diff --git a/lang/js/src/Connection.js b/lang/js/src/Connection.js
index 8a965479..923698a4 100644
--- a/lang/js/src/Connection.js
+++ b/lang/js/src/Connection.js
@@ -1,320 +1,342 @@
 /* gpgme.js - Javascript integration for gpgme
  * Copyright (C) 2018 Bundesamt für Sicherheit in der Informationstechnik
  *
  * This file is part of GPGME.
  *
  * GPGME is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
  * published by the Free Software Foundation; either version 2.1 of
  * the License, or (at your option) any later version.
  *
  * GPGME is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this program; if not, see <https://www.gnu.org/licenses/>.
  * SPDX-License-Identifier: LGPL-2.1+
  *
  * Author(s):
  *     Maximilian Krambach <mkrambach@intevation.de>
  */
 
 /* global chrome */
 
 import { permittedOperations } from './permittedOperations';
 import { gpgme_error } from './Errors';
 import { GPGME_Message, createMessage } from './Message';
 import { decode, atobArray, Utf8ArrayToStr } from './Helpers';
 
 /**
  * A Connection handles the nativeMessaging interaction via a port. As the
  * protocol only allows up to 1MB of message sent from the nativeApp to the
  * browser, the connection will stay open until all parts of a communication
  * are finished. For a new request, a new port will open, to avoid mixing
  * contexts.
  * @class
  * @private
  */
 export class Connection{
 
     constructor (){
+        this._connectionError = null;
         this._connection = chrome.runtime.connectNative('gpgmejson');
+        this._connection.onDisconnect.addListener(() => {
+            if (chrome.runtime.lastError) {
+                this._connectionError = chrome.runtime.lastError.message;
+            } else {
+                this._connectionError = 'Disconnected without error message';
+            }
+        });
     }
 
     /**
      * Immediately closes an open port.
      */
     disconnect () {
         if (this._connection){
             this._connection.disconnect();
             this._connection = null;
+            this._connectionError = 'Disconnect requested by gpgmejs';
         }
     }
 
+    /**
+     * Checks if the connection terminated with an error state
+     */
+    get isDisconnected (){
+        return this._connectionError !== null;
+    }
 
     /**
     * @typedef {Object} backEndDetails
     * @property {String} gpgme Version number of gpgme
     * @property {Array<Object>} info Further information about the backend
     * and the used applications (Example:
     * <pre>
     * {
     *          "protocol":     "OpenPGP",
     *          "fname":        "/usr/bin/gpg",
     *          "version":      "2.2.6",
     *          "req_version":  "1.4.0",
     *          "homedir":      "default"
     * }
     * </pre>
     */
 
     /**
      * Retrieves the information about the backend.
      * @param {Boolean} details (optional) If set to false, the promise will
      *  just return if a connection was successful.
      * @param {Number} timeout (optional)
      * @returns {Promise<backEndDetails>|Promise<Boolean>} Details from the
      * backend
      * @async
      */
     checkConnection (details = true, timeout = 1000){
         if (typeof timeout !== 'number' && timeout <= 0) {
             timeout = 1000;
         }
         const msg = createMessage('version');
         if (details === true) {
             return this.post(msg);
         } else {
             let me = this;
             return new Promise(function (resolve) {
                 Promise.race([
                     me.post(msg),
                     new Promise(function (resolve, reject){
                         setTimeout(function (){
                             reject(gpgme_error('CONN_TIMEOUT'));
                         }, timeout);
                     })
                 ]).then(function (){ // success
                     resolve(true);
                 }, function (){ // failure
                     resolve(false);
                 });
             });
         }
     }
 
