Use native async/await support in pub.

sdk/lib/_internal/pub_generated/test/pub_get_and_upgrade_test.dart

-// Copyright (c) 2012, 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_tests;
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../lib/src/exit_codes.dart' as exit_codes;
-import 'descriptor.dart' as d;
-import 'test_pub.dart';
-
-main() {
-  initConfig();
-
-  forBothPubGetAndUpgrade((command) {
-    group('requires', () {
-      integration('a pubspec', () {
-        d.dir(appPath, []).create();
-
-        pubCommand(
-            command,
-            error: new RegExp(
-                r'Could not find a file named "pubspec.yaml" ' r'in "[^\n]*"\.'));
-      });
-
-      integration('a pubspec with a "name" key', () {
-        d.dir(appPath, [d.pubspec({
-            "dependencies": {
-              "foo": null
-            }
-          })]).create();
-
-        pubCommand(
-            command,
-            error: contains('Missing the required "name" field.'),
-            exitCode: exit_codes.DATA);
-      });
-    });
-
-    integration('adds itself to the packages', () {
-      // The symlink should use the name in the pubspec, not the name of the
-      // directory.
-      d.dir(appPath, [d.pubspec({
-          "name": "myapp_name"
-        }), d.libDir('myapp_name')]).create();
-
-      pubCommand(command);
-
-      d.dir(
-          packagesPath,
-          [
-              d.dir(
-                  "myapp_name",
-                  [d.file('myapp_name.dart', 'main() => "myapp_name";')])]).validate();
-    });
-
-    integration(
-        'does not adds itself to the packages if it has no "lib" ' 'directory',
-        () {
-      // The symlink should use the name in the pubspec, not the name of the
-      // directory.
-      d.dir(appPath, [d.pubspec({
-          "name": "myapp_name"
-        }),]).create();
-
-      pubCommand(command);
-
-      d.dir(packagesPath, [d.nothing("myapp_name")]).validate();
-    });
-
-    integration(
-        'does not add a package if it does not have a "lib" ' 'directory',
-        () {
-      // Using a path source, but this should be true of all sources.
-      d.dir('foo', [d.libPubspec('foo', '0.0.0-not.used')]).create();
-
-      d.dir(appPath, [d.appPubspec({
-          "foo": {
-            "path": "../foo"
-          }
-        })]).create();
-
-      pubCommand(command);
-
-      d.packagesDir({
-        "foo": null
-      }).validate();
-    });
-
-    integration('reports a solver failure', () {
-      // myapp depends on foo and bar which both depend on baz with mismatched
-      // descriptions.
-      d.dir('deps', [d.dir('foo', [d.pubspec({
-            "name": "foo",
-            "dependencies": {
-              "baz": {
-                "path": "../baz1"
-              }
-            }
-          })]), d.dir('bar', [d.pubspec({
-            "name": "bar",
-            "dependencies": {
-              "baz": {
-                "path": "../baz2"
-              }
-            }
-          })]),
-              d.dir('baz1', [d.libPubspec('baz', '0.0.0')]),
-              d.dir('baz2', [d.libPubspec('baz', '0.0.0')])]).create();
-
-      d.dir(appPath, [d.appPubspec({
-          "foo": {
-            "path": "../deps/foo"
-          },
-          "bar": {
-            "path": "../deps/bar"
-          }
-        })]).create();
-
-      pubCommand(
-          command,
-          error: new RegExp("^Incompatible dependencies on baz:\n"));
-    });
-
-    integration('does not allow a dependency on itself', () {
-      d.dir(appPath, [d.appPubspec({
-          "myapp": {
-            "path": "."
-          }
-        })]).create();
-
-      pubCommand(
-          command,
-          error: contains('A package may not list itself as a dependency.'),
-          exitCode: exit_codes.DATA);
-    });
-
-    integration('does not allow a dev dependency on itself', () {
-      d.dir(appPath, [d.pubspec({
-          "name": "myapp",
-          "dev_dependencies": {
-            "myapp": {
-              "path": "."
-            }
-          }
-        })]).create();
-
-      pubCommand(
-          command,
-          error: contains('A package may not list itself as a dependency.'),
-          exitCode: exit_codes.DATA);
-    });
-  });
-}