Add unit tests for settings components and session hooks

- Implement comprehensive tests for `ProfileSettingsForm`, `PasswordChangeForm`, and `SessionCard` components to validate rendering, interactions, and state handling.
- Add tests for session management hooks (`useSession`, `useRevokeSession`, and `useRevokeAllOtherSessions`) to verify logic and API integration.
- Ensure coverage of edge cases, error handling, and success callbacks across all new tests.

frontend/tests/components/settings/PasswordChangeForm.test.tsx

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+/**
+ * Tests for PasswordChangeForm Component
+ */
+
+import { render, screen, waitFor } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { PasswordChangeForm } from '@/components/settings/PasswordChangeForm';
+import * as useAuthModule from '@/lib/api/hooks/useAuth';
+import { toast } from 'sonner';
+
+jest.mock('@/lib/api/hooks/useAuth');
+jest.mock('sonner', () => ({ toast: { success: jest.fn(), error: jest.fn() } }));
+
+const mockUsePasswordChange = useAuthModule.usePasswordChange as jest.Mock;
+const mockToast = toast as jest.Mocked<typeof toast>;
+
+describe('PasswordChangeForm', () => {
+  let queryClient: QueryClient;
+  let user: ReturnType<typeof userEvent.setup>;
+  const mockMutateAsync = jest.fn();
+
+  beforeEach(() => {
+    queryClient = new QueryClient({
+      defaultOptions: { queries: { retry: false }, mutations: { retry: false } },
+    });
+    user = userEvent.setup();
+    jest.clearAllMocks();
+    mockUsePasswordChange.mockReturnValue({
+      mutateAsync: mockMutateAsync,
+      isPending: false,
+      isError: false,
+      isSuccess: false,
+      error: null,
+    });
+  });
+
+  const renderWithProvider = (component: React.ReactElement) =>
+    render(<QueryClientProvider client={queryClient}>{component}</QueryClientProvider>);
+
+  describe('Rendering', () => {
+    it('renders all password fields', () => {
+      renderWithProvider(<PasswordChangeForm />);
+      expect(screen.getByLabelText(/current password/i)).toBeInTheDocument();
+      expect(screen.getByLabelText(/^new password/i)).toBeInTheDocument();
+      expect(screen.getByLabelText(/confirm new password/i)).toBeInTheDocument();
+    });
+
+    it('renders change password button', () => {
+      renderWithProvider(<PasswordChangeForm />);
+      expect(screen.getByRole('button', { name: /change password/i })).toBeInTheDocument();
+    });
+
+    it('shows password strength requirements', () => {
+      renderWithProvider(<PasswordChangeForm />);
+      expect(screen.getByText(/at least 8 characters/i)).toBeInTheDocument();
+    });
+
+    it('uses usePasswordChange hook', () => {
+      renderWithProvider(<PasswordChangeForm />);
+      expect(mockUsePasswordChange).toHaveBeenCalled();
+    });
+  });
+
+  describe('Form State', () => {
+    it('disables submit when pristine', () => {
+      renderWithProvider(<PasswordChangeForm />);
+      expect(screen.getByRole('button', { name: /change password/i })).toBeDisabled();
+    });
+
+    it('disables inputs while submitting', () => {
+      mockUsePasswordChange.mockReturnValue({
+        mutateAsync: mockMutateAsync,
+        isPending: true,
+        isError: false,
+        isSuccess: false,
+        error: null,
+      });
+
+      renderWithProvider(<PasswordChangeForm />);
+
+      expect(screen.getByLabelText(/current password/i)).toBeDisabled();
+      expect(screen.getByLabelText(/^new password/i)).toBeDisabled();
+      expect(screen.getByLabelText(/confirm new password/i)).toBeDisabled();
+    });
+
+    it('shows loading text while submitting', () => {
+      mockUsePasswordChange.mockReturnValue({
+        mutateAsync: mockMutateAsync,
+        isPending: true,
+        isError: false,
+        isSuccess: false,
+        error: null,
+      });
+
+      renderWithProvider(<PasswordChangeForm />);
+
+      expect(screen.getByText(/changing password/i)).toBeInTheDocument();
+    });
+
+    it('shows cancel button when form is dirty', async () => {
+      renderWithProvider(<PasswordChangeForm />);
+
+      const currentPasswordInput = screen.getByLabelText(/current password/i);
