feat: add test utilities (renderWithProviders, renderHookWithProviders)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/test/utils.tsx

@@ -0,0 +1,66 @@
+import { render, type RenderOptions } from '@testing-library/react'
+import { renderHook } from '@testing-library/react'
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+import { MemoryRouter } from 'react-router-dom'
+import { AuthProvider } from '@/context/AuthContext'
+import type { ReactElement, ReactNode } from 'react'
+
+export function createTestQueryClient() {
+  return new QueryClient({
+    defaultOptions: {
+      queries: {
+        retry: false,
+        gcTime: 0,
+      },
+      mutations: {
+        retry: false,
+      },
+    },
+  })
+}
+
+interface ProvidersProps {
+  children: ReactNode
+  initialRoute?: string
+}
+
+function Providers({ children, initialRoute = '/' }: ProvidersProps) {
+  const queryClient = createTestQueryClient()
+  return (
+    <QueryClientProvider client={queryClient}>
+      <MemoryRouter initialEntries={[initialRoute]}>
+        <AuthProvider>
+          {children}
+        </AuthProvider>
+      </MemoryRouter>
+    </QueryClientProvider>
+  )
+}
+
+export function renderWithProviders(
+  ui: ReactElement,
+  options?: Omit<RenderOptions, 'wrapper'> & { initialRoute?: string },
+) {
+  const { initialRoute, ...renderOptions } = options ?? {}
+  return render(ui, {
+    wrapper: ({ children }) => (
+      <Providers initialRoute={initialRoute}>{children}</Providers>
+    ),
+    ...renderOptions,
+  })
+}
+
+export function renderHookWithProviders<TResult>(
+  hook: () => TResult,
+  options?: { initialRoute?: string },
+) {
+  const queryClient = createTestQueryClient()
+  const wrapper = ({ children }: { children: ReactNode }) => (
+    <QueryClientProvider client={queryClient}>
+      <MemoryRouter initialEntries={[options?.initialRoute ?? '/']}>
+        {children}
+      </MemoryRouter>
+    </QueryClientProvider>
+  )
+  return { ...renderHook(hook, { wrapper }), queryClient }
+}