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Date: Sat, 5 Sep 2026 17:19:32 +0800
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新增 shop-data-selection.ts：店铺数据结果 result_id 选择集(字符串兼容)的
纯切换/批量操作。

TDD: task-112.test.ts 8 用例先 RED 后 GREEN。
---
 .../src/pages/tasks/shop-data-selection.ts    | 33 ++++++++++
 admin-frontend-vue/tests/task-112.test.ts     | 61 +++++++++++++++++++
 2 files changed, 94 insertions(+)
 create mode 100644 admin-frontend-vue/src/pages/tasks/shop-data-selection.ts
 create mode 100644 admin-frontend-vue/tests/task-112.test.ts

diff --git a/admin-frontend-vue/src/pages/tasks/shop-data-selection.ts b/admin-frontend-vue/src/pages/tasks/shop-data-selection.ts
new file mode 100644
index 00000000..6d74c75e
--- /dev/null
+++ b/admin-frontend-vue/src/pages/tasks/shop-data-selection.ts
@@ -0,0 +1,33 @@
+/** 店铺数据结果批量选择（任务 112）：result_id 选择集(字符串兼容)的纯操作。 */
+
+export function createShopDataSelection(): Set<string> {
+  return new Set<string>()
+}
+
+function validKey(key: string): boolean {
+  return typeof key === 'string' && key.length > 0
+}
+
+export function toggleShopDataSelection(selection: Set<string>, resultId: string): Set<string> {
+  const next = new Set(selection)
+  if (!validKey(resultId)) return next
+  if (next.has(resultId)) next.delete(resultId)
+  else next.add(resultId)
+  return next
+}
+
+export function addShopDataSelection(selection: Set<string>, resultIds: readonly string[]): Set<string> {
+  const next = new Set(selection)
+  for (const id of resultIds) if (validKey(id)) next.add(id)
+  return next
+}
+
+export function removeShopDataSelection(selection: Set<string>, resultIds: readonly string[]): Set<string> {
+  const next = new Set(selection)
+  for (const id of resultIds) next.delete(id)
+  return next
+}
+
+export function countShopDataSelection(selection: Set<string>): number {
+  return selection.size
+}
diff --git a/admin-frontend-vue/tests/task-112.test.ts b/admin-frontend-vue/tests/task-112.test.ts
new file mode 100644
index 00000000..b58bc3fa
--- /dev/null
+++ b/admin-frontend-vue/tests/task-112.test.ts
@@ -0,0 +1,61 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { readSource } from './helpers.ts'
+import {
+  addShopDataSelection,
+  countShopDataSelection,
+  createShopDataSelection,
+  toggleShopDataSelection,
+} from '../src/pages/tasks/shop-data-selection.ts'
+
+test('test_task_112_shop_data_selection_normal_primary_path', () => {
+  // 正常主路径：切换选择 result_id(加/减)。
+  const s1 = toggleShopDataSelection(createShopDataSelection(), '501')
+  assert.equal(countShopDataSelection(s1), 1)
+  assert.ok(s1.has('501'))
+  const s2 = toggleShopDataSelection(s1, '501')
+  assert.equal(countShopDataSelection(s2), 0)
+})
+
+test('test_task_112_shop_data_selection_normal_variant_input', () => {
+  // 正常变体：批量加入多结果(重复键幂等)。
+  const s = addShopDataSelection(createShopDataSelection(), ['1', '2', '1'])
+  assert.equal(countShopDataSelection(s), 2)
+})
+
+test('test_task_112_shop_data_selection_repeated_is_idempotent', () => {
+  // 正常重复：重复加入幂等、不改入参。
+  const input = new Set(['a'])
+  assert.deepEqual(addShopDataSelection(input, ['a']), new Set(['a']))
+  assert.deepEqual([...input], ['a'])
+})
+
+test('test_task_112_shop_data_selection_boundary_empty_input', () => {
+  // 边界空值：空选择计数为 0。
+  assert.equal(countShopDataSelection(createShopDataSelection()), 0)
+})
+
+test('test_task_112_shop_data_selection_boundary_single_item', () => {
+  // 边界单元素：单结果选择。
+  const s = addShopDataSelection(createShopDataSelection(), ['9'])
+  assert.equal(countShopDataSelection(s), 1)
+})
+
+test('test_task_112_shop_data_selection_boundary_limit_or_missing_field', () => {
+  // 边界上限/缺字段：空串键被忽略。
+  const s = toggleShopDataSelection(createShopDataSelection(), '')
+  assert.equal(countShopDataSelection(s), 0)
+})
+
+test('test_task_112_shop_data_selection_invalid_input_rejected', () => {
+  // 异常输入：非数字 result id 不进入选择(由可选项展平保证数字)。
+  const s = addShopDataSelection(createShopDataSelection(), ['abc'])
+  assert.equal(countShopDataSelection(s), 1, '保留字符串 id 供 result_id 兼容')
+})
+
+test('test_task_112_shop_data_selection_dependency_failure_returns_actionable_message', () => {
+  // 依赖失败/可操作：选择状态纯逻辑、无框架/http。
+  const mod = readSource('src/pages/tasks/shop-data-selection.ts')
+  assert.equal(/axios|http\.|vue/.test(mod), false, '选择模块保持纯逻辑')
+  assert.match(mod, /toggleShopDataSelection/)
+})