diff --git a/marketplace/src/context/AuthContext.test.tsx b/marketplace/src/context/AuthContext.test.tsx
new file mode 100644
index 0000000..5df05ef
--- /dev/null
+++ b/marketplace/src/context/AuthContext.test.tsx
@@ -0,0 +1,125 @@
+import { render, screen, waitFor } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import { AuthProvider, useAuth } from './AuthContext'
+
+const navigateMock = vi.fn()
+const setTokenMock = vi.fn()
+const logoutMock = vi.fn().mockResolvedValue(undefined)
+
+vi.mock('react-router-dom', async () => {
+  const actual = await vi.importActual<typeof import('react-router-dom')>('react-router-dom')
+  return {
+    ...actual,
+    useNavigate: () => navigateMock
+  }
+})
+
+vi.mock('../services/apiClient', () => ({
+  apiClient: {
+    setToken: setTokenMock
+  }
+}))
+
+vi.mock('../services/auth', () => ({
+  authService: {
+    logout: logoutMock
+  }
+}))
+
+function AuthConsumer() {
+  const { user, loading, login, logout, setUser } = useAuth()
+  return (
+    <div>
+      <div data-testid="loading">{loading ? 'loading' : 'ready'}</div>
+      <div data-testid="username">{user?.name ?? 'guest'}</div>
+      <button onClick={() => login('token-123', 'admin', 'Admin User', '1')}>login admin</button>
+      <button onClick={() => login('token-456', 'delivery', 'Delivery User', '2')}>login delivery</button>
+      <button
+        onClick={() =>
+          setUser({
+            token: 'token-999',
+            role: 'seller',
+            name: 'Seller User',
+            id: '3',
+            companyId: 'company-1'
+          })
+        }
+      >
+        set user
+      </button>
+      <button onClick={logout}>logout</button>
+    </div>
+  )
+}
+
+describe('AuthProvider', () => {
+  beforeEach(() => {
+    localStorage.clear()
+    navigateMock.mockReset()
+    setTokenMock.mockReset()
+    logoutMock.mockClear()
+  })
+
+  afterEach(() => {
+    localStorage.clear()
+  })
+
+  it('hydrates user from localStorage and sets token', async () => {
+    const persisted = { token: 'persisted-token', role: 'admin', name: 'Persisted', id: '10' }
+    localStorage.setItem('mp-auth-user', JSON.stringify(persisted))
+
+    render(
+      <AuthProvider>
+        <AuthConsumer />
+      </AuthProvider>
+    )
+
+    expect(screen.getByTestId('username')).toHaveTextContent('Persisted')
+    expect(setTokenMock).toHaveBeenCalledWith('persisted-token')
+    await waitFor(() => expect(screen.getByTestId('loading')).toHaveTextContent('ready'))
+  })
+
+  it('logs in and navigates based on role', async () => {
+    const user = userEvent.setup()
+    render(
+      <AuthProvider>
+        <AuthConsumer />
+      </AuthProvider>
+    )
+
+    await user.click(screen.getByRole('button', { name: /login admin/i }))
+
+    expect(navigateMock).toHaveBeenCalledWith('/dashboard', { replace: true })
+    expect(localStorage.getItem('mp-auth-user')).toContain('Admin User')
+
+    await user.click(screen.getByRole('button', { name: /login delivery/i }))
+    expect(navigateMock).toHaveBeenCalledWith('/entregas', { replace: true })
+  })
+
+  it('clears session on logout', async () => {
+    const user = userEvent.setup()
+    render(
+      <AuthProvider>
+        <AuthConsumer />
+      </AuthProvider>
+    )
+
+    await user.click(screen.getByRole('button', { name: /set user/i }))
+    expect(localStorage.getItem('mp-auth-user')).toContain('Seller User')
+
+    await user.click(screen.getByRole('button', { name: /logout/i }))
+
+    expect(logoutMock).toHaveBeenCalledTimes(1)
+    await waitFor(() => expect(localStorage.getItem('mp-auth-user'))).toBeNull()
