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

sdk/lib/_internal/pub_generated/test/get/path/relative_path_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 d.file.
-
-import 'package:path/path.dart' as path;
-import 'package:scheduled_test/scheduled_test.dart';
-import 'package:unittest/unittest.dart';
-
-import '../../../lib/src/lock_file.dart';
-import '../../../lib/src/source_registry.dart';
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration("can use relative path", () {
-    d.dir("foo", [d.libDir("foo"), d.libPubspec("foo", "0.0.1")]).create();
-
-    d.dir(appPath, [d.appPubspec({
-        "foo": {
-          "path": "../foo"
-        }
-      })]).create();
-
-    pubGet();
-
-    d.dir(
-        packagesPath,
-        [d.dir("foo", [d.file("foo.dart", 'main() => "foo";')])]).validate();
-  });
-
-  integration("path is relative to containing d.pubspec", () {
-    d.dir(
-        "relative",
-        [d.dir("foo", [d.libDir("foo"), d.libPubspec("foo", "0.0.1", deps: {
-          "bar": {
-            "path": "../bar"
-          }
-        })]),
-            d.dir("bar", [d.libDir("bar"), d.libPubspec("bar", "0.0.1")])]).create();
-
-    d.dir(appPath, [d.appPubspec({
-        "foo": {
-          "path": "../relative/foo"
-        }
-      })]).create();
-
-    pubGet();
-
-    d.dir(
-        packagesPath,
-        [
-            d.dir("foo", [d.file("foo.dart", 'main() => "foo";')]),
-            d.dir("bar", [d.file("bar.dart", 'main() => "bar";')])]).validate();
-  });
-
-  integration("relative path preserved in the lockfile", () {
-    d.dir("foo", [d.libDir("foo"), d.libPubspec("foo", "0.0.1")]).create();
-
-    d.dir(appPath, [d.appPubspec({
-        "foo": {
-          "path": "../foo"
-        }
-      })]).create();
-
-    pubGet();
-
-    schedule(() {
-      var lockfilePath = path.join(sandboxDir, appPath, "pubspec.lock");
-      var lockfile = new LockFile.load(lockfilePath, new SourceRegistry());
-      var description = lockfile.packages["foo"].description;
-
-      expect(path.isRelative(description["path"]), isTrue);
-    });
-  });
-}