@@ -0,0 +1,86 @@
+import { render, screen, fireEvent } from "@testing-library/react";
+import { useTransition } from "react";
+import { useSearchParams } from "next/navigation";
+import { useLocale, useTranslations } from "next-intl";
+import LocaleSwitcher from "../LocaleSwitcher";
+
+// Mock next-intl
+jest.mock("next-intl", () => ({
+  useLocale: jest.fn(),
+  useTranslations: jest.fn(),
+}));
+
+// Mock next/navigation
+jest.mock("next/navigation", () => ({
+  useSearchParams: jest.fn(),
+}));
+
+// Mock i18n navigation
+jest.mock("@/i18n/navigation", () => ({
+  usePathname: jest.fn(() => "/"),
+  useRouter: jest.fn(() => ({
+    replace: jest.fn(),
+  })),
+}));
+
+// Mock i18n config
+jest.mock("@/i18n/config", () => ({
+  localeCookieMaxAge: 31536000,
+  localeCookieName: "NEXT_LOCALE",
+  locales: ["en", "es", "fr"],
+  resolveAppLocale: (locale: string) => locale,
+}));
+
+describe("LocaleSwitcher", () => {
+  const mockReplace = jest.fn();
+  const mockStartTransition = jest.fn();
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    (useLocale as jest.Mock).mockReturnValue("en");
+    (useTranslations as jest.Mock).mockReturnValue((key: string) => key);
+    (useSearchParams as jest.Mock).mockReturnValue(new URLSearchParams());
+    (useTransition as jest.Mock).mockReturnValue([false, mockStartTransition]);
+    const { useRouter } = jest.requireMock("@/i18n/navigation");
+    useRouter.mockReturnValue({ replace: mockReplace });
+  });
+
+  it("renders locale options", () => {
+    render(<LocaleSwitcher />);
+
+    expect(screen.getByText("label")).toBeInTheDocument();
+    expect(screen.getByRole("combobox")).toBeInTheDocument();
+  });
+
+  it("displays current locale as selected", () => {
+    render(<LocaleSwitcher />);
+
+    const select = screen.getByRole("combobox") as HTMLSelectElement;
+    expect(select.value).toBe("en");
+  });
+
+  it("calls handleChange when locale is changed", () => {
+    render(<LocaleSwitcher />);
+
+    const select = screen.getByRole("combobox");
+    fireEvent.change(select, { target: { value: "es" } });
+
+    expect(mockStartTransition).toHaveBeenCalled();
+  });
+
+  it("is disabled when pending", () => {
+    (useTransition as jest.Mock).mockReturnValue([true, mockStartTransition]);
+
+    render(<LocaleSwitcher />);
+
+    const select = screen.getByRole("combobox") as HTMLSelectElement;
+    expect(select.disabled).toBe(true);
+  });
+
+  it("has proper aria-label", () => {
+    render(<LocaleSwitcher />);
+
+    const select = screen.getByRole("combobox");
+    expect(select).toHaveAttribute("aria-label", "ariaLabel");
+  });
+});