Works only with active_model_serializers ~> 0.9.0

Unfortunately, the minor versions of active_model_serializers are not compatible with each other. If you are looking for matchers that work with active_model_serializers ~> 0.8.0, please checkout the original repo https://github.com/tonyta/active_model_serializers_matchers/

For original readme, please refer to https://github.com/tonyta/active_model_serializers_matchers