flutter-go/packages/flutter_web/test/foundation/print_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_web/foundation.dart';
import 'package:quiver/testing/async.dart';
import '../flutter_test_alternative.dart';

import 'capture_output.dart';

void main() {
  test('debugPrint', () {
    expect(captureOutput(() {
      debugPrintSynchronously('Hello, world');
    }), equals(<String>['Hello, world']));

    expect(captureOutput(() {
      debugPrintSynchronously('Hello, world', wrapWidth: 10);
    }), equals(<String>['Hello,\nworld']));

    for (int i = 0; i < 14; ++i) {
      expect(captureOutput(() {
        debugPrintSynchronously('Hello,   world', wrapWidth: i);
      }), equals(<String>['Hello,\nworld']));
    }

    expect(captureOutput(() {
      debugPrintThrottled('Hello, world');
    }), equals(<String>['Hello, world']));

    expect(captureOutput(() {
      debugPrintThrottled('Hello, world', wrapWidth: 10);
    }), equals(<String>['Hello,', 'world']));
  });

  test('debugPrint throttling', () {
    FakeAsync().run((FakeAsync async) {
      List<String> log = captureOutput(() {
        debugPrintThrottled('A' * (22 * 1024) + '\nB');
      });
      expect(log.length, 1);
      async.elapse(const Duration(seconds: 2));
      expect(log.length, 2);

      log = captureOutput(() {
        debugPrintThrottled('C' * (22 * 1024));
        debugPrintThrottled('D');
      });

      expect(log.length, 1);
      async.elapse(const Duration(seconds: 2));
      expect(log.length, 2);
    });
  });

  test('debugPrint can print null', () {
    expect(
      captureOutput(() {
        debugPrintThrottled(null);
      }),
      equals(<String>['null']),
    );

    expect(
      captureOutput(() {
        debugPrintThrottled(null, wrapWidth: 80);
      }),
      equals(<String>['null']),
    );
  });
}