feat(ntfy): dispatch gateway_online/gateway_offline from model

test/models/gateway_test.rb

@@ -0,0 +1,51 @@
+require "test_helper"
+
+class GatewayTest < ActiveSupport::TestCase
+  include ActiveJob::TestHelper
+
+  setup do
+    ActiveJob::Base.queue_adapter = :test
+    @admin = AdminUser.create!(
+      name: "GW Admin", email: "gw@example.com",
+      password: "password123",
+      ntfy_topic: "gw-topic", ntfy_token: "tk_gw",
+      ntfy_enabled: true, ntfy_server_url: "https://ntfy.example.com"
+    )
+    stub_request(:post, "https://ntfy.example.com/gw-topic").to_return(status: 200)
+  end
+
+  test "heartbeat! dispatches gateway_online notification when transitioning from offline" do
+    gateway = Gateway.create!(
+      device_id: "dev-online", name: "GW",
+      api_key_digest: "x" * 64, status: "offline"
+    )
+
+    assert_enqueued_jobs 1 do
+      gateway.heartbeat!
+    end
+  end
+
+  test "heartbeat! does not dispatch if already online" do
+    gateway = Gateway.create!(
+      device_id: "dev-stay", name: "GW",
+      api_key_digest: "y" * 64, status: "online",
+      last_heartbeat_at: 1.minute.ago
+    )
+
+    assert_enqueued_jobs 0 do
+      gateway.heartbeat!
+    end
+  end
+
+  test "mark_offline! dispatches gateway_offline notification when transitioning from online" do
+    gateway = Gateway.create!(
+      device_id: "dev-off", name: "GW",
+      api_key_digest: "z" * 64, status: "online",
+      last_heartbeat_at: 1.minute.ago
+    )
+
+    assert_enqueued_jobs 1 do
+      gateway.mark_offline!
+    end
+  end
+end