Restrict serializable_hash to accepted options, only for tests

test/test_helper.rb

@@ -15,6 +15,22 @@ require 'action_controller'
 require 'action_controller/test_case'
 require 'action_controller/railtie'
 require 'active_model_serializers'
+# For now, we only restrict the options to serializable_hash/as_json/to_json
+# in tests, to ensure developers don't add any unsupported options.
+# There's no known benefit, at this time, to having the filtering run in
+# production when the excluded options would simply not be used.
+#
+# However, for documentation purposes, the constant
+# ActiveModel::Serializer::SERIALIZABLE_HASH_VALID_KEYS is defined
+# in the Serializer.
+ActiveModelSerializers::Adapter::Base.class_eval do
+  alias_method :original_serialization_options, :serialization_options
+
+  def serialization_options(options)
+    original_serialization_options(options)
+      .slice(*ActiveModel::Serializer::SERIALIZABLE_HASH_VALID_KEYS)
+  end
+end
 require 'fileutils'
 FileUtils.mkdir_p(File.expand_path('../../tmp/cache', __FILE__))