require 'rails_helper' describe BlocksJsonSerialization do DummyModel = Class.new do include BlocksJsonSerialization end it 'blocks as_json' do expect { DummyModel.new.as_json } .to raise_error(described_class::JsonSerializationError, /DummyModel/) end it 'blocks to_json' do expect { DummyModel.new.to_json } .to raise_error(described_class::JsonSerializationError, /DummyModel/) end end