Test Automation with Jenkins

Jenkins test automation tutorial

Nowadays, Test automation has become a cornerstone in ensuring the quality and reliability of software products. Among the various tools available for test automation, Jenkins stands out as a powerful and versatile automation server. This comprehensive article will explore the complexities of test automation with Jenkins, exploring its features, benefits, and how it can streamline your testing processes.

Table of contents

• What is Jenkins test automation?
• When to use Jenkins for test automation?
  • Regression testing in a web application
  • Mobile application testing across multiple devices
  • Integration testing in Microservices architecture
  • Load testing for scalability assessment
• How to integrate test automation in Jenkins
  • Integrate Jenkins with Git
  • Job configurations to run automated tests in Jenkins
  • Execute the Jenkins job
• Additional tools for Jenkins test automation
  • Docker
  • Selenium Grid
  • Configuration as Code
  • Pipeline as Code
• Conclusion

What is Jenkins test automation?

Jenkins is a universal automation server and orchestration tool that is the base for your complete CI/CD workflow. Jenkins Test Automation refers to the integration of Jenkins, an open-source automation server, into the process of automating and managing the execution of test cases for software applications.

It is compatible with numerous test frameworks, plugins, and other automation tools, making it a perfect dedicated execution platform for developing and running comprehensive test automation.

When to use Jenkins for test automation?

Let’s explore more practical and real-world scenarios where using Jenkins for test automation is favorable, along with additional details for each scenario:

Regression testing in a web application

Scenario

Your team is working on a web application with frequent updates and enhancements. Regression testing, which involves verifying that new changes do not break existing functionality, is crucial.

How Jenkins helps

Jenkins can be configured to trigger regression test suites automatically whenever new code changes are pushed to the version control system. Using tools like Selenium, Jenkins facilitates the execution of detailed regression tests, including UI and functional tests.

Automated regression testing ensures that existing features remain intact, and Jenkins provides detailed reports on test outcomes, highlighting any regressions that may have been introduced.

Mobile application testing across multiple devices

Scenario

Your project involves developing a mobile application that needs to be tested on various devices and operating systems to ensure broad compatibility.

How Jenkins helps

Jenkins can manage and execute mobile test suites across different devices and platforms. Leveraging tools like Appium and Jenkins enables parallel execution of mobile tests on emulators or real devices. It also facilitates the configuration of device farms, allowing for comprehensive coverage of various device configurations.

Detailed logs and reports generated by Jenkins provide insights into the performance and compatibility of the mobile application across different environments.

Integration testing in Microservices architecture

Scenario

Your software architecture is based on microservices, and you need to perform integration testing to ensure seamless communication between microservices.

How Jenkins helps

Jenkins can be configured to orchestrate integration tests across multiple microservices. Each microservice’s test suite can be triggered independently, and Jenkins ensures that integration tests are executed in the correct order to simulate real-world interactions.

Detailed logs and reports help identify any issues related to the integration of microservices, enabling developers to address them promptly.

Load testing for scalability assessment

Scenario

Your application is expected to handle various users, and you need to assess its scalability and performance under different load conditions.

How Jenkins helps

Jenkins integrates with load testing tools like JMeter or Gatling to automate the execution of load tests. Scheduled Jenkins jobs simulate various user loads, helping your team identify performance bottlenecks and assess the application’s scalability.

Jenkins provides comprehensive reports on response times, error rates, and system resource usage during load tests, enabling data-driven decisions for optimizing application performance.

Release candidate verification

Scenario

Before deploying a new release, you want to ensure that the release candidate has undergone thorough testing to minimize the risk of post-release issues.

How Jenkins helps

Jenkins can be configured to trigger a comprehensive set of tests when a release candidate is prepared. This includes unit tests, integration tests, and any other relevant tests. Jenkins provides a holistic view of the test results, including code coverage metrics and test pass/fail statuses.

The detailed reports assist the development and QA teams in making informed decisions about the readiness of the release candidate for deployment.

How to integrate test automation in Jenkins

Integrate Jenkins with Git

If you want Jenkins to build or run an application, Jenkins must be connected to a SCM system like Git.

