Add controller spec for Profiles::NotificationsController

spec/controllers/profiles/notifications_controller_spec.rb

+require 'spec_helper'
+
+describe Profiles::NotificationsController do
+  describe 'GET show' do
+    it 'renders' do
+      user = create_user
+      sign_in(user)
+
+      get :show
+      expect(response).to render_template :show
+    end
+  end
+
+  describe 'POST update' do
+    it 'updates only permitted attributes' do
+      user = create_user
+      sign_in(user)
+
+      put :update, user: { notification_email: 'new@example.com', admin: true }
+
+      user.reload
+      expect(user.notification_email).to eq('new@example.com')
+      expect(user.admin).to eq(false)
+      expect(controller).to set_flash[:notice].to('Notification settings saved')
+    end
+
+    it 'shows an error message if the params are invalid' do
+      user = create_user
+      sign_in(user)
+
+      put :update, user: { notification_email: '' }
+
+      expect(user.reload.notification_email).to eq('original@example.com')
+      expect(controller).to set_flash[:alert].to('Failed to save new settings')
+    end
+  end
+
+  def create_user
+    create(:user) do |user|
+      user.emails.create(email: 'original@example.com')
+      user.emails.create(email: 'new@example.com')
+      user.update(notification_email: 'original@example.com')
+      user.save!
+    end
+  end
+end