jiu/client/test/stock_in_search_debounce_test.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:jiu_client/core/api/api_client.dart';
import 'package:jiu_client/core/models/page_result.dart';
import 'package:jiu_client/models/stock_in.dart';
import 'package:jiu_client/providers/stock_in_provider.dart';
import 'package:jiu_client/repositories/stock_in_repository.dart';

/// 统计 list() 调用次数与最后一次关键词的假仓库，用于验证搜索限流。
class _CountingStockInRepo extends StockInRepository {
  int listCalls = 0;
  String? lastKeyword;

  _CountingStockInRepo() : super(ApiClient(token: 't'));

  @override
  Future<PageResult<StockInOrder>> list({
    String? status,
    String? startDate,
    String? endDate,
    String? keyword,
    Map<String, String>? detail,
    int page = 1,
    int pageSize = 20,
  }) async {
    listCalls++;
    lastKeyword = keyword;
    return const PageResult<StockInOrder>(
        data: [], total: 0, page: 1, pageSize: 20);
  }
}

void main() {
  test('setKeyword 防抖：350ms 内连发只触发最后一次', () async {
    final repo = _CountingStockInRepo();
    final container = ProviderContainer(
      overrides: [stockInRepositoryProvider.overrideWithValue(repo)],
    );
    addTearDown(container.dispose);

    // 初次 build 自动拉一次列表
    await container.read(stockInListProvider.future);
    expect(repo.listCalls, 1);

    final notifier = container.read(stockInListProvider.notifier);

    // 350ms 内连发三个不同关键词
    notifier.setKeyword('茅');
    notifier.setKeyword('茅台');
    notifier.setKeyword('飞天茅台');

    // 防抖窗口未到 → 不应有新请求
    await Future<void>.delayed(const Duration(milliseconds: 120));
    expect(repo.listCalls, 1);

    // 过了防抖窗口 → 合并成 1 次，关键词取最后一个
    await Future<void>.delayed(const Duration(milliseconds: 350));
    expect(repo.listCalls, 2);
    expect(repo.lastKeyword, '飞天茅台');
  });

  test('setKeyword 去重：相同关键词不重复查询', () async {
    final repo = _CountingStockInRepo();
    final container = ProviderContainer(
      overrides: [stockInRepositoryProvider.overrideWithValue(repo)],
    );
    addTearDown(container.dispose);

    await container.read(stockInListProvider.future);
    final notifier = container.read(stockInListProvider.notifier);

    // 首次搜索「茅台」
    notifier.setKeyword('茅台');
    await Future<void>.delayed(const Duration(milliseconds: 400));
    expect(repo.listCalls, 2);
    expect(repo.lastKeyword, '茅台');

    // 再次搜索完全相同的关键词 → 直接 return，不发请求
    notifier.setKeyword('茅台');
    await Future<void>.delayed(const Duration(milliseconds: 400));
    expect(repo.listCalls, 2);
  });
}