js: make init export immutable

--

* src/index.js: The export now uses a freezed Object, which does not
  allow for simply overwriting the init method by e.g. a third-party
  library.
* BrowsertestExtension: Added some tests trying if decryption of bad
  data properly fails

1 files changed, 3 insertions, 4 deletions

diff --git a/lang/js/src/index.js b/lang/js/src/index.js
index 2fed95f9..51f07538 100644
--- a/lang/js/src/index.js
+++ b/lang/js/src/index.js
@@ -34,7 +34,7 @@ import { Connection } from './Connection';
  */
 function init(){
     return new Promise(function(resolve, reject){
-        let connection = Object.freeze(new Connection);
+        const connection = Object.freeze(new Connection);
         connection.checkConnection(false).then(
             function(result){
                 if (result === true) {
@@ -48,6 +48,5 @@ function init(){
     });
 }
 
-export default {
-    init: init
-};
\ No newline at end of file
+const exportvalue = Object.freeze({init:init});
+export default exportvalue;
\ No newline at end of file