Support both request and feature specs in have_gitlab_http_status

spec/support/matchers/have_gitlab_http_status.rb

@@ -8,7 +8,11 @@ RSpec::Matchers.define :have_gitlab_http_status do |expected|
   end
 
   failure_message do |actual|
+    # actual can be either an ActionDispatch::TestResponse (which uses #response_code)
+    # or a Capybara::Session (which uses #status_code)
+    response_code = actual.try(:response_code) || actual.try(:status_code)
+
     "expected the response to have status code #{expected.inspect}" \
-    " but it was #{actual.status_code}. The response was: #{actual.body}"
+    " but it was #{response_code}. The response was: #{actual.body}"
   end
 end