pipeline {
  agent none
  stage('Tests') {
    when { branch 'declarative-pipeline' }
    parallel {
      stage('One') {
        agent any
        steps {
          lock(resource: "${env.JOB_NAME}/10", inversePrecedence: true) {
            milestone  10
            node() {
              deleteDir()
              execute tests
            }
          }
        }
      }
    }
  }
}