feat(ntfy): dispatch gateway_offline from CheckGatewayHealthJob after bulk update

test/jobs/check_gateway_health_job_test.rb

@@ -0,0 +1,45 @@
+require "test_helper"
+
+class CheckGatewayHealthJobTest < ActiveJob::TestCase
+  setup do
+    ActiveJob::Base.queue_adapter = :test
+    @admin = AdminUser.create!(
+      name: "Health Admin", email: "health@example.com",
+      password: "password123",
+      ntfy_topic: "health-topic", ntfy_token: "tk_health",
+      ntfy_enabled: true, ntfy_server_url: "https://ntfy.example.com"
+    )
+    stub_request(:post, "https://ntfy.example.com/health-topic").to_return(status: 200)
+  end
+
+  test "dispatches gateway_offline for each stale gateway marked offline" do
+    stale_gw = Gateway.create!(
+      device_id: "stale-1", name: "Stale One",
+      api_key_digest: "a" * 64, status: "online",
+      last_heartbeat_at: 5.minutes.ago
+    )
+    Gateway.create!(
+      device_id: "fresh-1", name: "Fresh",
+      api_key_digest: "b" * 64, status: "online",
+      last_heartbeat_at: 30.seconds.ago
+    )
+
+    assert_enqueued_jobs 1 do
+      CheckGatewayHealthJob.perform_now
+    end
+
+    assert_equal "offline", stale_gw.reload.status
+  end
+
+  test "does not dispatch when no gateways go stale" do
+    Gateway.create!(
+      device_id: "fresh-2", name: "Fresh Two",
+      api_key_digest: "c" * 64, status: "online",
+      last_heartbeat_at: 10.seconds.ago
+    )
+
+    assert_enqueued_jobs 0 do
+      CheckGatewayHealthJob.perform_now
+    end
+  end
+end