• 第一步的第一步的第一步：pubspec文件中添加依赖

1. 单元测试

dev_dependencies:
  flutter_test:
    sdk: flutter

• 测试全局方法

int sum(int a,int b){
  return a + b;
}
int mul(int a,int b){
  return a*b;
}

测试：

import 'package:cayj_cystudio/apptest/test_func.dart';
import 'package:flutter_test/flutter_test.dart';

void main(){
  group("测试组", (){
    test("测试test_func中的sum方法", (){
      final result = sum(1, 9);
      expect(result, 11);
    });
    test("测试test_func中的mul方法", (){
      final result = mul(1, 9);
      expect(result, 9);
    });
  });
}
不使用测试组也可以单独写：
  // test("测试test_func中的sum方法", (){
  //   final result = sum(1, 9);
  //   expect(result, 50);
  // });
  // test("测试test_func中的mul方法", (){
  //   final result = mul(1, 9);
  //   expect(result, 9);
  // });

• 测试全局类中的变量和方法

class Counter{
  int value = 0;
  int increment() => value++;
  int decrement() => value--;
}

测试：

import 'package:cayj_cystudio/apptest/test_func.dart';
import 'package:flutter_test/flutter_test.dart';

void main(){
  group("测试类", (){
    Counter counter;
    setUpAll((){
      counter = Counter();
    });

    group("测试方法", (){
      test("测试初始值", (){
        expect(counter.value, 0);
      });
      test("value++", (){
        counter.increment();
        expect(counter.value, 1);
      });
      test("value--", (){
        counter.decrement();
        expect(counter.value, 0);
      });
    });
  });
}

2. widget测试

widget:

class TestWidget extends StatelessWidget {
  final List<String> _names;
  TestWidget(this._names);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("test"),),
      body: ListView(
        children: _names.map((item){
          return ListTile(
            leading: Icon(Icons.stop),
            title: Text(item),
          );
        }).toList(),
      ),
    );
  }
}

测试：

void main(){
  testWidgets("测试widget", (WidgetTester tester) async{
    // 注入widget
    await tester.pumpWidget(MaterialApp(home: TestWidget(["cy","cy1"])));
    // 在TestWidget中查找Text
    final cyText = find.text("cy");
    final cy1Text = find.text("cy1");
    final icons = find.byIcon(Icons.stop);
    
    expect(cyText, findsOneWidget);
    expect(cy1Text, findsOneWidget);
    expect(icons, findsNWidgets(2));
  });
}

3. 集成测试

pudspec文件添加依赖

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_driver:
    sdk: flutter
  test: any

要测试的代码：

class TestTest extends StatefulWidget {
  @override
  _TestTestState createState() => _TestTestState();
}

class _TestTestState extends State<TestTest> {
  var _counter = 2;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("集成测试"),
      ),
      body: Column(
        children: [
          Text(_counter.toString(),key: ValueKey("numberKey")),
          RaisedButton(
            key: ValueKey("floatBtn"),
            child: Text("+"),
            onPressed: (){
              setState(() {
                _counter++;
              });
            },
          )
        ],
      ),
    );
  }
}

test文件路径下编辑集成测试启动文件:

import 'package:cayj_cystudio/main.dart' as app;
import 'package:flutter_driver/driver_extension.dart';

void main(){
  // 初始化Driver
  enableFlutterDriverExtension();
  // 运行程序
  app.main();
}

撰写集成测试代码：(通过valuekey绑定)

import 'package:flutter_driver/flutter_driver.dart';
import 'package:test/test.dart';//要使用这个引入，否则会报错ui:dart

void main(){
  group("集成测试", (){
    FlutterDriver driver;
    // 所有测试执行开始调用
    setUpAll(() async {
      driver = await FlutterDriver.connect();
    });
    // 获取text的值
    final number = find.byValueKey("numberKey");
    // 获取按钮
    final floatBtn = find.byValueKey("floatBtn");
    test("测试默认值", () async {
      expect(await driver.getText(number), "2");
    });
    test("测试按钮点击后的值", () async {
      await driver.tap(floatBtn);
      expect(await driver.getText(number), "3");
    });
    // 所有测试执行结束调用
    tearDownAll((){
      driver.close();
    });

  });
}

注：
文件名要以XXX_test.dart（_test）方式结尾

terminal中运行集成测试代码

flutter drive --target=test_driver/app.dart

liutiesngdeMBP2:cayj_cystudio liutiesong$ flutter drive --target=test_driver/app.dart
Using device iPhone 12.
Starting application: test_driver/app.dart
Running Xcode build...                                                  
                                                   
 └─Compiling, linking and signing...                         4.6s
Xcode build done.                                           16.7s
flutter: Observatory listening on http://127.0.0.1:56637/kaVeRZod69Q=/
00:00 +0: 集成测试 (setUpAll)

VMServiceFlutterDriver: Connecting to Flutter application at http://127.0.0.1:56637/kaVeRZod69Q=/
VMServiceFlutterDriver: Isolate found with number: 2082988028718143
VMServiceFlutterDriver: Isolate is paused at start.
VMServiceFlutterDriver: Attempting to resume isolate
VMServiceFlutterDriver: Waiting for service extension
flutter: 物理分辨率:1170.0 x 2532.0(宽 x 高)
flutter: 屏幕宽高：390.0 x 844.0(宽 x 高)
VMServiceFlutterDriver: Connected to Flutter application.
00:00 +0: 集成测试 测试默认值

00:00 +1: 集成测试 测试按钮点击后的值

00:01 +2: 集成测试 (tearDownAll)

00:01 +2: All tests passed!

Stopping application instance.
liutiesngdeMBP2:cayj_cystudio liutiesong$