     /**
      * Sends a {@link GPGME_Message} via the nativeMessaging port. It
      * resolves with the completed answer after all parts have been
      * received and reassembled, or rejects with an {@link GPGME_Error}.
      *
      * @param {GPGME_Message} message
      * @returns {Promise<*>} The collected answer, depending on the messages'
      * operation
      * @private
      * @async
      */
     post (message){
         if (!message || !(message instanceof GPGME_Message)){
             this.disconnect();
             return Promise.reject(gpgme_error(
                 'PARAM_WRONG', 'Connection.post'));
         }
         if (message.isComplete() !== true){
             this.disconnect();
             return Promise.reject(gpgme_error('MSG_INCOMPLETE'));
         }
+        if (this.isDisconnected) {
+            if ( this.isNativeHostUnknown === true) {
+                return Promise.reject(gpgme_error('CONN_NO_CONFIG'));
+            } else {
+                return Promise.reject(gpgme_error(
+                    'CONN_NO_CONNECT', this._connectionError));
+            }
+        }
         let chunksize = message.chunksize;
         const me = this;
-        return new Promise(function (resolve, reject){
+        const nativeCommunication = new Promise(function (resolve, reject){
             let answer = new Answer(message);
             let listener = function (msg) {
                 if (!msg){
                     me._connection.onMessage.removeListener(listener);
                     me._connection.disconnect();
                     reject(gpgme_error('CONN_EMPTY_GPG_ANSWER'));
                 } else {
                     let answer_result = answer.collect(msg);
                     if (answer_result !== true){
                         me._connection.onMessage.removeListener(listener);
                         me._connection.disconnect();
                         reject(answer_result);
                     } else {
                         if (msg.more === true){
                             me._connection.postMessage({
                                 'op': 'getmore',
                                 'chunksize': chunksize
                             });
                         } else {
                             me._connection.onMessage.removeListener(listener);
                             me._connection.disconnect();
                             const message = answer.getMessage();
                             if (message instanceof Error){
                                 reject(message);
                             } else {
                                 resolve(message);
                             }
                         }
                     }
                 }
             };
             me._connection.onMessage.addListener(listener);
-            if (permittedOperations[message.operation].pinentry){
-                return me._connection.postMessage(message.message);
-            } else {
-                return Promise.race([
-                    me._connection.postMessage(message.message),
-                    function (resolve, reject){
-                        setTimeout(function (){
-                            me._connection.disconnect();
-                            reject(gpgme_error('CONN_TIMEOUT'));
-                        }, 5000);
-                    }
-                ]).then(function (result){
-                    return result;
-                }, function (reject){
-                    if (!(reject instanceof Error)) {
-                        me._connection.disconnect();
-                        return gpgme_error('GNUPG_ERROR', reject);
-                    } else {
-                        return reject;
-                    }
-                });
-            }
+            me._connection.postMessage(message.message);
         });
+        if (permittedOperations[message.operation].pinentry === true) {
+            return nativeCommunication;
+        } else {
+            return Promise.race([
+                nativeCommunication,
+                new Promise(function (resolve, reject){
+                    setTimeout(function (){
+                        me._connection.disconnect();
+                        reject(gpgme_error('CONN_TIMEOUT'));
+                    }, 5000);
+                })
+            ]);
+        }
     }
 }
 
 
 /**
  * A class for answer objects, checking and processing the return messages of
  * the nativeMessaging communication.
  * @private
  */
 class Answer{
 
     /**
      * @param {GPGME_Message} message
      */
     constructor (message){
         this._operation = message.operation;
         this._expected = message.expected;
         this._response_b64 = null;
     }
 
