Jenkins pipeline very simple mock steps to test things in a standalone script

jenkins-pipeline-mocks.groovy

# For a more realistic simulation see https://stackoverflow.com/questions/50165079/mocking-jenkins-pipeline-steps

def readFile( Map args ) {
  def file = args.file
  def encoding = args.file ?: 'UTF-8'

  return new File( file ).text
}

def sh( String command ) {
  println command
}

def dir( String dir, Closure code ) {
  println "cd $dir"
  code.call()
}

def echo( String msg ) {
  echo msg
}