploying Zalenium in the cloud (AWS, GCP, …)
Mount volumes across containers when you need to specific files in your tests
a * Zalenium

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How It Works?
 Zalenium works conceptually in a simple way
a * Zalenium

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How It Works?
 Zalenium works conceptually in a simple way
a * Zalenium

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How to Build Zealenium?
 Zalenium works conceptually in a simple way
a * Zalenium
docker pull elgalu/selenium
docker pull dosel/zalenium

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How to Build Zealenium?
 Zalenium works conceptually in a simple way
a * Zalenium
docker run --rm -ti --name zalenium -p 4444:4444
-e DOCKER=17.06.2-ce
-v /var/run/docker.sock:/var/run/docker.sock
-v /tmp/videos:/home/seluser/videos
--privileged dosel/zalenium start

18.  Zalenium works conceptually in a simple way
How to Build Zalenium?

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How to Build Zealenium with docker-compose?
 Zalenium works conceptually in a simple way
a * Zalenium
# Usage:
# docker-compose up --force-recreate
version: '2.1'
services:
zalenium:
image: "dosel/zalenium"
container_name: zalenium
hostname: zalenium
tty: true
volumes:
- /tmp/videos:/home/seluser/videos
- /var/run/docker.sock:/var/run/docker.sock
- /usr/bin/docker:/usr/bin/docker
ports:
- 4444:4444
command: >
………………………….
………………………….

22.  Zalenium works conceptually in a simple way
How to Run Test?

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How to Build Zalenium?
 Zalenium works conceptually in a simple way

25.  Zalenium works conceptually in a simple way
View browser via VNC in Zalenium?

27.  Cloud-hosted web and mobile application automation platform
Sauce Labs

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Sauce Labs
 A flexible and scalable Selenium Grid
As the co-developers of Selenium, our
team maintains the most up-to-date and
reliable platform for web testing. Test
securely knowing that our experts can
help your organization build their test
automation strategy.
What is Sauce Labs
Ƽ Run Selenium tests in real browsers in cloud
Write test in most popular languages
Specify platform configuration
Spent less time to setting up and maintaining
your testing infrastructure
a * Sauce Labs

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Sauce Labs
 A flexible and scalable Selenium Grid
a * Sauce Labs

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How to Run Tests Against Sauce Labs?
 Cloud-hosted web and mobile application automation platform

31.  Cloud-hosted web and mobile application automation platform
How to Run Tests Against Sauce Labs?

33.  Redirect the test to a cloud testing provider
Zalenium + Sauce Labs

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Zalenium + Sauce Labs
 Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam.
If you need a capability that cannot be fulfilled
by docker-selenium, the test gets redirected to a
cloud testing provider (i.e. Sauce Labs)
Zalenium + Sauce Labs

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How to Build Zealenium with Saucelabs?
 Zalenium works conceptually in a simple way
a * Zalenium
export SAUCE_USERNAME=<your Sauce Labs username>
export SAUCE_ACCESS_KEY=<your Sauce Labs access key>
export SAUCE_LABS_URL=<your Sauce Labs url:port number>

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How to Build Zealenium with Saucelabs?
 Zalenium works conceptually in a simple way
a * Zalenium
docker run --rm -ti --name zalenium -p 4444:4444
-e SAUCE_USERNAME -e SAUCE_ACCESS_KEY -e SAUCE_LABS_URL
-v /tmp/videos:/home/seluser/videos
-v /var/run/docker.sock:/var/run/docker.sock
--privileged dosel/zalenium start --sauceLabsEnabled true

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How to Build Zealenium with Saucelabs?
 Zalenium works conceptually in a simple way

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Create Remote Driver for Chrome
 Zalenium works conceptually in a simple way

39.  Zalenium works conceptually in a simple way
Run Selenium Tests on Chrome

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Create Remote Driver for Chrome / Windows Zalenium works conceptually in a simple way

42.  Zalenium works conceptually in a simple way
Run Selenium Tests on Chrome / Windows

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Tools and Services

Selenium Web Driver Zalenium/Selenium Grid Sauce Labs Docker
https://github.com/sargissargsyan/selenium-parallel-run

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Thank You!
Ñ
sargis.sargsyan@live.com
t
@sargisset
ą
/in/sargissargsyan