[flutter_test] handle breaking change to test main (#67425)

* [flutter_test] handle breaking change to test main . Fixes #67382

dev/integration_tests/flutter_gallery/test/flutter_test_config.dart

@@ -2,4 +2,4 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-export 'package:flutter_goldens/flutter_goldens.dart' show main;
+export 'package:flutter_goldens/flutter_goldens.dart' show testExecutable;

packages/flutter/test/flutter_test_config.dart

@@ -2,4 +2,4 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-export 'package:flutter_goldens/flutter_goldens.dart' show main;
+export 'package:flutter_goldens/flutter_goldens.dart' show testExecutable;

packages/flutter_goldens/lib/flutter_goldens.dart

@@ -27,7 +27,7 @@ const String _kFlutterRootKey = 'FLUTTER_ROOT';
 /// [goldenFileComparator] to an instance of [FlutterGoldenFileComparator] that
 /// works for the current test. _Which_ FlutterGoldenFileComparator is
 /// instantiated is based on the current testing environment.
-Future<void> main(FutureOr<void> testMain()) async {
+Future<void> testExecutable(FutureOr<void> testMain()) async {
   const Platform platform = LocalPlatform();
   if (FlutterPostSubmitFileComparator.isAvailableForEnvironment(platform)) {
     goldenFileComparator = await FlutterPostSubmitFileComparator.fromDefaultComparator(platform);

packages/flutter_test/test/custom_exception_reporter/flutter_test_config.dart

@@ -7,7 +7,7 @@ import 'dart:async';
 import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-Future<void> main(FutureOr<void> testMain()) async {
+Future<void> testExecutable(FutureOr<void> testMain()) async {
   reportTestException = (FlutterErrorDetails details, String testDescription) {
     expect(details.exception, isA<StateError>());
     expect((details.exception as StateError).message, 'foo');

packages/flutter_test/test/test_config/flutter_test_config.dart

@@ -4,7 +4,7 @@
 
 import 'dart:async';
 
-Future<void> main(FutureOr<void> testMain()) async {
+Future<void> testExecutable(FutureOr<void> testMain()) async {
   await runZoned<dynamic>(testMain, zoneValues: <Type, String>{
     String: '/test_config',
   });

packages/flutter_test/test/test_config/nested_config/flutter_test_config.dart

@@ -4,7 +4,7 @@
 
 import 'dart:async';
 
-Future<void> main(FutureOr<void> testMain()) async {
+Future<void> testExecutable(FutureOr<void> testMain()) async {
   await runZoned<dynamic>(testMain, zoneValues: <Type, dynamic>{
     String: '/test_config/nested_config',
     int: 123,

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

@@ -197,7 +197,7 @@ void main() {
 ''');
   if (testConfigFile != null) {
     buffer.write('''
-    return () => test_config.main(test.main);
+    return () => test_config.testExecutable(test.main);
 ''');
   } else {
     buffer.write('''

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

@@ -956,7 +956,7 @@ void main() async {
   LocalFileComparator comparator = LocalFileComparator(Uri.parse('$testUri'));
   goldenFileComparator = comparator;
 
-  ${testConfigFile != null ? 'test_config.main(() async {' : ''}
+  ${testConfigFile != null ? 'test_config.testExecutable(() async {' : ''}
   final commands = stdin
     .transform<String>(utf8.decoder)
     .transform<String>(const LineSplitter())