packages/flutter/test/material/debug_test.dart

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('debugCheckHasMaterial control test', (WidgetTester tester) async {
    await tester.pumpWidget(const FlatButton(
      onPressed: null,
      child: const Text('Go'),
    ));
    expect(tester.takeException(), isFlutterError);
  });
}