// 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:convert'; import 'dart:io'; import 'package:flutter_test/flutter_test.dart'; import 'package:path/path.dart' as path; final String bat = Platform.isWindows ? '.bat' : ''; final String _flutterBin = path.join(Directory.current.parent.parent.path, 'bin', 'flutter$bat'); const String _integrationResultsPrefix = 'IntegrationTestWidgetsFlutterBinding test results:'; const String _failureExcerpt = r'Expected: <false>\n Actual: <true>'; Future<void> main() async { group('Integration binding result', () { test('when multiple tests pass', () async { final Map<String, dynamic>? results = await _runTest(path.join('test', 'data', 'pass_test_script.dart')); expect( results, equals(<String, dynamic>{ 'passing test 1': 'success', 'passing test 2': 'success', })); }); test('when multiple tests fail', () async { final Map<String, dynamic>? results = await _runTest(path.join('test', 'data', 'fail_test_script.dart')); expect(results, hasLength(2)); expect(results, containsPair('failing test 1', contains(_failureExcerpt))); expect(results, containsPair('failing test 2', contains(_failureExcerpt))); }); test('when one test passes, then another fails', () async { final Map<String, dynamic>? results = await _runTest(path.join('test', 'data', 'pass_then_fail_test_script.dart')); expect(results, hasLength(2)); expect(results, containsPair('passing test', equals('success'))); expect(results, containsPair('failing test', contains(_failureExcerpt))); }); test('when one test fails, then another passes', () async { final Map<String, dynamic>? results = await _runTest(path.join('test', 'data', 'fail_then_pass_test_script.dart')); expect(results, hasLength(2)); expect(results, containsPair('failing test', contains(_failureExcerpt))); expect(results, containsPair('passing test', equals('success'))); }); }); } /// Runs a test script and returns the [IntegrationTestWidgetsFlutterBinding.result]. /// /// [scriptPath] is relative to the package root. Future<Map<String, dynamic>?> _runTest(String scriptPath) async { final Process process = await Process.start(_flutterBin, <String>['test', '--machine', scriptPath]); /// In the test [tearDownAll] block, the test results are encoded into JSON and /// are printed with the [_integrationResultsPrefix] prefix. /// /// See the following for the test event spec which we parse the printed lines /// out of: https://github.com/dart-lang/test/blob/master/pkgs/test/doc/json_reporter.md final String testResults = (await process.stdout .transform(utf8.decoder) .expand((String text) => text.split('\n')) .map<dynamic>((String line) { try { return jsonDecode(line); } on FormatException { // Only interested in test events which are JSON. } }) .expand<Map<String, dynamic>>((dynamic json) { if (json is List<dynamic>) { return json.cast(); } return <Map<String, dynamic>>[ if (json != null) json as Map<String, dynamic>, ]; }) .where((Map<String, dynamic> testEvent) => testEvent['type'] == 'print') .map((Map<String, dynamic> printEvent) => printEvent['message'] as String) .firstWhere((String message) => message.startsWith(_integrationResultsPrefix))) .replaceAll(_integrationResultsPrefix, ''); return jsonDecode(testResults) as Map<String, dynamic>?; }