How can I test ActiveRecord::RecordNotFound in my rails app?

Question

I have this code in my controller and want to test this code line with a functional test.

raise ActiveRecord::RecordNotFound if @post.nil?

which assert method should I use? I use the built-in rails 2.3.5 test framework.

I tried it with this code:

 test "should return 404 if page doesn't exist." do get :show, :url => ["nothing", "here"] assert_response :missing end

but it doesn't work for me. Got this test output:

test_should_return_404_if_page_doesn't_exist.(PageControllerTest): ActiveRecord::RecordNotFound: ActiveRecord::RecordNotFound app/controllers/page_controller.rb:7:in `show' /test/functional/page_controller_test.rb:21:in `test_should_return_404_if_page_doesn't_exist.'

Daniel · Accepted Answer · 2017-06-07 09:53:20Z

There are two things you can do. The first is to let ActionController provide the default action when it rescues ActiveRecord::RecordNotFound:

class PostsControllerTest < ActionController::TestCase test "raises RecordNotFound when not found" do assert_raises(ActiveRecord::RecordNotFound) do get :show, :id => 1234 end end end

Using this method, you can't assert what gets rendered. You have to trust Rails/ActionController not to change behaviour.

An alternative, which I've sometimes used, is this:

class PostsControllerTest < ActionController::TestCase test "renders post_missing page, and returns 404" do get :show, params: { :id => 1234 } assert_response :not_found assert_template "post_missing" end end class PostsController < ApplicationController def show @post = current_user.posts.find_by!(slug: params[:slug]) end rescue_from ActiveRecord::RecordNotFound do render :action => "post_missing", :status => :not_found end end

You should read more about #rescue_from on the ActiveSupport API.

For simplicity, I usually go with my 1st solution though.

I like to rescue_from ActiveRecord::RecordNotFound in my ApplicationController (in application_controller.rb), because I don't like the assert_raises blocks.

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