diff --git a/src/__tests__/App.test.tsx b/src/__tests__/App.test.tsx
new file mode 100644
index 0000000..8cbe6c7
--- /dev/null
+++ b/src/__tests__/App.test.tsx
@@ -0,0 +1,25 @@
+import { render, screen, waitFor } from '@testing-library/react'
+import { describe, it, expect } from 'vitest'
+import App from '@/App'
+
+describe('App', () => {
+  it('renderiza título premium', () => {
+    render(<App />)
+    expect(screen.getByRole('heading', { name: /reserva rede 1001/i })).toBeInTheDocument()
+  })
+
+  it('exibe marcas retornadas do supabase após carregar', async () => {
+    render(<App />)
+    await waitFor(() => {
+      expect(screen.getByText('Hotel 1001 Noites')).toBeInTheDocument()
+      expect(screen.getByText('Dolce Amore')).toBeInTheDocument()
+    })
+  })
+
+  it('não mostra estado de loading após fetch completar', async () => {
+    render(<App />)
+    await waitFor(() => {
+      expect(screen.queryByText(/carregando marcas/i)).not.toBeInTheDocument()
+    })
+  })
+})
diff --git a/src/__tests__/setup.ts b/src/__tests__/setup.ts
new file mode 100644
index 0000000..6ef4a0e
--- /dev/null
+++ b/src/__tests__/setup.ts
@@ -0,0 +1,42 @@
+import '@testing-library/jest-dom/vitest'
+import { cleanup } from '@testing-library/react'
+import { afterEach, vi } from 'vitest'
+
+afterEach(() => {
+  cleanup()
+})
+
+// Mock do Supabase client — imita from('marcas').select('*').eq('ativa', true).order('nome')
+vi.mock('@/lib/supabase', () => {
+  const mockMarcas = [
+    {
+      id: '3fac5ed4-100f-4c0a-82ce-06110758b9c9',
+      nome: 'Hotel 1001 Noites',
+      categorias: ['Standard', 'Superior', 'Luxo'],
+      permanencias: ['3hrs', '6hrs', 'Pernoite'],
+      descricao: null,
+      ativa: true,
+      created_at: '2026-04-13T00:00:00Z',
+      updated_at: '2026-04-13T00:00:00Z',
+    },
+    {
+      id: '11111111-1111-1111-1111-111111111111',
+      nome: 'Dolce Amore',
+      categorias: ['Suite Master', 'Apartamento'],
+      permanencias: ['3hrs', '4hrs'],
+      descricao: null,
+      ativa: true,
+      created_at: '2026-04-13T00:00:00Z',
+      updated_at: '2026-04-13T00:00:00Z',
+    },
+  ]
+
+  const orderFn = vi.fn(() => Promise.resolve({ data: mockMarcas, error: null }))
+  const eqFn = vi.fn(() => ({ order: orderFn }))
+  const selectFn = vi.fn(() => ({ eq: eqFn, order: orderFn }))
+  const fromFn = vi.fn(() => ({ select: selectFn }))
+
+  return {
+    supabase: { from: fromFn },
+  }
+})