+      await user.type(currentPasswordInput, 'password');
+
+      await waitFor(() => {
+        expect(screen.getByRole('button', { name: /cancel/i })).toBeInTheDocument();
+      });
+    });
+  });
+
+  describe('User Interactions', () => {
+    it('allows typing in current password field', async () => {
+      renderWithProvider(<PasswordChangeForm />);
+
+      const currentPasswordInput = screen.getByLabelText(/current password/i) as HTMLInputElement;
+      await user.type(currentPasswordInput, 'OldPassword123!');
+
+      expect(currentPasswordInput.value).toBe('OldPassword123!');
+    });
+
+    it('allows typing in new password field', async () => {
+      renderWithProvider(<PasswordChangeForm />);
+
+      const newPasswordInput = screen.getByLabelText(/^new password/i) as HTMLInputElement;
+      await user.type(newPasswordInput, 'NewPassword123!');
+
+      expect(newPasswordInput.value).toBe('NewPassword123!');
+    });
+
+    it('allows typing in confirm password field', async () => {
+      renderWithProvider(<PasswordChangeForm />);
+
+      const confirmPasswordInput = screen.getByLabelText(/confirm new password/i) as HTMLInputElement;
+      await user.type(confirmPasswordInput, 'NewPassword123!');
+
+      expect(confirmPasswordInput.value).toBe('NewPassword123!');
+    });
+
+    it('resets form when cancel button is clicked', async () => {
+      renderWithProvider(<PasswordChangeForm />);
+
+      const currentPasswordInput = screen.getByLabelText(/current password/i) as HTMLInputElement;
+      await user.type(currentPasswordInput, 'password');
+
+      await waitFor(() => {
+        expect(screen.getByRole('button', { name: /cancel/i })).toBeInTheDocument();
+      });
+
+      const cancelButton = screen.getByRole('button', { name: /cancel/i });
+      await user.click(cancelButton);
+
+      await waitFor(() => {
+        expect(currentPasswordInput.value).toBe('');
+      });
+    });
+  });
+
+  describe('Form Submission - Success', () => {
+    it('calls mutateAsync with correct data on successful submission', async () => {
+      mockMutateAsync.mockResolvedValueOnce({});
+
+      renderWithProvider(<PasswordChangeForm />);
+
+      // Simulate the hook callback being triggered (success path)
+      const hookCallback = mockUsePasswordChange.mock.calls[0][0];
+
+      // Trigger the callback as if mutation succeeded
+      hookCallback('Password changed successfully');
+
+      expect(mockToast.success).toHaveBeenCalledWith('Password changed successfully');
+    });
+
+    it('calls onSuccess callback after successful password change', async () => {
+      const onSuccess = jest.fn();
+      mockMutateAsync.mockResolvedValueOnce({});
+
+      renderWithProvider(<PasswordChangeForm onSuccess={onSuccess} />);
+
+      // Simulate successful password change through hook callback
+      const hookCallback = mockUsePasswordChange.mock.calls[0][0];
+      hookCallback('Password changed successfully');
+
+      expect(onSuccess).toHaveBeenCalled();
+    });
+
+    it('shows success toast with custom message', async () => {
+      renderWithProvider(<PasswordChangeForm />);
+
+      const hookCallback = mockUsePasswordChange.mock.calls[0][0];
+      hookCallback('Your password has been updated');
+
+      expect(mockToast.success).toHaveBeenCalledWith('Your password has been updated');
+    });
+  });
+
+  describe('Form Validation', () => {
+    it('validates password match', async () => {
+      renderWithProvider(<PasswordChangeForm />);
+
+      await user.type(screen.getByLabelText(/current password/i), 'OldPass123!');
+      await user.type(screen.getByLabelText(/^new password/i), 'NewPass123!');
+      await user.type(screen.getByLabelText(/confirm new password/i), 'DifferentPass123!');
+
+      // Try to submit the form
+      const form = screen.getByRole('button', { name: /change password/i }).closest('form');
+      if (form) {
+        const submitEvent = new Event('submit', { bubbles: true, cancelable: true });
+        form.dispatchEvent(submitEvent);
+
+        await waitFor(() => {
+          expect(screen.getByText(/passwords do not match/i)).toBeInTheDocument();
+        });
+      }
+    });
+
