Add test for conference registration controller edit and update action

spec/controllers/conference_registration_controller_spec.rb

@@ -0,0 +1,76 @@
+require 'spec_helper'
+
+describe ConferenceRegistrationsController, type: :controller do
+  let(:conference) { create(:conference) }
+  let(:user) { create(:user) }
+
+  context 'user is signed in' do
+    before { sign_in(user) }
+
+    describe 'GET #edit' do
+      before do
+        @registration = create(:registration, conference: conference, user: user)
+        get :edit, conference_id: conference.short_title
+      end
+
+      it 'assigns conference and registration variable' do
+        expect(assigns(:conference)).to eq conference
+        expect(assigns(:registration)).to eq @registration
+      end
+
+      it 'renders the edit template' do
+        expect(response).to render_template('edit')
+      end
+    end
+
+    describe 'PATCH #update' do
+      before do
+        @registration = create(:registration,
+                               conference: conference,
+                               user: user,
+                               arrival: Date.new(2014, 04, 25))
+      end
+
+      context 'updates successfully' do
+        before do
+          patch :update, registration: attributes_for(:registration, arrival: Date.new(2014, 04, 29)),
+                         conference_id: conference.short_title
+        end
+
+        it 'redirects to registration show path' do
+          expect(response).to redirect_to conference_conference_registrations_path(conference.short_title)
+        end
+
+        it 'shows success message in flash notice' do
+          expect(flash[:notice]).to match('Registration was successfully updated.')
+        end
+
+        it 'updates the registration' do
+          @registration.reload
+          expect(@registration.arrival).to eq Date.new(2014, 04, 29)
+        end
+      end
+
+      context 'update fails' do
+        before do
+          allow_any_instance_of(Registration).to receive(:update_attributes).and_return(false)
+          patch :update, registration: attributes_for(:registration, arrival: Date.new(2014, 04, 27)),
+                         conference_id: conference.short_title
+        end
+
+        it 'renders edit template' do
+          expect(response).to render_template('edit')
+        end
+
+        it 'shows error in flash message' do
+          expect(flash[:error]).to match "Could not update your registration for The dog and pony show: #{@registration.errors.full_messages.join('. ')}."
+        end
+
+        it 'does not update the registration' do
+          @registration.reload
+          expect(@registration.arrival).to eq Date.new(2014, 04, 25)
+        end
+      end
+    end
+  end
+end