Add regression spec for debug_url

there was already a unit test exercising the logic, but no feature
test actually running against a real browser instance.

expecting this spec to fail on the latest version of chrome.

Author: Jell

spec/features/driver_spec.rb

@@ -1605,6 +1605,15 @@ def create_screenshot(file, *args)
 
         expect(@session).to have_content("test_cookie")
       end
+
+      it "has a working debug_url" do
+        session = Capybara::Session.new(:cuprite_with_inspector, TestApp)
+        session.visit "/cuprite/arbitrary_path/200"
+
+        expect do
+          URI.parse(session.driver.debug_url)
+        end.not_to raise_error
+      end
     end
   end
 end

spec/spec_helper.rb

@@ -30,6 +30,10 @@
   Capybara::Cuprite::Driver.new(app, options)
 end
 
+Capybara.register_driver(:cuprite_with_inspector) do |app|
+  Capybara::Cuprite::Driver.new(app, { inspector: true })
+end
+
 module TestSessions
   Cuprite = Capybara::Session.new(:cuprite, TestApp)
 end