     get operation (){
         return this._operation;
     }
 
     get expected (){
         return this._expected;
     }
 
+    /**
+     * Checks if an error matching browsers 'host not known' messages occurred
+     */
+    get isNativeHostUnknown () {
+        return this._connectionError === 'Specified native messaging host not found.';
+    }
+
     /**
      * Adds incoming base64 encoded data to the existing response
      * @param {*} msg base64 encoded data.
      * @returns {Boolean}
      *
      * @private
      */
     collect (msg){
         if (typeof (msg) !== 'object' || !msg.hasOwnProperty('response')) {
             return gpgme_error('CONN_UNEXPECTED_ANSWER');
         }
         if (!this._response_b64){
             this._response_b64 = msg.response;
             return true;
         } else {
             this._response_b64 += msg.response;
             return true;
         }
     }
     /**
      * Decodes and verifies the base64 encoded answer data. Verified against
      * {@link permittedOperations}.
      * @returns {Object} The readable gpnupg answer
      */
     getMessage (){
         if (this._response_b64 === null){
             return gpgme_error('CONN_UNEXPECTED_ANSWER');
         }
         let _decodedResponse = JSON.parse(atob(this._response_b64));
         let _response = {
             format: 'ascii'
         };
         let messageKeys = Object.keys(_decodedResponse);
         let poa = permittedOperations[this.operation].answer;
         if (messageKeys.length === 0){
             return gpgme_error('CONN_UNEXPECTED_ANSWER');
         }
         for (let i= 0; i < messageKeys.length; i++){
             let key = messageKeys[i];
             switch (key) {
             case 'type': {
                 if (_decodedResponse.type === 'error'){
                     return (gpgme_error('GNUPG_ERROR',
                         decode(_decodedResponse.msg)));
                 } else if (poa.type.indexOf(_decodedResponse.type) < 0){
                     return gpgme_error('CONN_UNEXPECTED_ANSWER');
                 }
                 break;
             }
             case 'base64': {
                 break;
             }
             case 'msg': {
                 if (_decodedResponse.type === 'error'){
                     return (gpgme_error('GNUPG_ERROR', _decodedResponse.msg));
                 }
                 break;
             }
             default: {
                 let answerType = null;
                 if (poa.payload && poa.payload.hasOwnProperty(key)){
                     answerType = 'p';
                 } else if (poa.info && poa.info.hasOwnProperty(key)){
                     answerType = 'i';
                 }
                 if (answerType !== 'p' && answerType !== 'i'){
                     return gpgme_error('CONN_UNEXPECTED_ANSWER');
                 }
 
                 if (answerType === 'i') {
                     if ( typeof (_decodedResponse[key]) !== poa.info[key] ){
                         return gpgme_error('CONN_UNEXPECTED_ANSWER');
                     }
                     _response[key] = decode(_decodedResponse[key]);
 
                 } else if (answerType === 'p') {
                     if (_decodedResponse.base64 === true
                         && poa.payload[key] === 'string'
                     ) {
                         if (this.expected === 'uint8'){
                             _response[key] = atobArray(_decodedResponse[key]);
                             _response.format = 'uint8';
 
                         } else if (this.expected === 'base64'){
                             _response[key] = _decodedResponse[key];
                             _response.format = 'base64';
 
                         } else { // no 'expected'
                             _response[key] = Utf8ArrayToStr(
                                 atobArray(_decodedResponse[key]));
                             _response.format = 'string';
                         }
                     } else if (poa.payload[key] === 'string') {
                         _response[key] = _decodedResponse[key];
                     } else {
                         // fallthrough, should not be reached
                         // (payload is always string)
                         return gpgme_error('CONN_UNEXPECTED_ANSWER');
                     }
                 }
                 break;
             } }
         }
         return _response;
     }
 }
diff --git a/lang/js/src/Errors.js b/lang/js/src/Errors.js
index bf52cce7..6189414f 100644
--- a/lang/js/src/Errors.js
+++ b/lang/js/src/Errors.js
@@ -1,177 +1,185 @@
 /* gpgme.js - Javascript integration for gpgme
  * Copyright (C) 2018 Bundesamt für Sicherheit in der Informationstechnik
  *
  * This file is part of GPGME.
  *
  * GPGME is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
  * published by the Free Software Foundation; either version 2.1 of
  * the License, or (at your option) any later version.
  *
  * GPGME is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this program; if not, see <https://www.gnu.org/licenses/>.
  * SPDX-License-Identifier: LGPL-2.1+
  *
  * Author(s):
  *     Maximilian Krambach <mkrambach@intevation.de>
  */
 