Note:
You can refer to this demo GitHub repository, which can be cloned for your practice.

Log in to Jenkins and navigate to Manage Jenkins > System tab.

On the System page, navigate to the GitHub tab.

Under GitHub Servers, click on Add GitHub Server and then select GitHub Server.

Enter the Name and API URL. Then, click the Add button under Credentials if your URL needs a valid credential.

Note:
API URL means the API endpoint of a GitHub server. To use public github.com, leave this field to the default value of https://api.github.com. Otherwise, if you use GitHub Enterprise, specify its API endpoint here (e.g., https://ghe.acme.com/api/v3/).

Select the newly added credential, and lastly, click the Save button to save the Jenkins Git integration setup.

Job configuration to run automated tests in Jenkins

To run automated tests in Jenkins, you must create a job first. You have to click on New Item from the Jenkins dashboard for this.

Next, enter the Job name, select the Job type as Freestyle project, and click the OK button.

After that, the new job will be added, which must be configured by selecting the GitHub project checkbox and entering the root URL of the Git repository in the Project url tab.

You must specify the Repository URL by selecting the Git radio button under the Source Code Management section.

The next step is to add the Build Step, and as the project used for this example is of type Maven, that’s why select the Invoke top-level Maven targets option under the Add build step.

Then, put the Maven command under Goals. Here, in this case, it will be clean verify.

Lastly, save the Job configuration by clicking on the Save button.

Execute the Jenkins job

To execute the job, click the Build Now button to trigger a new build.

Once the build is done, you can see the console output or the HTML report (if configured) by clicking the Build number. (Here, it is #7)

Additional tools for Jenkins test automation

In addition to Git integration for source code management, Jenkins can be enhanced with additional tools to improve automation testing workflows. Below is a section on other tools and plugins for Jenkins test automation.

Docker

Docker simplifies application deployment by encapsulating container code and dependencies. This promotes consistency across different environments, ensuring that tests are conducted in an isolated and reproducible environment.

To integrate Docker with Jenkins, install the Docker plugin and set up Docker in your build steps. Use Docker Compose for managing multi-container environments if needed. This approach allows you to scale your test infrastructure efficiently.

Selenium Grid

Selenium Grid enables distributed test execution, allowing parallel testing across multiple machines and browsers. This improves testing efficiency and helps identify browser-specific issues. Establish a Selenium Grid hub and nodes to integrate Selenium Grid with Jenkins.

Configure your Selenium tests to interact with the Grid by specifying the hub’s URL. Leverage Jenkins to dynamically allocate nodes based on the test requirements, optimizing resource utilization.

Configuration as Code (JCasC)

JCasC simplifies Jenkins configuration management, allowing you to define configuration settings as code in a version-controlled YAML file. This approach enhances reproducibility, transparency, and collaboration across teams.

To integrate JCasC with Jenkins, install the Configuration as Code plugin. Create a configuration YAML file that defines Jenkins settings. This ensures that your Jenkins configurations are stored in version control, facilitating easier management and sharing.

Pipeline as Code

Pipeline as Code enables defining Jenkins pipelines as Groovy scripts, providing version-controlled, reusable, and maintainable pipeline configurations. Utilize Jenkinsfile to declare your pipeline stages, steps, and configurations.

Integrate with version control for a collaborative development approach. Leverage Jenkins Pipeline features such as parallel execution, matrix builds, and scripted/declarative syntax based on project requirements.

Final thoughts on test automation with Jenkins

This guide provides a comprehensive overview of leveraging Jenkins for test automation. It outlines key steps and integrations to streamline and enhance continuous testing workflows. By combining Jenkins with additional tools for reporting, artifact management, performance testing, and security scanning, teams can establish a comprehensive testing infrastructure that ensures the reliability of their software.

Embracing automation and continuous integration with Jenkins enables organizations to meet the demands of modern software development.

Related articles

• How to create a Jenkins pipeline
• Managing jobs in Jenkins
• Jenkins architecture
• Jenkins-Git-SVN integration
• Jenkins vs top competitors

Jenkins test automation example