diff --git a/src/api/client.js b/src/api/client.js
index df5d38f..7a90a58 100644
--- a/src/api/client.js
+++ b/src/api/client.js
@@ -88,6 +88,8 @@ apiClient.interceptors.response.use(
 
       // Refresh failed: clear auth and redirect to login
       deleteCookie("luciaToken");
+      deleteCookie("luciaRefreshToken");
+      deleteCookie("isLuciaLoggedIn");
       window.location.href = "/login";
       return Promise.reject(refreshError);
     }
diff --git a/tests/api/client.test.js b/tests/api/client.test.js
new file mode 100644
index 0000000..1918c4c
--- /dev/null
+++ b/tests/api/client.test.js
@@ -0,0 +1,56 @@
+// The Lucia project.
+// Copyright 2026-2026 DSP, inc.  All rights reserved.
+// Authors:
+//   imacat.yang@dsp.im (imacat), 2026/03/08
+
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+const { mockAxiosCreate, mockRequestUse, mockResponseUse, mockDeleteCookie } =
+  vi.hoisted(() => ({
+    mockAxiosCreate: vi.fn(),
+    mockRequestUse: vi.fn(),
+    mockResponseUse: vi.fn(),
+    mockDeleteCookie: vi.fn(),
+  }));
+
+vi.mock("axios", () => ({
+  default: {
+    create: mockAxiosCreate,
+  },
+}));
+
+vi.mock("@/utils/cookieUtil.js", () => ({
+  getCookie: vi.fn(() => null),
+  deleteCookie: mockDeleteCookie,
+}));
+
+vi.mock("@/api/auth.js", () => ({
+  refreshTokenAndGetNew: vi.fn().mockRejectedValue(new Error("401")),
+}));
+
+describe("apiClient response interceptor", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockAxiosCreate.mockReturnValue({
+      interceptors: {
+        request: { use: mockRequestUse },
+        response: { use: mockResponseUse },
+      },
+    });
+  });
+
+  it("clears all auth cookies when token refresh fails", async () => {
+    await import("@/api/client.js");
+    const rejectedHandler = mockResponseUse.mock.calls[0][1];
+    await expect(
+      rejectedHandler({
+        response: { status: 401 },
+        config: { url: "/api/my-account", headers: {} },
+      }),
+    ).rejects.toThrow("401");
+
+    expect(mockDeleteCookie).toHaveBeenCalledWith("luciaToken");
+    expect(mockDeleteCookie).toHaveBeenCalledWith("luciaRefreshToken");
+    expect(mockDeleteCookie).toHaveBeenCalledWith("isLuciaLoggedIn");
+  });
+});