 /**
  * Listing of all possible error codes and messages of a {@link GPGME_Error}.
  */
 export const err_list = {
     // Connection
     'CONN_NO_CONNECT': {
         msg:'Connection with the nativeMessaging host could not be'
             + ' established.',
         type: 'error'
     },
     'CONN_EMPTY_GPG_ANSWER':{
         msg: 'The nativeMessaging answer was empty.',
         type: 'error'
     },
+    'CONN_NO_CONFIG':{
+        msg: 'The browser does not recognize the nativeMessaging host.',
+        type: 'error'
+    },
+    'CONN_NATIVEMESSAGE':{
+        msg: 'The native messaging was not successful.',
+        type: 'error'
+    },
     'CONN_TIMEOUT': {
         msg: 'A connection timeout was exceeded.',
         type: 'error'
     },
     'CONN_UNEXPECTED_ANSWER': {
         msg: 'The answer from gnupg was not as expected.',
         type: 'error'
     },
     'CONN_ALREADY_CONNECTED':{
         msg: 'A connection was already established.',
         type: 'warning'
     },
     // Message/Data
     'MSG_INCOMPLETE': {
         msg: 'The Message did not match the minimum requirements for'
             + ' the interaction.',
         type: 'error'
     },
     'MSG_EMPTY' : {
         msg: 'The Message is empty.',
         type: 'error'
     },
     'MSG_WRONG_OP': {
         msg: 'The operation requested could not be found',
         type: 'error'
     },
     'MSG_NO_KEYS' : {
         msg: 'There were no valid keys provided.',
         type: 'warning'
     },
     'MSG_NOT_A_FPR': {
         msg: 'The String is not an accepted fingerprint',
         type: 'warning'
     },
     'KEY_INVALID': {
         msg:'Key object is invalid',
         type: 'error'
     },
     'KEY_NOKEY': {
         msg:'This key does not exist in GPG',
         type: 'error'
     },
     'KEY_NO_INIT': {
         msg:'This property has not been retrieved yet from GPG',
         type: 'error'
     },
     'KEY_ASYNC_ONLY': {
         msg: 'This property cannot be used in synchronous calls',
         type: 'error'
     },
     'KEY_NO_DEFAULT': {
         msg:'A default key could not be established. Please check yout gpg ' +
             'configuration',
         type: 'error'
     },
     'SIG_WRONG': {
         msg:'A malformed signature was created',
         type: 'error'
     },
     'SIG_NO_SIGS': {
         msg:'There were no signatures found',
         type: 'error'
     },
     // generic
     'PARAM_WRONG':{
         msg: 'Invalid parameter was found',
         type: 'error'
     },
     'DECODE_FAIL': {
         msg: 'Decoding failed due to unexpected data',
         type: 'error'
     },
     'PARAM_IGNORED': {
         msg: 'An parameter was set that has no effect in gpgmejs',
         type: 'warning'
     },
     'GENERIC_ERROR': {
         msg: 'Unspecified error',
         type: 'error'
     }
 };
 
 /**
  * Checks the given error code and returns an {@link GPGME_Error} error object
  * with some information about meaning and origin
  * @param {String} code Error code as defined in {@link err_list}.
  * @param {String} info Possible additional error message to pass through.
  * Currently used for errors sent as answer by gnupg via a native Message port
  * @returns {GPGME_Error}
  */
 export function gpgme_error (code = 'GENERIC_ERROR', info){
     if (err_list.hasOwnProperty(code)){
         if (err_list[code].type === 'error'){
             return new GPGME_Error(code);
         }
         if (err_list[code].type === 'warning'){
             // eslint-disable-next-line no-console
             // console.warn(code + ': ' + err_list[code].msg);
         }
         return null;
     } else if (code === 'GNUPG_ERROR'){
         return new GPGME_Error(code, info);
     }
     else {
         return new GPGME_Error('GENERIC_ERROR');
     }
 }
 
 /**
  * An error class with additional info about the origin of the error, as string
  * It is created by {@link gpgme_error}, and its' codes are defined in
  * {@link err_list}.
  *
  * @property {String} code Short description of origin and type of the error
  * @property {String} msg Additional info
  * @protected
  * @class
  * @extends Error
  */
 class GPGME_Error extends Error{
     constructor (code = 'GENERIC_ERROR', msg=''){
-
-        if (code === 'GNUPG_ERROR' && typeof (msg) === 'string'){
+        const verboseErrors = ['GNUPG_ERROR', 'CONN_NATIVEMESSAGE'];
+        if (verboseErrors.includes(code) && typeof (msg) === 'string'){
             super(msg);
         } else if (err_list.hasOwnProperty(code)){
             if (msg){
                 super(err_list[code].msg + '--' + msg);
             } else {
                 super(err_list[code].msg);
             }
         } else {
             super(err_list['GENERIC_ERROR'].msg);
         }
         this._code = code;
     }
 
