Load script from groovy script

If you don’t mind the code in file2 being in a with block, you can do:

new GroovyShell().parse( new File( 'file1.groovy' ) ).with {
  method()
}

---

Another possible method would be to change file1.groovy to:

class File1 {
  def method() {
    println "test"
  }
}

And then in file2.groovy you can use mixin to add the methods from file1

def script = new GroovyScriptEngine( '.' ).with {
  loadScriptByName( 'file1.groovy' )
} 
this.metaClass.mixin script

method()