• maven-dependency-plugin - This will copy all the project dependencies to the specified directory.
• maven-jar-plugin - This will create the jar file for the project.
• maven-resources-plugin - This will copy all the resources to specified directory

To package the jar and skip all the tests.

mvn clean package -DskipTests

In our case, all the dependencies jar and application jar file will be moved to target/docker-resources/libs directory.

Specify the files in the resource tag under maven-resources-plugin inside pom.xml.

<resource>
    <directory>.</directory>
    <includes>
        <include>dummy.txt</include>
    </includes>
</resource>

• Running a test suite.

  java -cp 'libs/*' org.testng.TestNG test-suites/vendor-portal.xml

• Running a test suite with specific thread count.

  java -cp 'libs/*' org.testng.TestNG -threadcount 2 test-suites/vendor-portal.xml

  This will override the thread-count mentioned in the xml file.

• TestNG by default created test-output directory. You can change it with -d option.

  java -cp 'libs/*' org.testng.TestNG -d result test-suites/vendor-portal.xml

• To pass the browser option.

  java -Dbrowser=chrome -cp 'libs/*' org.testng.TestNG test-suites/flight-reservation.xml

• To run the test using selenium grid.

  java -Dselenium.grid.enabled=true -Dselenium.grid.hubHost=localhost -cp 'libs/*' org.testng.TestNG test-suites/flight-reservation.xml

FROM bellsoft/liberica-openjdk-alpine:17.0.10

# create a workspace
WORKDIR /home/selenium-docker

# Add required files
COPY target/docker-resources ./

Build the Docker Image

docker build -t blitzstriker/selenium .

Create a docker container

docker run -it -v ${PWD}/result:/home/selenium-docker/test-output blitzstriker/selenium

Run tests inside container

java -Dselenium.grid.enabled=true -Dselenium.grid.hubHost=<System_ip> -cp 'libs/*' org.testng.TestNG test-suites/vendor-portal.xml

FROM bellsoft/liberica-openjdk-alpine:17.0.10

# create a workspace
WORKDIR /home/selenium-docker

# Add required files
COPY target/docker-resources ./

# Environment Variables
# BROWSER
# HUB_HOST
# TEST_SUITE
# THREAD_COUNT

# Run the tests
ENTRYPOINT java -cp 'libs/*' \
            -Dselenium.grid.enabled=true -Dselenium.grid.hubHost=${HUB_HOST} -Dbrowser=${BROWSER} \
            org.testng.TestNG -threadcount ${THREAD_COUNT} \
            test-suites/${TEST_SUITE}

docker run -e BROWSER=chrome -e HUB_HOST=<system_ip> -e TEST_SUITE=vendor-portal.xml -e THREAD_COUNT=3 blitzstriker/selenium

Remove unused images and containers

docker system prune -f

Add the below service in docker-compose.yml file.

  vendor-portal:
    image: blitzstriker/selenium-java-docker
    depends_on:
      - chrome
    environment:
      - BROWSER=chrome
      - HUB_HOST=hub
      - THREAD_COUNT=3
      - TEST_SUITE=vendor-portal.xml
    volumes:
      - ./output/vendor-portal:/home/selenium-docker/test-output

Checking Selenium Grid Status

curl -s http://localhost:4444/status | jq .value.ready

Adding curl and jq to docker image

Update the Dockerfile

FROM bellsoft/liberica-openjdk-alpine:17.0.10

# Install curl and jq
RUN apk add curl jq

...
...

We will create a runner.sh file which will check for the Selenium Grid status to be ready. Once it is ready, it will run the tests.

Update the Dockerfile as below:

FROM bellsoft/liberica-openjdk-alpine:17.0.10

# Install curl and jq
RUN apk add curl jq

# create a workspace
WORKDIR /home/selenium-docker

# Add required files
COPY target/docker-resources ./
COPY runner.sh runner.sh

# Start the runner.sh
ENTRYPOINT sh runner.sh

Build the docker image and run the test with docker compose

docker compose up -d 

Summary

1. Package the application

   mvn clean package -DskipTests

2. Build docker image

   docker build -t blitzstriker/selenium .

3. Run docker container

   docker compose up