     get code (){
         return this._code;
     }
 }
\ No newline at end of file
diff --git a/lang/js/src/index.js b/lang/js/src/index.js
index 106086fb..3c31a047 100644
--- a/lang/js/src/index.js
+++ b/lang/js/src/index.js
@@ -1,58 +1,68 @@
 /* gpgme.js - Javascript integration for gpgme
  * Copyright (C) 2018 Bundesamt für Sicherheit in der Informationstechnik
  *
  * This file is part of GPGME.
  *
  * GPGME is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
  * published by the Free Software Foundation; either version 2.1 of
  * the License, or (at your option) any later version.
  *
  * GPGME is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this program; if not, see <https://www.gnu.org/licenses/>.
  * SPDX-License-Identifier: LGPL-2.1+
  *
  * Author(s):
  *     Maximilian Krambach <mkrambach@intevation.de>
  */
 
 
 import { GpgME } from './gpgmejs';
 import { gpgme_error } from './Errors';
 import { Connection } from './Connection';
 
 /**
  * Main entry point for gpgme.js. It initializes by testing the nativeMessaging
  * connection once, and then offers the available functions as method of the
  * response object.
  * An unsuccessful attempt will reject as a GPGME_Error.
  * @param {Object} config (optional) configuration options
  * @param {Number} config.timeout set the timeout for the initial connection
- * check. On some machines and operating systems a default timeout of 500 ms is
+ * check. On some machines and operating systems a default timeout of 1000 ms is
  * too low, so a higher number might be attempted.
  * @returns {Promise<GpgME>}
  * @async
  */
 function init ({ timeout = 1000 } = {}){
     return new Promise(function (resolve, reject){
         const connection = new Connection;
         connection.checkConnection(false, timeout).then(
             function (result){
                 if (result === true) {
                     resolve(new GpgME());
                 } else {
-                    reject(gpgme_error('CONN_NO_CONNECT'));
+                    if (connection._connectionError) {
+                        if (connection.isNativeHostUnknown){
+                            reject(gpgme_error('CONN_NO_CONFIG'));
+                        } else {
+                            reject(gpgme_error('CONN_NATIVEMESSAGE',
+                                connection._connectionError)
+                            );
+                        }
+                    } else {
+                        reject(gpgme_error('CONN_TIMEOUT'));
+                    }
                 }
             }, function (){ // unspecific connection error. Should not happen
                 reject(gpgme_error('CONN_NO_CONNECT'));
             });
     });
 }
 
 const exportvalue = { init:init };
 export default exportvalue;
\ No newline at end of file
diff --git a/lang/js/unittests.js b/lang/js/unittests.js
index 414d18d1..45e2b93c 100644
--- a/lang/js/unittests.js
+++ b/lang/js/unittests.js
@@ -1,386 +1,418 @@
 /* gpgme.js - Javascript integration for gpgme
  * Copyright (C) 2018 Bundesamt für Sicherheit in der Informationstechnik
  *
  * This file is part of GPGME.
  *
  * GPGME is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
  * published by the Free Software Foundation; either version 2.1 of
  * the License, or (at your option) any later version.
  *
  * GPGME is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this program; if not, see <https://www.gnu.org/licenses/>.
  * SPDX-License-Identifier: LGPL-2.1+
  */
 
 import './node_modules/mocha/mocha'; /* global mocha, it, describe*/
 import './node_modules/chai/chai';/* global chai*/
 import { helper_params as hp } from './unittest_inputvalues';
 import { message_params as mp } from './unittest_inputvalues';
 import { whatever_params as wp } from './unittest_inputvalues';
 import { key_params as kp } from './unittest_inputvalues';
 import { Connection } from './src/Connection';
 import { gpgme_error, err_list } from './src/Errors';
 import { toKeyIdArray , isFingerprint } from './src/Helpers';
 import { createKey } from './src/Key';
 import { GPGME_Keyring } from './src/Keyring';
 import { GPGME_Message, createMessage } from './src/Message';
 
 mocha.setup('bdd');
 const expect = chai.expect;
 chai.config.includeStack = true;
 const connectionTimeout = 2000;
 
