Add enumerate function.

Author: colonelpopcorn

lib/virtualbox.js

@@ -1,5 +1,7 @@
 'use strict';
 
+const { stderr } = require('process');
+
 const execFile = require('child_process').execFile,
   log4js = require('log4js'),
   host_platform = process.platform,
@@ -85,7 +87,8 @@ class Virtualbox {
   }
 
   static create(logging, executor) {
-    return new Virtualbox({ ...defaultLoggingConfig, ...logging }, executor);
+    const logger = !!logging ? logging : defaultLogger;
+    return new Virtualbox(logger, executor);
   }
 
   vboxmanage = defaultvboxmanage;
@@ -639,6 +642,15 @@ class VboxGuestProperty {
       this._logging.info('Could not showvminfo for %s', vmname);
     }
   }
+
+  enumerate(vmname, callback) {
+    this.vboxmanage(
+      ['guestproperty', 'enumerate', vmname],
+      (err, stdout, stderr) => {
+        callback(err, stdout, stderr);
+      }
+    );
+  }
 }
 
 class VboxExtraData {

test/integration/guestproperty-enumerate.js

@@ -0,0 +1,12 @@
+'use strict';
+
+const virtualbox = require('../../lib/virtualbox'),
+  vm = 'node-virtualbox-test-machine';
+
+virtualbox.guestproperty.enumerate(vm, (error, stdout, stderr) => {
+  if (error) {
+    throw error;
+  }
+  console.log(error, stdout, stderr);
+  console.log(stdout);
+});