Show device identity details and resolve hostnames

test/server/device-inventory.test.js

@@ -116,6 +116,43 @@ test('malformed persisted devices and remote observations cannot enter canonical
   ]);
 });
 
+test('device inventory resolves hostnames without making reverse lookup a refresh dependency', async (t) => {
+  const directory = fs.mkdtempSync(path.join(os.tmpdir(), 'harbor-device-hostname-'));
+  t.after(() => fs.rmSync(directory, { recursive: true, force: true }));
+  const store = createJsonStore({ filePath: path.join(directory, 'devices.json'), defaultValue: {} });
+  const observedAt = '2026-08-11T12:00:00.000Z';
+  const mac = '00:11:22:33:44:55';
+  let ip = '192.168.50.10';
+  let lookupFails = false;
+  const lookups = [];
+  const service = createDeviceInventoryService({
+    store,
+    observe: () => ({
+      observedAt,
+      error: null,
+      observations: [{ ip, mac, interface: 'br0', observedAt, active: true }],
+    }),
+    resolveHostname: async (address) => {
+      lookups.push(address);
+      if (lookupFails) throw new Error('reverse DNS unavailable');
+      return 'living-room.local.';
+    },
+    now: () => new Date(observedAt),
+  });
+
+  let snapshot = await service.refresh();
+  assert.equal(snapshot.devices[0].hostname, 'living-room.local');
+  snapshot = await service.refresh();
+  assert.deepEqual(lookups, ['192.168.50.10']);
+
+  ip = '192.168.50.11';
+  lookupFails = true;
+  snapshot = await service.refresh();
+  assert.equal(snapshot.devices[0].ip, ip);
+  assert.equal(snapshot.devices[0].hostname, 'living-room.local');
+  assert.deepEqual(lookups, ['192.168.50.10', '192.168.50.11']);
+});
+
 test('device inventory discovers, merges, persists metadata and expires devices after 30 days', async (t) => {
   const directory = fs.mkdtempSync(path.join(os.tmpdir(), 'harbor-devices-'));
   t.after(() => fs.rmSync(directory, { recursive: true, force: true }));