| import 'dart:async'; |
| import 'dart:io'; |
| import 'dart:convert'; |
| |
| import 'package:flutter_test/flutter_test.dart'; |
| |
| // Assumes that the flutter command is in `$PATH`. |
| const String _flutterBin = 'flutter'; |
| const String _e2eResultsPrefix = 'E2EWidgetsFlutterBinding test results:'; |
| |
| void main() async { |
| group('E2E binding result', () { |
| test('when multiple tests pass', () async { |
| final Map<String, dynamic> results = |
| await _runTest('test/data/pass_test_script.dart'); |
| |
| expect( |
| results, |
| equals({ |
| 'passing test 1': 'success', |
| 'passing test 2': 'success', |
| })); |
| }); |
| |
| test('when multiple tests fail', () async { |
| final Map<String, dynamic> results = |
| await _runTest('test/data/fail_test_script.dart'); |
| |
| expect( |
| results, |
| equals({ |
| 'failing test 1': 'failed', |
| 'failing test 2': 'failed', |
| })); |
| }); |
| |
| test('when one test passes, then another fails', () async { |
| final Map<String, dynamic> results = |
| await _runTest('test/data/pass_then_fail_test_script.dart'); |
| |
| expect( |
| results, |
| equals({ |
| 'passing test': 'success', |
| 'failing test': 'failed', |
| })); |
| }); |
| }); |
| } |
| |
| /// Runs a test script and returns the [E2EWidgetsFlutterBinding.result]. |
| /// |
| /// [scriptPath] is relative to the package root. |
| Future<Map<String, dynamic>> _runTest(String scriptPath) async { |
| final Process process = |
| await Process.start(_flutterBin, ['test', '--machine', scriptPath]); |
| |
| // In the test [tearDownAll] block, the test results are encoded into JSON and |
| // are printed with the [_e2eResultsPrefix] 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((String line) { |
| try { |
| return jsonDecode(line); |
| } on FormatException { |
| // Only interested in test events which are JSON. |
| } |
| }) |
| .where((dynamic testEvent) => |
| testEvent != null && testEvent['type'] == 'print') |
| .map((dynamic printEvent) => printEvent['message'] as String) |
| .firstWhere( |
| (String message) => message.startsWith(_e2eResultsPrefix))) |
| .replaceAll(_e2eResultsPrefix, ''); |
| |
| return jsonDecode(testResults); |
| } |