Testing error pages in Rails with Rspec + Capybara

Question

In Rails 3.2.9 I have custom error pages defines like this:

# application.rb
config.exceptions_app = self.routes

# routes.rb
match \'/404\' => \'errors#n         


        

Answer 1

With Rails 5.2, Capybara 3 I was able to simulate page errors with the following

around do |example|
  Rails.application.config.action_dispatch.show_exceptions = true
  example.run
  Rails.application.config.action_dispatch.show_exceptions = false
end

before do
  allow(Person).to receive(:search).and_raise 'App error simulation!'
end

it 'displays an error message' do
  visit root_path
  fill_in 'q', with: 'anything'
  click_on 'Search'
  expect(page).to have_content 'We are sorry, but the application encountered a problem.'
end

Update

This seems to not always work when running the full test suite. So I had to set config.action_dispatch.show_exceptions = true in config/environments/test.rb and remove the around block.