Tests update

app/assets/javascripts/boards/models/list.js.es6

 class List {
   constructor (obj) {
     this.id = obj.id;
-    this._uid = Math.ceil(Math.random() * 1000);
+    this._uid = this.guid();
     this.position = obj.position;
     this.title = obj.title;
     this.type = obj.list_type;
@@ -20,6 +20,13 @@ class List {
     }
   }
 
+  guid() {
+    const s4 = () => {
+      return Math.floor((1 + Math.random()) * 0x10000).toString(16).substring(1);
+    }
+    return `${s4()}${s4()}-${s4()}-${s4()}-${s4()}-${s4()}${s4()}${s4()}`;
+  }
+
   save () {
     return gl.boardService.createList(this.label.id)
       .then((resp) => {

app/assets/javascripts/boards/vue_resource_interceptor.js.es6

-Vue.activeResources = 0;
-
 Vue.http.interceptors.push((request, next)  => {
-  Vue.activeResources++;
+  Vue.activeResources = Vue.activeResources ? Vue.activeResources + 1 : 1;
 
-  next((response) => {
+  setTimeout(() => {
     Vue.activeResources--;
-  });
+  }, 500);
+  next();
 });