feat: 新增 validateTaskFormat 校验函数

tests/core/task-parser.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from "bun:test";
-import { parseTasks } from "../../src/core/task-parser.ts";
+import { parseTasks, validateTaskFormat, TaskFormatError } from "../../src/core/task-parser.ts";
 
 describe("parseTasks", () => {
   it("解析标准 checkbox 格式", () => {
@@ -52,3 +52,29 @@ describe("parseTasks", () => {
     expect(tasks.length).toBe(3);
   });
 });
+
+describe("validateTaskFormat", () => {
+  it("合法 task 内容通过校验", () => {
+    expect(() => validateTaskFormat("- [x] 已完成\n- [ ] 未完成")).not.toThrow();
+  });
+
+  it("无 checkbox 项时抛错", () => {
+    expect(() => validateTaskFormat("# 标题\n一些描述")).toThrow(TaskFormatError);
+  });
+
+  it("空内容抛错", () => {
+    expect(() => validateTaskFormat("")).toThrow(TaskFormatError);
+  });
+
+  it("checkbox 文本为空时抛错", () => {
+    expect(() => validateTaskFormat("- [ ] \n- [x] 有内容")).toThrow(TaskFormatError);
+  });
+
+  it("checkbox 文本仅空格时抛错", () => {
+    expect(() => validateTaskFormat("- [ ]   ")).toThrow(TaskFormatError);
+  });
+
+  it("有 checkbox 且文本非空时通过", () => {
+    expect(() => validateTaskFormat("- [ ] 实现功能A")).not.toThrow();
+  });
+});