Simple Jenkins declarative example

Jenkinsfile

pipeline {  
    agent any
    stages {
        stage('build') {
            steps {
              echo 'Running build ...'
            }
        }
        stage('test') {
            steps {
              echo 'Run tests ...'
            }
        }
    }
    post {
        always {
            echo 'Run always'
        }
        success {
            echo 'Run on success'
        }
        failure {
            echo 'Run on failure'
        }
    }
}