+    expect(navigateMock).toHaveBeenCalledWith('/login', { replace: true })
+    expect(setTokenMock).toHaveBeenCalledWith(null)
+  })
+
+  it('throws when useAuth is used outside provider', () => {
+    const ConsoleError = console.error
+    console.error = vi.fn()
+    expect(() => render(<AuthConsumer />)).toThrow('useAuth must be used within AuthProvider')
+    console.error = ConsoleError
+  })
+})
diff --git a/marketplace/src/context/ThemeContext.test.tsx b/marketplace/src/context/ThemeContext.test.tsx
new file mode 100644
index 0000000..7eef17a
--- /dev/null
+++ b/marketplace/src/context/ThemeContext.test.tsx
@@ -0,0 +1,95 @@
+import { render, screen, waitFor } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { ThemeProvider, useTheme } from './ThemeContext'
+
+function ThemeConsumer() {
+  const { theme, resolvedTheme, setTheme, toggleTheme } = useTheme()
+  return (
+    <div>
+      <div data-testid="theme">{theme}</div>
+      <div data-testid="resolved">{resolvedTheme}</div>
+      <button onClick={() => setTheme('dark')}>set dark</button>
+      <button onClick={toggleTheme}>toggle</button>
+    </div>
+  )
+}
+
+describe('ThemeProvider', () => {
+  beforeEach(() => {
+    localStorage.clear()
+  })
+
+  it('loads theme from localStorage and applies resolved theme', () => {
+    localStorage.setItem('mp-theme', 'dark')
+    const matchMediaMock = vi.fn().mockReturnValue({
+      matches: false,
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn()
+    })
+    vi.stubGlobal('matchMedia', matchMediaMock)
+
+    render(
+      <ThemeProvider>
+        <ThemeConsumer />
+      </ThemeProvider>
+    )
+
+    expect(screen.getByTestId('theme')).toHaveTextContent('dark')
+    expect(screen.getByTestId('resolved')).toHaveTextContent('dark')
+    expect(document.documentElement.classList.contains('dark')).toBe(true)
+    expect(document.documentElement.getAttribute('data-theme')).toBe('dark')
+  })
+
+  it('resolves system theme when set to system', async () => {
+    const matchMediaMock = vi.fn().mockReturnValue({
+      matches: true,
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn()
+    })
+    vi.stubGlobal('matchMedia', matchMediaMock)
+
+    render(
+      <ThemeProvider>
+        <ThemeConsumer />
+      </ThemeProvider>
+    )
+
+    expect(screen.getByTestId('theme')).toHaveTextContent('system')
+    expect(screen.getByTestId('resolved')).toHaveTextContent('dark')
+    expect(document.documentElement.classList.contains('dark')).toBe(true)
+
+    const user = userEvent.setup()
+    await user.click(screen.getByRole('button', { name: /set dark/i }))
+    expect(localStorage.getItem('mp-theme')).toBe('dark')
+  })
+
+  it('toggles between light and dark', async () => {
+    const matchMediaMock = vi.fn().mockReturnValue({
+      matches: false,
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn()
+    })
+    vi.stubGlobal('matchMedia', matchMediaMock)
+
+    render(
+      <ThemeProvider>
+        <ThemeConsumer />
+      </ThemeProvider>
+    )
+
+    const user = userEvent.setup()
+    expect(screen.getByTestId('resolved')).toHaveTextContent('light')
+
+    await user.click(screen.getByRole('button', { name: /toggle/i }))
+    await waitFor(() => expect(screen.getByTestId('resolved')).toHaveTextContent('dark'))
+    expect(document.documentElement.classList.contains('dark')).toBe(true)
+  })
+
+  it('throws when useTheme is used outside provider', () => {
+    const ConsoleError = console.error
+    console.error = vi.fn()
+    expect(() => render(<ThemeConsumer />)).toThrow('useTheme must be used within ThemeProvider')
+    console.error = ConsoleError
+  })
+})