 function unittests (){
     describe('Connection testing', function (){
 
         it('Connecting', function (done) {
             let conn0 = new Connection;
             conn0.checkConnection(true, connectionTimeout).then(
                 function (answer) {
                     expect(answer).to.not.be.empty;
                     expect(answer.gpgme).to.not.be.undefined;
                     expect(answer.gpgme).to.be.a('string');
                     expect(answer.info).to.be.an('Array');
                     expect(conn0.disconnect).to.be.a('function');
                     expect(conn0.post).to.be.a('function');
+                    expect(conn0.isDisconnected).to.be.false;
                     done();
                 });
 
         });
 
+        it('Simple connection check', function (done) {
+            let conn0 = new Connection;
+            conn0.checkConnection(false, connectionTimeout).then(
+                function (answer) {
+                    expect(answer).to.be.true;
+                    expect(conn0.isDisconnected).to.be.false;
+                    done();
+                });
+        });
+
+        it('Connection check with backend information', function (done) {
+            let conn0 = new Connection;
+            conn0.checkConnection(true, connectionTimeout).then(
+                function (answer) {
+                    expect(answer).to.be.an('Object');
+                    expect(answer.gpgme).to.be.a('String');
+                    expect(answer.info).to.be.an('Array');
+                    expect(answer.info.length).to.be.above(0);
+                    for (const item of answer.info) {
+                        expect(item).to.have.property('protocol');
+                        expect(item).to.have.property('fname');
+                        expect(item).to.have.property('version');
+                        expect(item).to.have.property('req_version');
+                        expect(item).to.have.property('homedir');
+                    }
+                    expect(conn0.isDisconnected).to.be.false;
+                    done();
+                });
+        });
+
         it('Disconnecting', function (done) {
             let conn0 = new Connection;
             conn0.checkConnection(false, connectionTimeout).then(
                 function (answer) {
                     expect(answer).to.be.true;
                     conn0.disconnect();
                     conn0.checkConnection(false, connectionTimeout).then(
                         function (result) {
                             expect(result).to.be.false;
+                            expect(conn0.isDisconnected).to.be.true;
                             done();
                         });
                 });
         });
     });
 
     describe('Error Object handling', function (){
         // TODO: new GPGME_Error codes
         it('check the Timeout error', function (){
             let test0 = gpgme_error('CONN_TIMEOUT');
 
             expect(test0).to.be.an.instanceof(Error);
             expect(test0.code).to.equal('CONN_TIMEOUT');
         });
 
         it('Error Object returns generic code if code is not listed',
             function (){
                 let test0 = gpgme_error(hp.invalidErrorCode);
 
                 expect(test0).to.be.an.instanceof(Error);
                 expect(test0.code).to.equal('GENERIC_ERROR');
             }
         );
 
         it('Warnings like PARAM_IGNORED should not return errors', function (){
             let test0 = gpgme_error('PARAM_IGNORED');
 
             expect(test0).to.be.null;
         });
     });
 
     describe('Fingerprint checking', function (){
 
         it('isFingerprint(): valid Fingerprint', function (){
             let test0  = isFingerprint(hp.validFingerprint);
 
             expect(test0).to.be.true;
         });
 
         it('isFingerprint(): invalid Fingerprints', function (){
             for (let i=0; i < hp.invalidFingerprints.length; i++){
                 let test0 = isFingerprint(hp.invalidFingerprints[i]);
 
                 expect(test0).to.be.false;
             }
         });
     });
 
     describe('toKeyIdArray() (converting input to fingerprint)', function (){
 
         it('Correct fingerprint string', function (){
             let test0 = toKeyIdArray(hp.validFingerprint);
 
             expect(test0).to.be.an('array');
             expect(test0).to.include(hp.validFingerprint);
         });
 
         it('openpgpjs-like object', function (){
             let test0 = toKeyIdArray(hp.valid_openpgplike);
 
             expect(test0).to.be.an('array').with.lengthOf(1);
             expect(test0).to.include(
                 hp.valid_openpgplike.primaryKey.getFingerprint());
         });
 
