test(desktop): 前端单元 + 关键组件测试（Vitest + RTL，31 例）

测试基建：vite.config.ts 加 test 配置（jsdom + setup），package.json 加
test/test:watch 脚本，src/test/setup.ts 引 jest-dom；tsconfig 把测试文件 exclude，
使 CI 现有 tsc --noEmit 不检查测试文件（仍绿），测试由 Vitest 自跑（先不接 CI）。

覆盖（31 例 / 4 文件）：
- dsl：exportDsl 节点/边映射 + config 兜底 + branch 真假边 sourceHandle 条件；
  validate 空画布/孤立节点/必填项缺失。
- version：isNewer 版本比较矩阵；checkUpdate 有更新/同版/旧版/404限流/离线异常；
  openExternal Wails / 浏览器双路径。
- run：deriveNodes start→running、end→done+耗时、error、error 不被 start 覆盖、
  info 累计 notes、首现顺序、label 更新。
- UpdateBanner（RTL）：无更新不渲染、有更新显版本+点下载调 openExternal、点忽略消失。

小改：version.ts 导出 isNewer（原私有）以便直接测版本判定矩阵。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

sundynix-desktop/frontend/src/lib/dsl.test.ts

@@ -0,0 +1,60 @@
+import { describe, it, expect } from "vitest";
+import type { Node, Edge } from "@xyflow/react";
+import { exportDsl, validate } from "./dsl";
+
+// 构造画布节点的小工具（只填导出/校验关心的字段）。
+function node(id: string, kind: string, config?: unknown, label?: string): Node {
+  return { id, position: { x: 0, y: 0 }, data: { kind, label, config } } as unknown as Node;
+}
+function edge(source: string, target: string, sourceHandle?: string): Edge {
+  return { id: `${source}-${target}`, source, target, sourceHandle } as unknown as Edge;
+}
+
+describe("exportDsl", () => {
+  it("把节点映射为 {id,kind,label,config}", () => {
+    const dsl = exportDsl([node("in", "input", { text: "hi" }, "输入")], []);
+    expect(dsl.version).toBe("1");
+    expect(dsl.nodes).toEqual([{ id: "in", kind: "input", label: "输入", config: { text: "hi" } }]);
+  });
+
+  it("缺失 config 时回退为空对象", () => {
+    const dsl = exportDsl([node("in", "input")], []);
+    expect(dsl.nodes[0].config).toEqual({});
+  });
+
+  it("仅在存在 sourceHandle 时才带上该字段（branch 真/假边）", () => {
+    const dsl = exportDsl(
+      [node("b", "branch"), node("t", "agent"), node("f", "agent")],
+      [edge("b", "t", "true"), edge("b", "f")],
+    );
+    expect(dsl.edges[0]).toEqual({ source: "b", target: "t", sourceHandle: "true" });
+    expect(dsl.edges[1]).toEqual({ source: "b", target: "f" });
+    expect("sourceHandle" in dsl.edges[1]).toBe(false);
+  });
+});
+
+describe("validate", () => {
+  it("空画布报 error", () => {
+    const issues = validate([], []);
+    expect(issues).toHaveLength(1);
+    expect(issues[0].level).toBe("error");
+  });
+
+  it("单节点不报孤立警告（length>1 才校验连线）", () => {
+    const issues = validate([node("in", "input", { text: "hi" })], []);
+    expect(issues.some((i) => i.msg.includes("孤立"))).toBe(false);
+  });
+
+  it("多节点中未连线的节点报孤立 warn", () => {
+    const issues = validate(
+      [node("a", "input", { text: "hi" }), node("b", "agent", { system: "x" })],
+      [], // 都没连
+    );
+    expect(issues.filter((i) => i.msg.includes("孤立"))).toHaveLength(2);
+  });
+
+  it("必填项缺失报 warn（input.text 为必填）", () => {
+    const issues = validate([node("in", "input", { text: "" })], []);
+    expect(issues.some((i) => i.level === "warn" && i.msg.includes("缺必填项"))).toBe(true);
+  });
+});