Add admin notifications for new Mastodon versions (#26582)

spec/workers/scheduler/software_update_check_scheduler_spec.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe Scheduler::SoftwareUpdateCheckScheduler do
+  subject { described_class.new }
+
+  describe 'perform' do
+    let(:service_double) { instance_double(SoftwareUpdateCheckService, call: nil) }
+
+    before do
+      allow(SoftwareUpdateCheckService).to receive(:new).and_return(service_double)
+    end
+
+    it 'calls SoftwareUpdateCheckService' do
+      subject.perform
+      expect(service_double).to have_received(:call)
+    end
+  end
+end