初始化提交

frontend/src/components/chat/CharacterSwitcher.test.tsx

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+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { describe, expect, it, vi } from "vitest";
+
+vi.mock("next/navigation", () => ({
+  useRouter: () => ({ push: vi.fn(), replace: vi.fn() }),
+}));
+
+// 不触发实际的 API 调用
+vi.mock("@/lib/api", () => ({
+  charactersApi: {
+    listCharacters: vi.fn().mockResolvedValue({ items: [], total: 0 }),
+  },
+}));
+
+import { CharacterSwitcher } from "./CharacterSwitcher";
+
+describe("CharacterSwitcher", () => {
+  it("渲染当前人物名", () => {
+    render(
+      <CharacterSwitcher
+        currentCharacterId="char_1"
+        currentDisplayName="小测"
+      />,
+    );
+    expect(screen.getByText("小测")).toBeInTheDocument();
+  });
+
+  it("点击展开下拉菜单", async () => {
+    const user = userEvent.setup();
+    render(
+      <CharacterSwitcher
+        currentCharacterId="char_1"
+        currentDisplayName="小测"
+      />,
+    );
+    // 当前人物名可点击
+    await user.click(screen.getByText("小测"));
+    // dropdown 应该出现——因为 listCharacters 返回空列表，
+    // 此处只验证下拉渲染不报错
+    expect(screen.getByText("小测")).toBeInTheDocument();
+  });
+});