How do you automate testing with Jenkins pipelines Can you provide a Jenkinsfile example that integrates unit integration and end-to-end testing stages

How do you automate testing with Jenkins pipelines? Can you provide a Jenkinsfile example that integrates unit, integration, and end-to-end testing stages?

This question discusses how to arrange automated testing within a Jenkins pipeline so one makes sure the application under test is well verified. The target will be to identify how unit tests, integration tests, and end-to-end tests can be integrated separately into the stages of the pipeline, thus being holistically beneficial in the testing framework. Sharing an example Jenkinsfile helps illustrate best practices about setting up such pipelines.