         it('Array of valid inputs', function (){
             let test0 = toKeyIdArray(hp.validKeys);
             expect(test0).to.be.an('array');
             expect(test0).to.have.lengthOf(hp.validKeys.length);
         });
 
         it('Incorrect inputs', function (){
 
             it('valid Long ID', function (){
                 let test0 = toKeyIdArray(hp.validLongId);
 
                 expect(test0).to.be.empty;
             });
 
             it('invalidFingerprint', function (){
                 let test0 = toKeyIdArray(hp.invalidFingerprint);
 
                 expect(test0).to.be.empty;
             });
 
             it('invalidKeyArray', function (){
                 let test0 = toKeyIdArray(hp.invalidKeyArray);
 
                 expect(test0).to.be.empty;
             });
 
             it('Partially invalid array', function (){
                 let test0 = toKeyIdArray(hp.invalidKeyArray_OneBad);
 
                 expect(test0).to.be.an('array');
                 expect(test0).to.have.lengthOf(
                     hp.invalidKeyArray_OneBad.length - 1);
             });
         });
     });
 
     describe('GPGME_Key', function (){
         it('Key has data after a first refresh', function (done) {
             let key = createKey(kp.validKeyFingerprint);
             key.refreshKey().then(function (key2){
                 expect(key2.get).to.be.a('function');
                 for (let i=0; i < kp.validKeyProperties.length; i++) {
                     let prop = key2.get(kp.validKeyProperties[i]);
                     expect(prop).to.not.be.undefined;
                     expect(prop).to.be.a('boolean');
                 }
                 expect(isFingerprint(key2.get('fingerprint'))).to.be.true;
                 expect(
                     key2.get('fingerprint')).to.equal(kp.validKeyFingerprint);
                 expect(
                     key2.get('fingerprint')).to.equal(key.fingerprint);
                 done();
             });
         });
 
         it('Non-cached key async data retrieval', function (done){
             let key = createKey(kp.validKeyFingerprint, true);
             key.get('can_authenticate').then(function (result){
                 expect(result).to.be.a('boolean');
                 done();
             });
         });
 
         it('Non-cached key async armored Key', function (done){
             let key = createKey(kp.validKeyFingerprint, true);
             key.get('armored').then(function (result){
                 expect(result).to.be.a('string');
                 expect(result).to.include('KEY BLOCK-----');
                 done();
             });
         });
 
         it('Non-cached key async hasSecret', function (done){
             let key = createKey(kp.validKeyFingerprint, true);
             key.get('hasSecret').then(function (result){
                 expect(result).to.be.a('boolean');
                 done();
             });
         });
 
         it('Non-cached key async hasSecret (no secret in Key)', function (done){
             let key = createKey(kp.validFingerprintNoSecret, true);
             key.get('hasSecret').then(function (result){
                 expect(result).to.be.a('boolean');
                 expect(result).to.equal(false);
                 done();
             });
         });
 
         it('Querying non-existing Key returns an error', function (done) {
             let key = createKey(kp.invalidKeyFingerprint);
             key.refreshKey().then(function (){},
                 function (error){
                     expect(error).to.be.an.instanceof(Error);
                     expect(error.code).to.equal('KEY_NOKEY');
                     done();
                 });
         });
 
         it('createKey returns error if parameters are wrong', function (){
             for (let i=0; i< 4; i++){
                 expect(function (){
                     createKey(wp.four_invalid_params[i]);
                 }).to.throw(
                     err_list.PARAM_WRONG.msg
                 );
 
             }
         });
 
     //     it('Overwriting getFingerprint does not work', function(){
     //         const evilFunction = function(){
     //             return 'bad Data';
     //         };
     //         let key = createKey(kp.validKeyFingerprint, true);
     //         expect(key.fingerprint).to.equal(kp.validKeyFingerprint);
     //         try {
     //             key.getFingerprint = evilFunction;
     //         }
     //         catch(e) {
     //             expect(e).to.be.an.instanceof(TypeError);
     //         }
     //         expect(key.fingerprint).to.equal(kp.validKeyFingerprint);
     //         expect(key.getFingerprint).to.not.equal(evilFunction);
     //     });
     });
 
