py_test/Jenkinsfile

pipeline {
    agent any

    stages {
        stage('Checkout') {
            steps {
                checkout scm
            }
        }

        stage('Build Image') {
            steps {
                echo 'Building image...'
                // --pull ensures base layer is fresh; tag includes BUILD_NUMBER to avoid cache clashes
                sh 'docker build --pull -t my-python-app:${BUILD_NUMBER} .'
            }
        }

        stage('Run Container') {
            steps {
                echo 'Running container...'
                // --rm cleans up; this will print "Hello, World!" to the console
                sh 'docker run --rm --name my-python-app-${BUILD_NUMBER} my-python-app:${BUILD_NUMBER}'
            }
        }

        stage('(Optional) Verify Output') {
            steps {
                script {
                    // Re-run capturing output to assert expected behavior (example)
                    def out = sh(
            script: 'docker run --rm my-python-app:${BUILD_NUMBER}',
            returnStdout: true
          ).trim()
                    if (out != 'Hello, World!') {
                        error "Unexpected output: '${out}'"
                    }
                }
            }
        }
    }

    post {
        always {
            // Best-effort cleanup of any leftover container/image for this build tag
            sh '''
        docker rm -f my-python-app-${BUILD_NUMBER} 2>/dev/null || true
        docker image rm my-python-app:${BUILD_NUMBER} 2>/dev/null || true
      '''
        }
    }
}