+    it('validates password strength requirements', async () => {
+      renderWithProvider(<PasswordChangeForm />);
+
+      await user.type(screen.getByLabelText(/current password/i), 'OldPass123!');
+      await user.type(screen.getByLabelText(/^new password/i), 'weak');
+      await user.type(screen.getByLabelText(/confirm new password/i), 'weak');
+
+      const form = screen.getByRole('button', { name: /change password/i }).closest('form');
+      if (form) {
+        const submitEvent = new Event('submit', { bubbles: true, cancelable: true });
+        form.dispatchEvent(submitEvent);
+
+        await waitFor(() => {
+          expect(screen.getByText(/password must be at least 8 characters/i)).toBeInTheDocument();
+        });
+      }
+    });
+
+    it('requires all fields to be filled', async () => {
+      renderWithProvider(<PasswordChangeForm />);
+
+      // Leave fields empty and try to submit
+      const form = screen.getByRole('button', { name: /change password/i }).closest('form');
+      if (form) {
+        const submitEvent = new Event('submit', { bubbles: true, cancelable: true });
+        form.dispatchEvent(submitEvent);
+
+        await waitFor(() => {
+          expect(screen.getByText(/current password is required/i)).toBeInTheDocument();
+        });
+      }
+    });
+  });
+});

frontend/tests/components/settings/ProfileSettingsForm.test.tsx

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+/**
+ * Tests for ProfileSettingsForm Component
+ * Tests profile editing functionality
+ */
+
+import { render, screen, waitFor } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { ProfileSettingsForm } from '@/components/settings/ProfileSettingsForm';
+import * as useAuthModule from '@/lib/api/hooks/useAuth';
+import * as useUserModule from '@/lib/api/hooks/useUser';
+import { toast } from 'sonner';
+
+// Mock dependencies
+jest.mock('@/lib/api/hooks/useAuth');
+jest.mock('@/lib/api/hooks/useUser');
+jest.mock('sonner', () => ({
+  toast: {
+    success: jest.fn(),
+    error: jest.fn(),
+  },
+}));
+
+const mockUseCurrentUser = useAuthModule.useCurrentUser as jest.Mock;
+const mockUseUpdateProfile = useUserModule.useUpdateProfile as jest.Mock;
+const mockToast = toast as jest.Mocked<typeof toast>;
+
+describe('ProfileSettingsForm', () => {
+  let queryClient: QueryClient;
+  let user: ReturnType<typeof userEvent.setup>;
+  const mockMutateAsync = jest.fn();
+
+  const mockUser = {
+    id: '1',
+    email: 'test@example.com',
+    first_name: 'John',
+    last_name: 'Doe',
+    is_active: true,
+    is_superuser: false,
+    created_at: '2024-01-01T00:00:00Z',
+  };
+
+  beforeEach(() => {
+    queryClient = new QueryClient({
+      defaultOptions: {
+        queries: { retry: false },
+        mutations: { retry: false },
+      },
+    });
+
+    user = userEvent.setup();
+    jest.clearAllMocks();
+
+    // Mock useCurrentUser to return user
+    mockUseCurrentUser.mockReturnValue(mockUser);
+
+    // Mock useUpdateProfile
+    mockUseUpdateProfile.mockReturnValue({
+      mutateAsync: mockMutateAsync,
+      isPending: false,
+      isError: false,
+      isSuccess: false,
+      error: null,
+    });
+  });
+
+  const renderWithProvider = (component: React.ReactElement) => {
+    return render(
+      <QueryClientProvider client={queryClient}>
+        {component}
+      </QueryClientProvider>
+    );
+  };
+
+  describe('Rendering', () => {
+    it('renders form with all fields', () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      expect(screen.getByText('Profile Information')).toBeInTheDocument();
+      expect(screen.getByLabelText(/first name/i)).toBeInTheDocument();
+      expect(screen.getByLabelText(/last name/i)).toBeInTheDocument();
+      expect(screen.getByLabelText(/email/i)).toBeInTheDocument();
+      expect(screen.getByRole('button', { name: /save changes/i })).toBeInTheDocument();
+    });
+
+    it('populates form with current user data', async () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      await waitFor(() => {
+        const firstNameInput = screen.getByLabelText(/first name/i) as HTMLInputElement;
+        const lastNameInput = screen.getByLabelText(/last name/i) as HTMLInputElement;
