Test handling of exceptions in integration tests

exceptions_test.rb

require 'action_controller/railtie'
require 'minitest/autorun'

class TestApplication < Rails::Application
  config.eager_load = false
  config.root = File.dirname(__FILE__)
  config.session_store :cookie_store, key: 'cookie_store_key'
  config.secret_token    = 'secret_token'
  config.secret_key_base = 'secret_key_base'
end

Rails.logger = Logger.new(StringIO.new)

TestApplication.initialize!

TestApplication.routes.draw do
  root to: 'pages#index'
end

class ApplicationController < ActionController::Base
  protect_from_forgery
end

class PagesController < ApplicationController
  def index
    raise ActionController::BadRequest
  end
end

class ExceptionsTest < ActionDispatch::IntegrationTest
  def test_application_handles_exceptions
    get '/'
    assert_response :bad_request
  end

  def test_exceptions_bubble_up
    assert_raises(ActionController::BadRequest){ get '/' }
  end
end