[flutter_tools] Make setting of CWD consistent for flutter test (#74622)

dev/automated_tests/flutter_test/working_directory_expectation.txt

+[0-9]+:[0-9]+ [+]1: All tests passed!

dev/automated_tests/flutter_test/working_directory_test.dart

+// 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:io';
+import 'package:test/test.dart' hide TypeMatcher, isInstanceOf;
+
+void main() {
+  test('working directory is the root of this package', () {
+    expect(Directory.current.path, endsWith('automated_tests'));
+   });
+}

dev/tools/vitool/test/vitool_test.dart

@@ -10,8 +10,6 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:vitool/vitool.dart';
 import 'package:path/path.dart' as path;
 
-const String kPackagePath = '..';
-
 void main() {
 
   test('parsePixels', () {
@@ -694,5 +692,5 @@ class PathAnimationMatcher extends Matcher {
 }
 
 String testAsset(String name) {
-  return path.join(kPackagePath, 'test_assets', name);
+  return path.join('test_assets', name);
 }

packages/flutter_localizations/test/cupertino/translations_test.dart

@@ -13,7 +13,7 @@ import 'package:flutter_test/flutter_test.dart';
 
 import '../test_utils.dart';
 
-final String rootDirectoryPath = Directory.current.parent.path;
+final String rootDirectoryPath = Directory.current.path;
 
 void main() {
   for (final String language in kCupertinoSupportedLanguages) {

packages/flutter_localizations/test/material/translations_test.dart

@@ -13,7 +13,7 @@ import 'package:flutter_test/flutter_test.dart';
 
 import '../test_utils.dart';
 
-final String rootDirectoryPath = Directory.current.parent.path;
+final String rootDirectoryPath = Directory.current.path;
 
 void main() {
   for (final String language in kMaterialSupportedLanguages) {

packages/flutter_tools/bin/fuchsia_tester.dart

@@ -140,7 +140,6 @@ Future<void> run(List<String> args) async {
     exitCode = await const FlutterTestRunner().runTests(
       const TestWrapper(),
       tests.keys.toList(),
-      workDir: testDirectory,
       watcher: collector,
       ipv6: false,
       enableObservatory: collector != null,

packages/flutter_tools/lib/src/commands/test.dart

@@ -219,18 +219,17 @@ class TestCommand extends FlutterCommand {
       );
     }
 
-    Directory workDir;
     if (files.isEmpty) {
       // We don't scan the entire package, only the test/ subdirectory, so that
       // files with names like like "hit_test.dart" don't get run.
-      workDir = globals.fs.directory('test');
-      if (!workDir.existsSync()) {
-        throwToolExit('Test directory "${workDir.path}" not found.');
+      final Directory testDir = globals.fs.directory('test');
+      if (!testDir.existsSync()) {
+        throwToolExit('Test directory "${testDir.path}" not found.');
       }
-      files = _findTests(workDir).toList();
+      files = _findTests(testDir).toList();
       if (files.isEmpty) {
         throwToolExit(
-            'Test directory "${workDir.path}" does not appear to contain any test files.\n'
+            'Test directory "${testDir.path}" does not appear to contain any test files.\n'
             'Test files must be in that directory and end with the pattern "_test.dart".'
         );
       }
@@ -269,7 +268,6 @@ class TestCommand extends FlutterCommand {
     final int result = await testRunner.runTests(
       testWrapper,
       files,
-      workDir: workDir,
       names: names,
       plainNames: plainNames,
       tags: tags,

packages/flutter_tools/lib/src/test/runner.dart

@@ -27,7 +27,6 @@ abstract class FlutterTestRunner {
   Future<int> runTests(
     TestWrapper testWrapper,
     List<String> testFiles, {
-    Directory workDir,
     List<String> names = const <String>[],
     List<String> plainNames = const <String>[],
     String tags,
@@ -64,7 +63,6 @@ class _FlutterTestRunnerImpl implements FlutterTestRunner {
   Future<int> runTests(
     TestWrapper testWrapper,
     List<String> testFiles, {
-    Directory workDir,
     List<String> names = const <String>[],
     List<String> plainNames = const <String>[],
     String tags,
@@ -206,14 +204,7 @@ class _FlutterTestRunnerImpl implements FlutterTestRunner {
       additionalArguments: additionalArguments,
     );
 
-    // Call package:test's main method in the appropriate directory.
-    final Directory saved = globals.fs.currentDirectory;
     try {
-      if (workDir != null) {
-        globals.printTrace('switching to directory $workDir to run tests');
-        globals.fs.currentDirectory = workDir;
-      }
-
       globals.printTrace('running test package with arguments: $testArgs');
       await testWrapper.main(testArgs);
 
@@ -222,7 +213,6 @@ class _FlutterTestRunnerImpl implements FlutterTestRunner {
 
       return exitCode;
     } finally {
-      globals.fs.currentDirectory = saved.path;
       await platform.close();
     }
   }

packages/flutter_tools/test/integration.shard/test_test.dart

@@ -42,6 +42,10 @@ void main() {
     return _testFile('trivial_widget', automatedTestsDirectory, flutterTestDirectory, exitCode: isZero);
   });
 
+  testWithoutContext('flutter test set the working directory correctly', () async {
+    return _testFile('working_directory', automatedTestsDirectory, flutterTestDirectory, exitCode: isZero);
+  });
+
   testWithoutContext('flutter test should report nice errors for exceptions thrown within testWidgets()', () async {
     return _testFile('exception_handling', automatedTestsDirectory, flutterTestDirectory);
   });

packages/integration_test/test/binding_fail_test.dart

@@ -10,7 +10,7 @@ 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.parent.path, 'bin', 'flutter$bat');
+final String _flutterBin = path.join(Directory.current.parent.parent.path, 'bin', 'flutter$bat');
 const String _integrationResultsPrefix =
     'IntegrationTestWidgetsFlutterBinding test results:';
 const String _failureExcerpt = r'Expected: <false>\n  Actual: <true>';