water-management-system/mobile-app/test/features/auth/login_page_test.dart

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:provider/provider.dart';
import 'package:water_management_app/features/auth/pages/login_page.dart';
import 'package:water_management_app/features/auth/services/auth_provider.dart';

/// LoginPage widget 测试（对应 Issue #79 登录功能）。
///
/// 覆盖：页面渲染、表单校验、密码可见切换、记住用户名复选框。
void main() {
  // 轻量 AuthProvider 替身：避免触发 TokenService 的 SharedPreferences 依赖
  AuthProvider makeAuth() => AuthProvider();

  Widget makeApp({required AuthProvider auth}) {
    return ChangeNotifierProvider(
      create: (_) => auth,
      child: const MaterialApp(home: LoginPage()),
    );
  }

  testWidgets('登录页渲染标题与输入框', (tester) async {
    await tester.pumpWidget(makeApp(auth: makeAuth()));

    expect(find.text('供水管理系统'), findsOneWidget);
    expect(find.text('供水 · 巡检 · 营收'), findsOneWidget);
    expect(find.widgetWithText(TextFormField, '请输入用户名'), findsOneWidget);
    expect(find.text('登 录'), findsOneWidget);
  });

  testWidgets('空用户名提交时不通过校验', (tester) async {
    await tester.pumpWidget(makeApp(auth: makeAuth()));

    await tester.tap(find.text('登 录'));
    await tester.pump();
    expect(find.text('请输入用户名'), findsOneWidget);
  });

  testWidgets('密码短于6位显示校验错误', (tester) async {
    await tester.pumpWidget(makeApp(auth: makeAuth()));

    await tester.enterText(find.byType(TextFormField).first, 'admin');
    await tester.enterText(find.byType(TextFormField).last, '123');
    await tester.tap(find.text('登 录'));
    await tester.pump();
    expect(find.text('密码长度不能少于6位'), findsOneWidget);
  });

  testWidgets('点击密码可见图标切换 obscureText', (tester) async {
    await tester.pumpWidget(makeApp(auth: makeAuth()));

    // 初始密码隐藏
    TextFormField pwdField = tester.widget(find.byType(TextFormField).last);
    expect(pwdField.obscureText, isTrue);

    await tester.tap(find.byIcon(Icons.visibility_off));
    await tester.pump();
    pwdField = tester.widget(find.byType(TextFormField).last);
    expect(pwdField.obscureText, isFalse);

    // 再次点击恢复隐藏
    await tester.tap(find.byIcon(Icons.visibility));
    await tester.pump();
    pwdField = tester.widget(find.byType(TextFormField).last);
    expect(pwdField.obscureText, isTrue);
  });

  testWidgets('记住用户名复选框可切换', (tester) async {
    await tester.pumpWidget(makeApp(auth: makeAuth()));

    expect(find.text('记住用户名'), findsOneWidget);
    Checkbox checkbox = tester.widget(find.byType(Checkbox));
    expect(checkbox.value, isTrue); // 默认勾选

    await tester.tap(find.text('记住用户名'));
    await tester.pump();
    checkbox = tester.widget(find.byType(Checkbox));
    expect(checkbox.value, isFalse);
  });
}