     describe('GPGME_Keyring', function (){
 
         it('correct Keyring initialization', function (){
             let keyring = new GPGME_Keyring;
             expect(keyring).to.be.an.instanceof(GPGME_Keyring);
             expect(keyring.getKeys).to.be.a('function');
         });
 
         it('Loading Keys from Keyring, to be used synchronously',
             function (done){
                 let keyring = new GPGME_Keyring;
                 keyring.getKeys({ prepare_sync: true }).then(function (result){
                     expect(result).to.be.an('array');
                     expect(result[0].get('hasSecret')).to.be.a('boolean');
                     done();
                 });
             }
         );
 
         it('Loading specific Key from Keyring, to be used synchronously',
             function (done){
                 let keyring = new GPGME_Keyring;
                 keyring.getKeys({
                     pattern: kp.validKeyFingerprint,
                     prepare_sync: true }).then(
                     function (result){
                         expect(result).to.be.an('array');
                         expect(result[0].get('hasSecret')).to.be.a('boolean');
                         done();
                     }
                 );
             }
         );
 
         it('Querying non-existing Key from Keyring', function (done){
             let keyring = new GPGME_Keyring;
             keyring.getKeys({
                 pattern: kp.invalidKeyFingerprint,
                 prepare_sync: true
             }).then(function (result){
                 expect(result).to.be.an('array');
                 expect(result.length).to.equal(0);
                 done();
             });
         });
 
     });
 
     describe('GPGME_Message', function (){
 
         it('creating encrypt Message', function (){
             let test0 = createMessage('encrypt');
 
             expect(test0).to.be.an.instanceof(GPGME_Message);
             expect(test0.isComplete()).to.be.false;
         });
 
         it('Message is complete after setting mandatory data', function (){
             let test0 = createMessage('encrypt');
             test0.setParameter('data', mp.valid_encrypt_data);
             test0.setParameter('keys', hp.validFingerprints);
 
             expect(test0.isComplete()).to.be.true;
         });
 
         it('Message is not complete after mandatory data is empty', function (){
             let test0 = createMessage('encrypt');
             test0.setParameter('keys', hp.validFingerprints);
             expect(test0.isComplete()).to.be.false;
             expect(function (){
                 test0.setParameter('data', '');
             }).to.throw(
                 err_list.PARAM_WRONG.msg);
         });
 
         it('Complete Message contains the data that was set', function (){
             let test0 = createMessage('encrypt');
             test0.setParameter('data', mp.valid_encrypt_data);
             test0.setParameter('keys', hp.validFingerprints);
 
             expect(test0.message).to.not.be.null;
             expect(test0.message).to.have.keys('op', 'data', 'keys',
                 'chunksize');
             expect(test0.message.op).to.equal('encrypt');
             expect(test0.message.data).to.equal(
                 mp.valid_encrypt_data);
         });
 
         it ('Not accepting non-allowed operation', function (){
             expect(function () {
                 createMessage(mp.invalid_op_action);
             }).to.throw(
                 err_list.MSG_WRONG_OP.msg);
         });
         it('Not accepting wrong parameter type', function (){
             expect(function () {
                 createMessage(mp.invalid_op_type);
             }).to.throw(
                 err_list.PARAM_WRONG.msg);
         });
 
         it('Not accepting wrong parameter name', function (){
             let test0 = createMessage(mp.invalid_param_test.valid_op);
             for (let i=0;
                 i < mp.invalid_param_test.invalid_param_names.length; i++){
                 expect(function (){
                     test0.setParameter(
                         mp.invalid_param_test.invalid_param_names[i],
                         'Somevalue');}
                 ).to.throw(err_list.PARAM_WRONG.msg);
             }
         });
 
         it('Not accepting wrong parameter value', function (){
             let test0 = createMessage(mp.invalid_param_test.valid_op);
             for (let j=0;
                 j < mp.invalid_param_test.invalid_values_0.length; j++){
                 expect(function (){
                     test0.setParameter(
                         mp.invalid_param_test.validparam_name_0,
                         mp.invalid_param_test.invalid_values_0[j]);
                 }).to.throw(err_list.PARAM_WRONG.msg);
             }
         });
     });
 
 }
 
 export default { unittests };
\ No newline at end of file