test: add frontend test suite

src/utils/categoryDisplay.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, it } from "vitest";
+import { categoryCardLines } from "./categoryDisplay";
+
+describe("categoryCardLines", () => {
+  it("splits Chinese and ASCII parenthetical subtitles", () => {
+    expect(categoryCardLines("官方公告（繁中）")).toEqual({
+      line1: "官方公告",
+      line2: "（繁中）",
+    });
+    expect(categoryCardLines("Tutorials (EN)")).toEqual({
+      line1: "Tutorials",
+      line2: "(EN)",
+    });
+  });
+
+  it("uses trimmed description as subtitle when name has no parentheses", () => {
+    expect(categoryCardLines("影片", " 官方教學 ")).toEqual({
+      line1: "影片",
+      line2: "官方教學",
+    });
+    expect(categoryCardLines("文件")).toEqual({ line1: "文件" });
+  });
+});