// 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 'package:flutter/material.dart'; import 'package:flutter_test/flutter_test.dart'; import 'package:stocks/main.dart' as stocks; import 'package:stocks/stock_data.dart' as stock_data; import '../common.dart'; const Duration kBenchmarkTime = Duration(seconds: 15); Future<void> main() async { assert(false, "Don't run benchmarks in checked mode! Use 'flutter run --release'."); stock_data.StockData.actuallyFetchData = false; // We control the framePolicy below to prevent us from scheduling frames in // the engine, so that the engine does not interfere with our timings. final LiveTestWidgetsFlutterBinding binding = TestWidgetsFlutterBinding.ensureInitialized() as LiveTestWidgetsFlutterBinding; final Stopwatch watch = Stopwatch(); int iterations = 0; await benchmarkWidgets((WidgetTester tester) async { stocks.main(); await tester.pump(); // Start startup animation await tester.pump(const Duration(seconds: 1)); // Complete startup animation await tester.tapAt(const Offset(20.0, 40.0)); // Open drawer await tester.pump(); // Start drawer animation await tester.pump(const Duration(seconds: 1)); // Complete drawer animation final Element appState = tester.element(find.byType(stocks.StocksApp)); binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.benchmark; watch.start(); while (watch.elapsed < kBenchmarkTime) { appState.markNeedsBuild(); // We don't use tester.pump() because we're trying to drive it in an // artificially high load to find out how much CPU each frame takes. // This differs from normal benchmarks which might look at how many // frames are missed, etc. // We use Timer.run to ensure there's a microtask flush in between // the two calls below. await tester.pumpBenchmark(Duration(milliseconds: iterations * 16)); iterations += 1; } watch.stop(); }); final BenchmarkResultPrinter printer = BenchmarkResultPrinter(); printer.addResult( description: 'Stock build', value: watch.elapsedMicroseconds / iterations, unit: 'µs per iteration', name: 'stock_build_iteration', ); printer.printToStdout(); }