Fixed spec @user

spec/helpers/external/mailbluster_helper_spec.rb

@@ -8,7 +8,7 @@ describe  External::MailblusterHelper, type: :helper do
 
   describe 'create_lead' do
     it 'makes a post request to Mailbluster\'s API' do
-      create_lead(@user)
+      create_lead(user)
       expect(WebMock).to have_requested(:post, "api.mailbluster.com/api/leads").
         with { |req| req.body == "abc" }
     end