require "rails_helper" RSpec.describe ReadNotificationsService do let(:user) { create(:user) } let(:mock) { instance_double(NotificationCounter) } before do allow(NotificationCounter).to receive(:new) { mock } allow(mock).to receive(:set_to_zero).and_return(true) end it "sends to buffer" do expect(described_class.new(user).mark_as_read).to eq("read") end end