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, 4 insertions, 3 deletions

diff --git a/lang/js/src/Helpers.js b/lang/js/src/Helpers.js
index 841c0eda..9a69f851 100644
--- a/lang/js/src/Helpers.js
+++ b/lang/js/src/Helpers.js
@@ -18,6 +18,7 @@
  * SPDX-License-Identifier: LGPL-2.1+
  */
 import { gpgme_error } from "./Errors";
+import { GPGME_Key } from "./Key";
 
 /**
  * Tries to return an array of fingerprints, either from input fingerprints or
@@ -26,7 +27,7 @@ import { gpgme_error } from "./Errors";
  * @returns {Array<String>} Array of fingerprints.
  */
 
-export function toKeyIdArray(input, nocheck){
+export function toKeyIdArray(input){
     if (!input){
         gpgme_error('MSG_NO_KEYS');
         return [];
@@ -46,7 +47,7 @@ export function toKeyIdArray(input, nocheck){
             let fpr = '';
             if (input[i] instanceof GPGME_Key){
                 fpr = input[i].fingerprint;
-            } else if (input[i].hasOwnProperty(primaryKey) &&
+            } else if (input[i].hasOwnProperty('primaryKey') &&
                 input[i].primaryKey.hasOwnProperty(getFingerprint)){
                     fpr = input[i].primaryKey.getFingerprint();
             }
@@ -92,7 +93,7 @@ export function isFingerprint(string){
 /**
  * check if the input is a valid Hex string with a length of 16
  */
-function isLongId(string){
+export function isLongId(string){
     return hextest(string, 16);
 };