+        const emailInput = screen.getByLabelText(/email/i) as HTMLInputElement;
+
+        expect(firstNameInput.value).toBe('John');
+        expect(lastNameInput.value).toBe('Doe');
+        expect(emailInput.value).toBe('test@example.com');
+      });
+    });
+
+    it('disables email field', () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      const emailInput = screen.getByLabelText(/email/i);
+      expect(emailInput).toBeDisabled();
+    });
+
+    it('shows email cannot be changed message', () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      expect(screen.getByText(/cannot be changed from this form/i)).toBeInTheDocument();
+    });
+
+    it('marks first name as required', () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      const firstNameLabel = screen.getByText(/first name/i);
+      expect(firstNameLabel.parentElement?.textContent).toContain('*');
+    });
+  });
+
+  describe('User Interactions', () => {
+    it('allows typing in first name field', async () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      await waitFor(() => {
+        expect((screen.getByLabelText(/first name/i) as HTMLInputElement).value).toBe('John');
+      });
+
+      const firstNameInput = screen.getByLabelText(/first name/i);
+      await user.clear(firstNameInput);
+      await user.type(firstNameInput, 'Jane');
+
+      expect((firstNameInput as HTMLInputElement).value).toBe('Jane');
+    });
+
+    it('allows typing in last name field', async () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      await waitFor(() => {
+        expect((screen.getByLabelText(/last name/i) as HTMLInputElement).value).toBe('Doe');
+      });
+
+      const lastNameInput = screen.getByLabelText(/last name/i);
+      await user.clear(lastNameInput);
+      await user.type(lastNameInput, 'Smith');
+
+      expect((lastNameInput as HTMLInputElement).value).toBe('Smith');
+    });
+  });
+
+  describe('Form Submission', () => {
+    it('uses useUpdateProfile hook correctly', async () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      // Verify the hook is called
+      expect(mockUseUpdateProfile).toHaveBeenCalled();
+
+      // Verify the hook callback would call success handler
+      const hookCallback = mockUseUpdateProfile.mock.calls[0][0];
+      expect(typeof hookCallback).toBe('function');
+    });
+
+    it('calls success toast through hook callback', async () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      // Get the hook callback
+      const hookCallback = mockUseUpdateProfile.mock.calls[0][0];
+      if (hookCallback) {
+        hookCallback('Profile updated successfully');
+        expect(mockToast.success).toHaveBeenCalledWith('Profile updated successfully');
+      }
+    });
+
+    it('calls onSuccess callback when provided', async () => {
+      const onSuccess = jest.fn();
+      renderWithProvider(<ProfileSettingsForm onSuccess={onSuccess} />);
+
+      // Verify onSuccess is passed to the component
+      expect(onSuccess).not.toHaveBeenCalled(); // Not called on mount
+
+      // The onSuccess would be called through the useUpdateProfile hook callback
+      const hookCallback = mockUseUpdateProfile.mock.calls[0][0];
+      if (hookCallback) {
+        hookCallback('Profile updated successfully');
+        expect(onSuccess).toHaveBeenCalled();
+      }
+    });
+  });
+
+  describe('Validation', () => {
+    it('marks first name field as required in UI', () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      // First name label should have asterisk indicating it's required
+      const firstNameLabel = screen.getByText(/first name/i);
+      expect(firstNameLabel.parentElement?.textContent).toContain('*');
+    });
+  });
+
+  describe('Form State', () => {
+    it('disables submit button when form is pristine', async () => {
+      renderWithProvider(<ProfileSettingsForm />);
+
+      await waitFor(() => {
+        const submitButton = screen.getByRole('button', { name: /save changes/i });
+        expect(submitButton).toBeDisabled();
+      });
+    });
+
+    it('disables inputs while submitting', async () => {
+      mockUseUpdateProfile.mockReturnValue({
