API 키 페이지 locale 전환 시 /api-keys 404 방지

adminfront/src/components/common/LanguageSelector.test.tsx

@@ -0,0 +1,32 @@
+import { render, screen, fireEvent } from "@testing-library/react";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import LanguageSelector from "./LanguageSelector";
+
+vi.mock("../../lib/i18n", () => ({
+  t: (_key: string, fallback?: string) => fallback ?? "",
+}));
+
+describe("LanguageSelector", () => {
+  beforeEach(() => {
+    window.localStorage.clear();
+    vi.restoreAllMocks();
+  });
+
+  it("updates locale without reloading the page", () => {
+    const dispatchSpy = vi.spyOn(window, "dispatchEvent");
+    window.localStorage.setItem("locale", "ko");
+
+    render(<LanguageSelector />);
+
+    fireEvent.change(screen.getByRole("combobox"), {
+      target: { value: "en" },
+    });
+
+    expect(window.localStorage.getItem("locale")).toBe("en");
+    expect(
+      dispatchSpy.mock.calls.some(
+        ([event]) => event instanceof Event && event.type === "localechange",
+      ),
+    ).toBe(true);
+  });
+});