Use native async/await support in pub.

sdk/lib/_internal/pub_generated/test/cache/list_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.
-
-library pub_cache_test;
-
-import 'package:path/path.dart' as path;
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-
-  hostedDir(package) {
-    return path.join(
-        sandboxDir,
-        cachePath,
-        "hosted",
-        "pub.dartlang.org",
-        package);
-  }
-
-  integration('running pub cache list when there is no cache', () {
-    schedulePub(args: ['cache', 'list'], output: '{"packages":{}}');
-  });
-
-  integration('running pub cache list on empty cache', () {
-    // Set up a cache.
-    d.dir(
-        cachePath,
-        [d.dir('hosted', [d.dir('pub.dartlang.org', [])])]).create();
-
-    schedulePub(args: ['cache', 'list'], outputJson: {
-      "packages": {}
-    });
-  });
-
-  integration('running pub cache list', () {
-    // Set up a cache.
-    d.dir(
-        cachePath,
-        [
-            d.dir(
-                'hosted',
-                [
-                    d.dir(
-                        'pub.dartlang.org',
-                        [
-                            d.dir("foo-1.2.3", [d.libPubspec("foo", "1.2.3"), d.libDir("foo")]),
-                            d.dir(
-                                "bar-2.0.0",
-                                [d.libPubspec("bar", "2.0.0"), d.libDir("bar")])])])]).create();
-
-    schedulePub(args: ['cache', 'list'], outputJson: {
-      "packages": {
-        "bar": {
-          "2.0.0": {
-            "location": hostedDir('bar-2.0.0')
-          }
-        },
-        "foo": {
-          "1.2.3": {
-            "location": hostedDir('foo-1.2.3')
-          }
-        }
-      }
-    });
-  });
-
-  integration('includes packages containing deps with bad sources', () {
-    // Set up a cache.
-    d.dir(
-        cachePath,
-        [
-            d.dir(
-                'hosted',
-                [
-                    d.dir(
-                        'pub.dartlang.org',
-                        [d.dir("foo-1.2.3", [d.libPubspec("foo", "1.2.3", deps: {
-              "bar": {
-                "bad": "bar"
-              }
-            }), d.libDir("foo")])])])]).create();
-
-    schedulePub(args: ['cache', 'list'], outputJson: {
-      "packages": {
-        "foo": {
-          "1.2.3": {
-            "location": hostedDir('foo-1.2.3')
-          }
-        }
-      }
-    });
-  });
-}