Fixed issue with failing tests

app/assets/javascripts/subscription.js.coffee

@@ -2,7 +2,7 @@ class @Subscription
   constructor: (container) ->
     $container = $(container)
     @url = $container.attr('data-url')
-    @subscribe_button = $container.find('.issuable-subscribe-button')
+    @subscribe_button = $container.find('.js-subscribe-button')
     @subscription_status = $container.find('.subscription-status')
     @subscribe_button.unbind('click').click(@toggleSubscription)
 

app/views/projects/labels/_label.html.haml

@@ -14,7 +14,7 @@
       .label-subscription{data: {url: toggle_subscription_namespace_project_label_path(@project.namespace, @project, label)}}
         .subscription-status{data: {status: label_subscription_status(label)}}
 
-        %a.label-subscribe-button.btn.action-buttons{data: {toggle: "tooltip"}}
+        %button.js-subscribe-button.label-subscribe-button.btn.action-buttons{ type: 'button', data: {toggle: "tooltip"} }
           %span= label_subscription_toggle_button_text(label)
 
     - if can? current_user, :admin_label, @project

app/views/shared/issuable/_sidebar.html.haml

@@ -128,7 +128,7 @@
           .title.hide-collapsed
             Notifications
           - subscribtion_status = subscribed ? 'subscribed' : 'unsubscribed'
-          %button.btn.btn-block.btn-gray.issuable-subscribe-button.hide-collapsed{:type => 'button'}
+          %button.btn.btn-block.btn-gray.js-subscribe-button.issuable-subscribe-button.hide-collapsed{:type => 'button'}
             %span= subscribed ? 'Unsubscribe' : 'Subscribe'
           .subscription-status.hide-collapsed{data: {status: subscribtion_status}}
             .unsubscribed{class: ( 'hidden' if subscribed )}