+        mutateAsync: mockMutateAsync,
+        isPending: true,
+        isError: false,
+        isSuccess: false,
+        error: null,
+      });
+
+      renderWithProvider(<ProfileSettingsForm />);
+
+      await waitFor(() => {
+        const firstNameInput = screen.getByLabelText(/first name/i);
+        expect(firstNameInput).toBeDisabled();
+      });
+    });
+
+    it('shows loading text while submitting', async () => {
+      mockUseUpdateProfile.mockReturnValue({
+        mutateAsync: mockMutateAsync,
+        isPending: true,
+        isError: false,
+        isSuccess: false,
+        error: null,
+      });
+
+      renderWithProvider(<ProfileSettingsForm />);
+
+      await waitFor(() => {
+        expect(screen.getByText(/saving/i)).toBeInTheDocument();
+      });
+    });
+  });
+});

frontend/tests/components/settings/SessionCard.test.tsx

@@ -0,0 +1,144 @@
+/**
+ * Tests for SessionCard Component
+ */
+
+import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import { SessionCard } from '@/components/settings/SessionCard';
+import type { Session } from '@/lib/api/hooks/useSession';
+
+describe('SessionCard', () => {
+  const mockOnRevoke = jest.fn();
+
+  const currentSession: Session = {
+    id: '1',
+    device_name: 'Chrome on Mac',
+    ip_address: '192.168.1.1',
+    location_city: 'San Francisco',
+    location_country: 'USA',
+    last_used_at: '2024-01-01T12:00:00Z',
+    created_at: '2024-01-01T00:00:00Z',
+    expires_at: '2024-01-08T00:00:00Z',
+    is_current: true,
+  };
+
+  const otherSession: Session = {
+    ...currentSession,
+    id: '2',
+    device_name: 'Firefox on Windows',
+    location_city: 'New York',
+    is_current: false,
+  };
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('renders session information', () => {
+    render(<SessionCard session={currentSession} onRevoke={mockOnRevoke} />);
+
+    expect(screen.getByText('Chrome on Mac')).toBeInTheDocument();
+    expect(screen.getByText(/San Francisco.*USA/)).toBeInTheDocument();
+    expect(screen.getByText('192.168.1.1')).toBeInTheDocument();
+  });
+
+  it('shows current session badge', () => {
+    render(<SessionCard session={currentSession} onRevoke={mockOnRevoke} />);
+    expect(screen.getByText('Current Session')).toBeInTheDocument();
+  });
+
+  it('does not show revoke button for current session', () => {
+    render(<SessionCard session={currentSession} onRevoke={mockOnRevoke} />);
+    expect(screen.queryByRole('button', { name: /revoke/i })).not.toBeInTheDocument();
+  });
+
+  it('shows revoke button for other sessions', () => {
+    render(<SessionCard session={otherSession} onRevoke={mockOnRevoke} />);
+    expect(screen.getByRole('button', { name: /revoke/i })).toBeInTheDocument();
+  });
+
+  it('opens confirmation dialog on revoke click', async () => {
+    render(<SessionCard session={otherSession} onRevoke={mockOnRevoke} />);
+
+    fireEvent.click(screen.getByRole('button', { name: /revoke/i }));
+
+    await waitFor(() => {
+      expect(screen.getByText('Revoke Session?')).toBeInTheDocument();
+    });
+  });
+
+  it('calls onRevoke when confirmed', async () => {
+    render(<SessionCard session={otherSession} onRevoke={mockOnRevoke} />);
+
+    fireEvent.click(screen.getByRole('button', { name: /revoke/i }));
+
+    await waitFor(() => {
+      expect(screen.getByText('Revoke Session?')).toBeInTheDocument();
+    });
+
+    const confirmButton = screen.getByRole('button', { name: /revoke session/i });
+    fireEvent.click(confirmButton);
+
+    await waitFor(() => {
+      expect(mockOnRevoke).toHaveBeenCalledWith('2');
+    });
+  });
+
+  it('closes dialog on cancel', async () => {
+    render(<SessionCard session={otherSession} onRevoke={mockOnRevoke} />);
+
+    fireEvent.click(screen.getByRole('button', { name: /revoke/i }));
+
+    await waitFor(() => {
+      expect(screen.getByText('Revoke Session?')).toBeInTheDocument();
+    });
+
+    fireEvent.click(screen.getByRole('button', { name: /cancel/i }));
+
+    await waitFor(() => {
+      expect(screen.queryByText('Revoke Session?')).not.toBeInTheDocument();
+    });
+
+    expect(mockOnRevoke).not.toHaveBeenCalled();
+  });
+
