eliasnogueira / selenium-dynamic-grid-example

Example project that run multi-browser web test automation in parallel using Selenium Grid and Docker

Selenium Dynamic Grid Example

Selenium 4 has the Selenium Grid project where we can use docker images to run the test targeting a container with a browser. We can approach this in different ways, and one of the most beneficial for multi-browser testing is using the Dynamic Grid.

Note that this project contains basic examples using TestNG and JUnit 5. The main intent is to give you examples to run multi-browser parallel tests.

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How to run this project

1. Navigate to the grid folder:

   cd grid

2. Start the Selenium Grid:

   • if you have a MacOS machine first run in your Terminal socat -4 TCP-LISTEN:2375,fork UNIX-CONNECT:/var/run/docker.sock:

docker-compose up

1. Open the grid dashboard at http://localhost:4444/

2. Run the test:

   • src/test/java/com.eliasnogueira.junit.MultiBrowserDetectorTest for JUnit 5

   • src/test/resources/testng/parallel.xml for TestNG

How this project is structured

Grid

In the grid folder we will see two files: * docker-compose.yml * config.toml

General

Configuration

The general.properties file has basic common values like URL, timeout, and headless execution. The grid.properties file has the url and port of the grid, to configure it.

Normally we add those values in the properties files to easily. You can change these values running the test using a CI/CD tool.

The class Configuration has all the bindings to the properties file, where the ConfigurationManager is responsible to load it. To make this happen the Owner library is in use.

Browser Factory

The BrowserFactory class is an enumeration that returns the browser options. These driver options are used in the TargetFactory which will create a remote execution using the selected browser. The DriverManager adds the driver in a thread to avoid concurrency issues.

Both BaseWeb classes, placed in the test package use the TargetFactory to create the remote browser instance for the test execution.

driver=new TargetFactory().createInstance(browser);

Using TestNG to run multi-browser parallel tests

The TestNG tests are located at src/test/java/com.eliasnogueira.testng and they are composed by:

• BaseWeb: base test class which has the pre and post-test conditions to create the browser instance and quit it

• BrowserDetectorTest: test run a parameterized test based on the implemented browsers

How TestNG runs the tests in parallel

TestNG has a built-in feature to run parallel tests using a test suite, which is an XML file to group different tests for execution. The parallel attribute of the <suite> tag is the indication of what should be run in parallel.

The BaseWeb class has a pre-condition that will match the required parameter with the parameter set by each test in the src/test/java/resources/testng/parallel.xml file.

Using JUnit to run multi-browser tests in parallel

The JUnit 5 tests are located at src/test/java/com.eliasnogueira.junit and they are composed by:

• BaseWeb: base test class which has the post-test condition to quit the browser and a method to create the browser instance which will be used by the test

• MultiBrowserDetectorTest: test run a parameterized test based on the implemented browsers

How JUnit run the tests in parallel

We know that the MultiBrowserDetectorTest will run the test for each browser present in the BrowserFactory class.

The file junit-platform.properties has configurations set to run the tests in parallel, in a concurrent mode, and with a fixed number of parallel tests. You can take a look at the file to see the configurations set.