blob: 30758c555f5b07ae141ef26d626bd58d8c51368c [file] [log] [blame]
// Copyright 2013 The Flutter 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 'dart:html' as html;
import 'package:flutter_test/flutter_test.dart';
import 'package:regular_integration_tests/treeshaking_main.dart' as app;
import 'package:flutter/material.dart';
import 'package:e2e/e2e.dart';
void main() {
E2EWidgetsFlutterBinding.ensureInitialized() as E2EWidgetsFlutterBinding;
testWidgets('debug+Fill+Properties for widgets is tree shaken',
(WidgetTester tester) async {
// About 11 instances are used by DiagnosticsNode and diagnostics
// for flutter framework itself. Widgets have > 100. So we check for 20 to
// so this test fails when tree-shaking is broken.
await testOccurenceCountBelow(tester, '${debugPrefix}FillProperties', 20);
// Used to prevent compiler optimization that will generate const string.
// Preventing counting test strings.
String get debugPrefix => <String>['d','e','b','u','g'].join('');
Future<void> testOccurenceCountBelow(WidgetTester tester, String methodName, int count) async {
await tester.pumpAndSettle();
// Make sure app loaded.
final Finder finder = find.byKey(const Key('mainapp'));
expect(finder, findsOneWidget);
await _loadBundleAndCheck(methodName, count);
String fileContents;
Future<void> _loadBundleAndCheck(String methodName, int count) async {
fileContents ??= await html.HttpRequest.getString('main.dart.js');
expect(fileContents, contains('RenderObjectToWidgetElement'));
expect(occurrenceCount(fileContents, methodName), lessThan(count));
int occurrenceCount(String contents, String word) {
int count = 0;
final int wordLength = word.length;
int pos = contents.indexOf(word);
final int contentLength = contents.length;
while (pos != -1) {
pos += wordLength;
if (pos >= contentLength || count > 100) {
pos = contents.indexOf(word, pos);
return count;