How can I assert that no route matches in a Rails integration test?

Question

I have a Rails 3 integration test which tests my routes. It contains tests such as:

assert_routing(
    \"/#{@category.url.path}/#{@foo.url.path}\",
    { :c         


        

Answer 1

I ended up doing this:

  def test_no_routes_match_when_neither_foo_nor_bar_exist
    assert_raises(ActionController::RoutingError) do
      assert_recognizes({}, '/category/this-is-neither-a-foo-nor-a-bar')
    end
  end

Slightly silly, but it gets the job done.

Note that this does not work with Rails 4. See the answer below for a Rails 4 solution.