Upgrade to devise 4.2.x

app/controllers/application_controller.rb

@@ -15,6 +15,6 @@ def ensure_domain
   end
 
   def configure_permitted_parameters
-    devise_parameter_sanitizer.for(:sign_up) << :name
+    devise_parameter_sanitizer.permit(:sign_up, keys: [:name])
   end
 end

spec/models/person_spec.rb

@@ -5,12 +5,17 @@
     @it = Person.new
   end
 
-  it { should validate_uniqueness_of :email }
   it { should validate_presence_of :name }
   it { should validate_presence_of :email }
   it { should have_many :projects }
   it { should have_many :user_stories }
 
+  it "should validate_uniqueness_of :email" do
+    p1 = create_person
+    p2 = Person.new(email: p1.email).tap(&:valid?)
+    expect(p2.errors[:email]).to include('has already been taken')
+  end
+
   describe 'admin?' do
     let(:user) { Person.new }
 

spec/rails_helper.rb

@@ -57,7 +57,7 @@
   # https://relishapp.com/rspec/rspec-rails/docs
   Capybara.default_host = "http://app.agileista.local"
   config.infer_spec_type_from_file_location!
-  config.include Devise::TestHelpers, type: :controller
+  config.include Devise::Test::ControllerHelpers, type: :controller
   config.include SpecHelpers::ModelsHelper
   config.include Warden::Test::Helpers
   Warden.test_mode!