+  it('handles missing location gracefully', () => {
+    const sessionWithoutLocation: Session = {
+      ...otherSession,
+      location_city: null,
+      location_country: null,
+    };
+
+    render(<SessionCard session={sessionWithoutLocation} onRevoke={mockOnRevoke} />);
+
+    expect(screen.queryByText(/San Francisco/)).not.toBeInTheDocument();
+    // Component hides location when unknown, so it should not be displayed
+    expect(screen.queryByText(/location/i)).not.toBeInTheDocument();
+  });
+
+  it('handles missing device name gracefully', () => {
+    const sessionWithoutDevice: Session = {
+      ...otherSession,
+      device_name: null,
+    };
+
+    render(<SessionCard session={sessionWithoutDevice} onRevoke={mockOnRevoke} />);
+
+    expect(screen.getByText('Unknown device')).toBeInTheDocument();
+  });
+
+  it('disables revoke button while revoking', () => {
+    render(<SessionCard session={otherSession} onRevoke={mockOnRevoke} isRevoking />);
+
+    const revokeButton = screen.getByRole('button', { name: /revoke/i });
+    expect(revokeButton).toBeDisabled();
+  });
+
+  it('highlights current session with border', () => {
+    const { container } = render(
+      <SessionCard session={currentSession} onRevoke={mockOnRevoke} />
+    );
+
+    const card = container.querySelector('.border-primary');
+    expect(card).toBeInTheDocument();
+  });
+});

frontend/tests/components/settings/SessionsManager.test.tsx

@@ -0,0 +1,258 @@
+/**
+ * Tests for SessionsManager Component
+ */
+
+import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { SessionsManager } from '@/components/settings/SessionsManager';
+import * as useSessionModule from '@/lib/api/hooks/useSession';
+
+jest.mock('@/lib/api/hooks/useSession');
+jest.mock('sonner', () => ({ toast: { success: jest.fn(), error: jest.fn() } }));
+
+const mockUseListSessions = useSessionModule.useListSessions as jest.Mock;
+const mockUseRevokeSession = useSessionModule.useRevokeSession as jest.Mock;
+const mockUseRevokeAllOtherSessions = useSessionModule.useRevokeAllOtherSessions as jest.Mock;
+
+describe('SessionsManager', () => {
+  let queryClient: QueryClient;
+  const mockRevokeMutate = jest.fn();
+  const mockRevokeAllMutate = jest.fn();
+
+  const mockSessions = [
+    {
+      id: '1',
+      device_name: 'Chrome on Mac',
+      ip_address: '192.168.1.1',
+      location_city: 'San Francisco',
+      location_country: 'USA',
+      last_used_at: '2024-01-01T12:00:00Z',
+      created_at: '2024-01-01T00:00:00Z',
+      expires_at: '2024-01-08T00:00:00Z',
+      is_current: true,
+    },
+    {
+      id: '2',
+      device_name: 'Firefox on Windows',
+      ip_address: '192.168.1.2',
+      location_city: 'New York',
+      location_country: 'USA',
+      last_used_at: '2024-01-01T11:00:00Z',
+      created_at: '2023-12-31T00:00:00Z',
+      expires_at: '2024-01-07T00:00:00Z',
+      is_current: false,
+    },
+  ];
+
+  beforeEach(() => {
+    queryClient = new QueryClient({
+      defaultOptions: { queries: { retry: false }, mutations: { retry: false } },
+    });
+
+    jest.clearAllMocks();
+
+    mockUseRevokeSession.mockReturnValue({
+      mutate: mockRevokeMutate,
+      isPending: false,
+    });
+
+    mockUseRevokeAllOtherSessions.mockReturnValue({
+      mutate: mockRevokeAllMutate,
+      isPending: false,
+    });
+  });
+
+  const renderWithProvider = (component: React.ReactElement) =>
+    render(<QueryClientProvider client={queryClient}>{component}</QueryClientProvider>);
+
+  it('shows loading state', () => {
+    mockUseListSessions.mockReturnValue({
+      data: undefined,
+      isLoading: true,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    expect(screen.getByText(/loading your active sessions/i)).toBeInTheDocument();
+  });
+
+  it('shows error state', () => {
+    mockUseListSessions.mockReturnValue({
+      data: undefined,
+      isLoading: false,
+      error: new Error('Failed to load'),
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    expect(screen.getByText(/unable to load your sessions/i)).toBeInTheDocument();
+  });
+
+  it('renders sessions list', () => {
+    mockUseListSessions.mockReturnValue({
+      data: mockSessions,
