Display roles in registration list

app/views/admin/registrations/index.html.haml

@@ -28,6 +28,10 @@
               = registration.id
             %td
               = registration.name
+              - @conference.roles.each do |role|
+                - role.users.each do |user|
+                  - if user == registration.user
+                    %span.label.label-info= role.name.titleize
             %td
               = registration.email
             %td

spec/views/admin/registrations/index.html.haml_spec.rb

@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+describe 'admin/registrations/index' do
+  let(:conference) { create(:conference, roles: [role1, role2]) }
+  let(:user) { create(:user) }
+  let(:role1) { create(:organizer_role, users: [user]) }
+  let(:role2) { create(:cfp_role, users: [user]) }
+
+  before :each do
+    assign :conference, conference
+    assign :registrations, [create(:registration, user: user, conference: conference)]
+
+    render
+  end
+
+  it 'renders index' do
+    expect(rendered).to have_selector('table tbody td', text: user.name)
+    expect(rendered).to have_selector('table tbody td span:nth-of-type(1)', text: role1.name.titleize)
+    expect(rendered).to have_selector('table tbody td span:nth-of-type(2)', text: role2.name.titleize)
+  end
+end