flutter/packages/flutter_tools/templates/plugin/test/projectName_test.dart.tmpl

import 'package:flutter_test/flutter_test.dart';
import 'package:{{projectName}}/{{projectName}}.dart';
import 'package:{{projectName}}/{{projectName}}_platform_interface.dart';
import 'package:{{projectName}}/{{projectName}}_method_channel.dart';
import 'package:plugin_platform_interface/plugin_platform_interface.dart';

class Mock{{pluginDartClass}}Platform
    with MockPlatformInterfaceMixin
    implements {{pluginDartClass}}Platform {

  @override
  Future<String?> getPlatformVersion() => Future.value('42');
}

void main() {
  final {{pluginDartClass}}Platform initialPlatform = {{pluginDartClass}}Platform.instance;

  test('$MethodChannel{{pluginDartClass}} is the default instance', () {
    expect(initialPlatform, isInstanceOf<MethodChannel{{pluginDartClass}}>());
  });

  test('getPlatformVersion', () async {
    {{pluginDartClass}} {{pluginClassLowerCamelCase}} = {{pluginDartClass}}();
    Mock{{pluginDartClass}}Platform fakePlatform = Mock{{pluginDartClass}}Platform();
    {{pluginDartClass}}Platform.instance = fakePlatform;

    expect(await {{pluginClassLowerCamelCase}}.getPlatformVersion(), '42');
  });
}