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    expect(screen.getByText('Chrome on Mac')).toBeInTheDocument();
+    expect(screen.getByText('Firefox on Windows')).toBeInTheDocument();
+  });
+
+  it('shows "Revoke All Others" button when multiple sessions exist', () => {
+    mockUseListSessions.mockReturnValue({
+      data: mockSessions,
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    expect(screen.getByRole('button', { name: /revoke all others/i })).toBeInTheDocument();
+  });
+
+  it('does not show "Revoke All Others" when only current session', () => {
+    mockUseListSessions.mockReturnValue({
+      data: [mockSessions[0]], // Only current session
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    expect(
+      screen.queryByRole('button', { name: /revoke all others/i })
+    ).not.toBeInTheDocument();
+  });
+
+  it('opens bulk revoke dialog', async () => {
+    mockUseListSessions.mockReturnValue({
+      data: mockSessions,
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    fireEvent.click(screen.getByRole('button', { name: /revoke all others/i }));
+
+    await waitFor(() => {
+      expect(screen.getByText('Revoke All Other Sessions?')).toBeInTheDocument();
+    });
+  });
+
+  it('calls bulk revoke when confirmed', async () => {
+    mockUseListSessions.mockReturnValue({
+      data: mockSessions,
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    fireEvent.click(screen.getByRole('button', { name: /revoke all others/i }));
+
+    await waitFor(() => {
+      expect(screen.getByText('Revoke All Other Sessions?')).toBeInTheDocument();
+    });
+
+    // Find the destructive button in the dialog (not the "Cancel" button)
+    const buttons = screen.getAllByRole('button');
+    const confirmButton = buttons.find(btn => btn.textContent === 'Revoke All Others');
+
+    if (confirmButton) {
+      fireEvent.click(confirmButton);
+    }
+
+    expect(mockRevokeAllMutate).toHaveBeenCalled();
+  });
+
+  it('calls revoke when individual session revoke clicked', async () => {
+    mockUseListSessions.mockReturnValue({
+      data: mockSessions,
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    // Click the individual "Revoke" button (not "Revoke All Others")
+    const revokeButtons = screen.getAllByRole('button', { name: /^revoke$/i });
+    fireEvent.click(revokeButtons[0]);
+
+    await waitFor(() => {
+      expect(screen.getByText('Revoke Session?')).toBeInTheDocument();
+    });
+
+    const confirmButton = screen.getByRole('button', { name: /revoke session/i });
+    fireEvent.click(confirmButton);
+
+    expect(mockRevokeMutate).toHaveBeenCalledWith('2');
+  });
+
+  it('shows empty state when no sessions', () => {
+    mockUseListSessions.mockReturnValue({
+      data: [],
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    expect(screen.getByText('No active sessions to display')).toBeInTheDocument();
+  });
+
+  it('shows info message when only one session', () => {
+    mockUseListSessions.mockReturnValue({
+      data: [mockSessions[0]],
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    expect(
+      screen.getByText(/you're viewing your only active session/i)
+    ).toBeInTheDocument();
+  });
+
+  it('shows security tip', () => {
+    mockUseListSessions.mockReturnValue({
+      data: mockSessions,
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    expect(screen.getByText(/security tip/i)).toBeInTheDocument();
+    expect(
+      screen.getByText(/if you see a session you don't recognize/i)
+    ).toBeInTheDocument();
+  });
+
+  it('closes bulk revoke dialog on cancel', async () => {
+    mockUseListSessions.mockReturnValue({
+      data: mockSessions,
+      isLoading: false,
+      error: null,
+    });
+
+    renderWithProvider(<SessionsManager />);
+
+    fireEvent.click(screen.getByRole('button', { name: /revoke all others/i }));
+
+    await waitFor(() => {
+      expect(screen.getByText('Revoke All Other Sessions?')).toBeInTheDocument();
+    });
+
+    fireEvent.click(screen.getByRole('button', { name: /cancel/i }));
+
+    await waitFor(() => {
+      expect(screen.queryByText('Revoke All Other Sessions?')).not.toBeInTheDocument();
+    });
+  });
+});