Add a failing test

Author: iosadchiy

test/integration/requests/request_test.rb

@@ -93,6 +93,14 @@ def test_get_camelized_route_and_links
     JSONAPI.configuration = original_config
   end
 
+  def test_get_accepting_multiple_content_types
+    get '/posts', headers:
+      {
+        'Accept': "application/json, #{JSONAPI::MEDIA_TYPE}, */*"
+      }
+    assert_equal 200, status
+  end
+
   def test_put_single_without_content_type
     put '/posts/3', params:
       {