A test case for attributes declared as strings.

test/serializer_test.rb

@@ -62,6 +62,17 @@ def test_attributes_method_with_unsymbolizable_key
     }, hash)
   end
 
+  def test_attributes_method_with_string_args
+    user = User.new
+    user_serializer = UserAttributesDefinedByStringsSerializer.new(user, scope: {})
+
+    hash = user_serializer.as_json
+
+    assert_equal({
+      user_attributes_defined_by_strings: { first_name: "Jose", :last_name => "Valim" }
+    }, hash)
+  end
+
   def test_attribute_method_with_name_as_serializer_prefix
     object = SomeObject.new("something")
     object_serializer = SomeSerializer.new(object, {})

test/test_fakes.rb

@@ -86,6 +86,10 @@ def serializable_hash
   end
 end
 
+class UserAttributesDefinedByStringsSerializer < ActiveModel::Serializer
+  attributes 'first_name', 'last_name'
+end
+
 class DefaultUserSerializer < ActiveModel::Serializer
   attributes :first_name, :last_name
 end