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// Copyright 2014 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:async';
import 'dart:convert';
import 'dart:io';
import 'package:flutter_driver/flutter_driver.dart';
import 'package:path/path.dart' as p;
import 'package:test/test.dart' hide TypeMatcher, isInstanceOf;
void main() {
group('semantics performance test', () {
FlutterDriver driver;
setUpAll(() async {
driver = await FlutterDriver.connect(printCommunication: true);
});
tearDownAll(() async {
if (driver != null)
driver.close();
});
test('inital tree creation', () async {
// Let app become fully idle.
await Future<void>.delayed(const Duration(seconds: 2));
await driver.forceGC();
final Timeline timeline = await driver.traceAction(() async {
expect(await driver.setSemantics(true), isTrue);
});
final Iterable<TimelineEvent> semanticsEvents = timeline.events.where((TimelineEvent event) => event.name == 'Semantics');
if (semanticsEvents.length != 2)
fail('Expected exactly two semantics events, got ${semanticsEvents.length}');
final Duration semanticsTreeCreation = Duration(microseconds: semanticsEvents.last.timestampMicros - semanticsEvents.first.timestampMicros);
final String jsonEncoded = json.encode(<String, dynamic>{'initialSemanticsTreeCreation': semanticsTreeCreation.inMilliseconds});
File(p.join(testOutputsDirectory, 'complex_layout_semantics_perf.json')).writeAsStringSync(jsonEncoded);
});
});
}