gist: 136165


  
      books_controller.rb
    
    
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              class BooksController < ApplicationController
  rescue_from ActiveRecord::RecordNotFound, :with => :book_not_found
  
  def show
    @book = Book.find(params[:id])
  end
 
  def book_not_found
    render :text => "That book is not found"
  end
end
 
            
      books_controller_test.rb
    
    
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              require 'test_helper'
 
class BooksControllerTest < ActionController::TestCase
  test "should catch the error" do
    assert_nothing_raised do
      get :show, :id => 123
    end
  end
end