diff --git a/tests/store.test.ts b/tests/store.test.ts
new file mode 100644
index 0000000..0478ed9
--- /dev/null
+++ b/tests/store.test.ts
@@ -0,0 +1,88 @@
+import { beforeEach, describe, expect, it } from '@jest/globals';
+import { AuthUser } from '../src/services/mobileAuth';
+import { useAppStore } from '../src/store';
+
+describe('useAppStore Actions', () => {
+  // Setup: Reset store before each test to ensure test isolation
+  beforeEach(() => {
+    useAppStore.setState({
+      user: null,
+      isAuthenticated: false,
+      isAuthLoading: false,
+      authError: null,
+      accessToken: null,
+      refreshToken: null,
+      sessionExpiresAt: null,
+      theme: 'light',
+    });
+  });
+
+  it('should set auth loading status', () => {
+    useAppStore.getState().setAuthLoading(true);
+    expect(useAppStore.getState().isAuthLoading).toBe(true);
+
+    useAppStore.getState().setAuthLoading(false);
+    expect(useAppStore.getState().isAuthLoading).toBe(false);
+  });
+
+  it('should set auth error message', () => {
+    const errorMessage = 'Invalid email or password';
+    useAppStore.getState().setAuthError(errorMessage);
+    expect(useAppStore.getState().authError).toBe(errorMessage);
+
+    useAppStore.getState().setAuthError(null);
+    expect(useAppStore.getState().authError).toBeNull();
+  });
+
+  it('should set user and update authentication status', () => {
+    const mockUser: AuthUser = { id: 'u1', name: 'Test User', email: 'test@example.com' };
+    
+    useAppStore.getState().setUser(mockUser);
+    
+    const state = useAppStore.getState();
+    expect(state.user).toEqual(mockUser);
+    expect(state.isAuthenticated).toBe(true);
+  });
+
+  it('should set tokens correctly', () => {
+    const expiresAt = Date.now() + 3600000; // 1 hour from now
+    useAppStore.getState().setTokens('access-123', 'refresh-456', expiresAt);
+
+    const state = useAppStore.getState();
+    expect(state.accessToken).toBe('access-123');
+    expect(state.refreshToken).toBe('refresh-456');
+    expect(state.sessionExpiresAt).toBe(expiresAt);
+  });
+
+  it('should clear user and token data on logout', () => {
+    // Pre-populate state as an active session
+    useAppStore.setState({
+      user: { id: 'u1', name: 'Test User', email: 'test@example.com' } as AuthUser,
+      isAuthenticated: true,
+      accessToken: 'access-123',
+      refreshToken: 'refresh-456',
+      sessionExpiresAt: Date.now() + 3600000,
+      theme: 'dark', 
+    });
+
+    useAppStore.getState().logout();
+
+    const state = useAppStore.getState();
+    expect(state.user).toBeNull();
+    expect(state.isAuthenticated).toBe(false);
+    expect(state.accessToken).toBeNull();
+    expect(state.refreshToken).toBeNull();
+    expect(state.sessionExpiresAt).toBeNull();
+    
+    // Application preferences like theme should persist across logouts
+    expect(state.theme).toBe('dark');
+  });
+
+  it('should set app theme', () => {
+    useAppStore.getState().setTheme('dark');
+    expect(useAppStore.getState().theme).toBe('dark');
+
+    useAppStore.getState().setTheme('light');
+    expect(useAppStore.getState().theme).toBe('light');
+  });
+});
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