Revert "Revert "Use native async/await support in pub.""

sdk/lib/_internal/pub_generated/test/validator/license_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'package:path/path.dart' as path;
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../../lib/src/entrypoint.dart';
-import '../../lib/src/io.dart';
-import '../../lib/src/validator.dart';
-import '../../lib/src/validator/license.dart';
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-import 'utils.dart';
-
-Validator license(Entrypoint entrypoint) => new LicenseValidator(entrypoint);
-
-main() {
-  initConfig();
-
-  group('should consider a package valid if it', () {
-    setUp(d.validPackage.create);
-
-    integration('looks normal', () => expectNoValidationError(license));
-
-    integration('has a COPYING file', () {
-      schedule(() => deleteEntry(path.join(sandboxDir, appPath, 'LICENSE')));
-      d.file(path.join(appPath, 'COPYING'), '').create();
-      expectNoValidationError(license);
-    });
-
-    integration('has a prefixed LICENSE file', () {
-      schedule(() => deleteEntry(path.join(sandboxDir, appPath, 'LICENSE')));
-      d.file(path.join(appPath, 'MIT_LICENSE'), '').create();
-      expectNoValidationError(license);
-    });
-
-    integration('has a suffixed LICENSE file', () {
-      schedule(() => deleteEntry(path.join(sandboxDir, appPath, 'LICENSE')));
-      d.file(path.join(appPath, 'LICENSE.md'), '').create();
-      expectNoValidationError(license);
-    });
-  });
-
-  integration(
-      'should consider a package invalid if it has no LICENSE file',
-      () {
-    d.validPackage.create();
-    schedule(() => deleteEntry(path.join(sandboxDir, appPath, 'LICENSE')));
-    expectValidationError(license);
-  });
-}