[flutter_tools] revert change to SETLOCAL ENABLEDELAYEDEXPANSION (#86000)

bin/dart.bat

@@ -11,6 +11,8 @@ REM work across all platforms!
 REM
 REM --------------------------------------------------------------------------
 
+SETLOCAL ENABLEDELAYEDEXPANSION
+
 FOR %%i IN ("%~dp0..") DO SET FLUTTER_ROOT=%%~fi
 
 REM Include shared scripts in shared.bat

bin/flutter.bat

@@ -11,6 +11,8 @@ REM work across all platforms!
 REM
 REM --------------------------------------------------------------------------
 
+SETLOCAL ENABLEDELAYEDEXPANSION
+
 FOR %%i IN ("%~dp0..") DO SET FLUTTER_ROOT=%%~fi
 
 REM If available, add location of bundled mingit to PATH

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

@@ -0,0 +1,62 @@
+// 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.
+
+// @dart = 2.8
+
+import 'package:file/file.dart';
+import 'package:flutter_tools/src/base/io.dart';
+
+import '../src/common.dart';
+import 'test_utils.dart';
+
+void main() {
+  final String dartBin = fileSystem.path.join(getFlutterRoot(), 'bin', 'dart');
+  Directory tempDir;
+
+  setUp(() {
+    tempDir = createResolvedTempDirectorySync('exit_code_test.');
+  });
+
+  tearDown(() {
+    tryToDelete(tempDir);
+  });
+
+  testWithoutContext('dart.sh/bat can return a zero exit code', () async {
+    tempDir.childFile('main.dart')
+      .writeAsStringSync('''
+import 'dart:io';
+void main() {
+  exit(0);
+}
+''');
+
+    final ProcessResult result = await processManager.run(<String>[
+      dartBin,
+      fileSystem.path.join(tempDir.path, 'main.dart'),
+    ]);
+
+    print(result.stdout);
+    print(result.stderr);
+    expect(result.exitCode, 0);
+  });
+
+  testWithoutContext('dart.sh/bat can return a non-zero exit code', () async {
+    tempDir.childFile('main.dart')
+      .writeAsStringSync('''
+import 'dart:io';
+void main() {
+  exit(1);
+}
+''');
+
+    final ProcessResult result = await processManager.run(<String>[
+      dartBin,
+      fileSystem.path.join(tempDir.path, 'main.dart'),
+    ]);
+
+    print(result.stdout);
+    print(result.stderr);
+    expect(result.exitCode, 1);
+  });
+}

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

@@ -33,7 +33,7 @@ import 'package:pedantic/pedantic.dart';
 import 'package:process/process.dart';
 
 import '../src/common.dart';
-import 'test_utils.dart' show fileSystem;
+import 'test_utils.dart' show fileSystem, platform;
 
 const ProcessManager processManager = LocalProcessManager();
 final String flutterRoot = getFlutterRoot();
@@ -315,7 +315,7 @@ void main() {
     } finally {
       tryToDelete(fileSystem.directory(tempDirectory));
     }
-  });
+  }, skip: platform.isWindows);
 
   testWithoutContext('flutter run handle SIGUSR1/2', () async {
     final String tempDirectory = fileSystem.systemTempDirectory.createTempSync('flutter_overall_experience_test.').resolveSymbolicLinksSync();
@@ -591,5 +591,5 @@ void main() {
       '',
       'Application finished.',
     ]);
-  });
+  }, skip: Platform.isWindows); // TODO(jonahwilliams): Re-enable when this test is reliable on device lab, https://github.com/flutter/flutter/issues/81556
 }

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

@@ -17,5 +17,5 @@ void main() {
       '"^(?!Golden).+"',
     ]);
     expect(result.stdout, contains('args: ["(?!Golden).+"]'));
-  }, skip: !platform.isWindows);
+  }, skip: 'Reverted in https://github.com/flutter/flutter/pull/86000');
 }