diff --git a/frontend_tests/node_tests/drafts.js b/frontend_tests/node_tests/drafts.js
index fc703ce6f0..a249b232e3 100644
--- a/frontend_tests/node_tests/drafts.js
+++ b/frontend_tests/node_tests/drafts.js
@@ -21,13 +21,13 @@ set_global('localStorage', {
     },
 });
 
-function stub_timestamp(model, timestamp, func) {
-    var original_func = model.getTimestamp;
-    model.getTimestamp = function () {
+function stub_timestamp(timestamp, func) {
+    var original_func = Date.prototype.getTime;
+    Date.prototype.getTime = function () {
         return timestamp;
     };
     func();
-    model.getTimestamp = original_func;
+    Date.prototype.getTime = original_func;
 }
 
 var draft_1 = {
@@ -64,10 +64,10 @@ var draft_2 = {
 
     localStorage.clear();
     (function test_addDraft() {
-         stub_timestamp(draft_model, 1, function () {
-             var expected = draft_1;
+         stub_timestamp(1, function () {
+             var expected = _.clone(draft_1);
              expected.updatedAt = 1;
-             var id = draft_model.addDraft(draft_1);
+             var id = draft_model.addDraft(_.clone(draft_1));
 
              assert.deepEqual(ls.get("drafts")[id], expected);
          });
@@ -75,11 +75,11 @@ var draft_2 = {
 
     localStorage.clear();
     (function test_editDraft() {
-         stub_timestamp(draft_model, 2, function () {
+         stub_timestamp(2, function () {
              ls.set("drafts", { id1: draft_1 } );
-             var expected = draft_2;
+             var expected = _.clone(draft_2);
              expected.updatedAt = 2;
-             draft_model.editDraft("id1", draft_2);
+             draft_model.editDraft("id1", _.clone(draft_2));
 
              assert.deepEqual(ls.get("drafts").id1, expected);
          });