Fix health service tests

webui/src/__tests__/App.test.tsx

@@ -12,12 +12,14 @@ import { AuthProvider } from '@/contexts/AuthContext'
 vi.mock('@/lib/api', () => ({
   instancesApi: {
     list: vi.fn(),
+    get: vi.fn(),
     create: vi.fn(),
     update: vi.fn(),
     start: vi.fn(),
     stop: vi.fn(),
     restart: vi.fn(),
     delete: vi.fn(),
+    getHealth: vi.fn(),
   },
   serverApi: {
     getHelp: vi.fn(),
@@ -30,9 +32,21 @@ vi.mock('@/lib/api', () => ({
 vi.mock('@/lib/healthService', () => ({
   healthService: {
     subscribe: vi.fn(() => () => {}),
-    checkHealth: vi.fn(),
+    refreshHealth: vi.fn(() => Promise.resolve()),
+    checkHealthAfterOperation: vi.fn(),
+    performHealthCheck: vi.fn(() => Promise.resolve({
+      state: 'ready',
+      instanceStatus: 'running',
+      lastChecked: new Date(),
+      source: 'http'
+    })),
   },
-  checkHealth: vi.fn(),
+  checkHealth: vi.fn(() => Promise.resolve({
+    state: 'ready',
+    instanceStatus: 'running',
+    lastChecked: new Date(),
+    source: 'http'
+  })),
 }))
 
 function renderApp() {