Add tests for DocumentStorage

src/jio.storage/documentstorage.js

 /*jslint nomen: true*/
-/*global console, Blob, atob, btoa*/
+/*global Blob, atob, btoa*/
 (function (jIO, Blob, atob, btoa) {
   "use strict";
 
@@ -35,7 +35,7 @@
       "_attachment": getSubAttachmentIdFromParam(param)
     })
       .push(function (blob) {
-        return jIO.util.readBlobAsText(blob);
+        return jIO.util.readBlobAsText(blob.data);
       })
       .push(function (text) {
         return JSON.parse(text.target.result);
@@ -54,9 +54,16 @@
           if (document._attachments.hasOwnProperty(key)) {
             if (ATTACHMENT_REGEXP.test(key)) {
               exec = ATTACHMENT_REGEXP.exec(key);
+              try {
                 if (atob(exec[1]) === param._id) {
                   attachments[atob(exec[2])] = {};
                 }
+              } catch (error) {
+                // Check if unable to decode base64 data
+                if (!error instanceof ReferenceError) {
+                  throw error;
+                }
+              }
             }
           }
         }
@@ -67,17 +74,6 @@
       });
   };
 
-  DocumentStorage.prototype.post = function (param) {
-    var doc_id = param._id;
-
-    if (doc_id === undefined) {
-      doc_id = jIO.util.generateUuid();
-    }
-
-    param._id = doc_id;
-    return this.put(param);
-  };
-
   DocumentStorage.prototype.put = function (param) {
     var doc_id = param._id;
 
@@ -116,10 +112,17 @@
         for (key in document._attachments) {
           if (document._attachments.hasOwnProperty(key)) {
             if (DOCUMENT_REGEXP.test(key)) {
+              try {
                 result.push({
                   id: atob(DOCUMENT_REGEXP.exec(key)[1]),
                   value: {}
                 });
+              } catch (error) {
+                // Check if unable to decode base64 data
+                if (!error instanceof ReferenceError) {
+                  throw error;
+                }
+              }
             }
           }
         }