js: First testing and improvements

--

* Introduced Mocha/chai as testsuite. After development build
  'npm test' should run the unit tests. Functionality exclusive to
  Browsers/WebExtensions cannot be run this way, so some other testing
  is still needed.

  - package.json: Added required development packages
  - .babelrc indirect configuration for mocha. ES6 transpiling
    needs some babel configuration, but mocha has no setting for it.
  - test/mocha.opts Vonfiguration for mocha runs

* Fixed errors:
  - Helpers.js toKeyIdArray; isLongId is now exported
  - Key.js Key constructor failed
  - Message.js will not throw an Error during construction, a new
    message is now created with createMessage, which can return an
    Error or a GPGME_Message object

* Tests:
  - test/Helpers: exports from Helpers.js, GPGME_Error handling
  - test/Message: first init test with bad parameters

1 files changed, 9 insertions, 6 deletions

diff --git a/lang/js/src/Key.js b/lang/js/src/Key.js
index f6fa7ae3..0b44b245 100644
--- a/lang/js/src/Key.js
+++ b/lang/js/src/Key.js
@@ -26,9 +26,9 @@
  *
  */
 
-import {isFingerprint} from './Helpers'
-import {gpgme_error} from './Errors'
-import { GPGME_Message } from './Message';
+import { isFingerprint } from './Helpers'
+import { gpgme_error } from './Errors'
+import { createMessage } from './Message';
 import { permittedOperations } from './permittedOperations';
 
 export class GPGME_Key {
@@ -39,7 +39,7 @@ export class GPGME_Key {
 
     set fingerprint(fpr){
         if (isFingerprint(fpr) === true && !this._fingerprint){
-            this._fingerprint = fingerprint;
+            this._fingerprint = fpr;
         }
     }
 
@@ -181,9 +181,12 @@ function checkKey(fingerprint, property){
     }
     return new Promise(function(resolve, reject){
         if (!isFingerprint(fingerprint)){
-            reject('KEY_INVALID');
+            reject(gpgme_error('KEY_INVALID'));
+        }
+        let msg = createMessage ('keyinfo');
+        if (msg instanceof Error){
+            reject(gpgme_error('PARAM_WRONG'));
         }
-        let msg = new GPGME_Message('keyinfo');
         msg.setParameter('fingerprint', this.fingerprint);
         return (this.connection.post(msg)).then(function(result){
             if (result.hasOwnProperty(property)){