Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/transformer/configuration/with_configuration_only_instantiates_configurable_transformers_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 file.
-
-library pub_tests;
-
-import 'dart:convert';
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-import '../../serve/utils.dart';
-
-final transformer = """
-import 'dart:async';
-import 'dart:convert';
-
-import 'package:barback/barback.dart';
-
-class ConfigTransformer extends Transformer {
-  final BarbackSettings settings;
-
-  ConfigTransformer.asPlugin(this.settings);
-
-  String get allowedExtensions => '.txt';
-
-  Future apply(Transform transform) {
-    return transform.primaryInput.readAsString().then((contents) {
-      var id = transform.primaryInput.id.changeExtension(".json");
-      transform.addOutput(
-          new Asset.fromString(id, JSON.encode(settings.configuration)));
-    });
-  }
-}
-
-class RewriteTransformer extends Transformer {
-  RewriteTransformer.asPlugin();
-
-  String get allowedExtensions => '.txt';
-
-  Future apply(Transform transform) {
-    return transform.primaryInput.readAsString().then((contents) {
-      var id = transform.primaryInput.id.changeExtension(".out");
-      transform.addOutput(new Asset.fromString(id, "\$contents.out"));
-    });
-  }
-}
-""";
-
-main() {
-  initConfig();
-  withBarbackVersions("any", () {
-     integration("with configuration, only instantiates configurable "
-         "transformers", () {
-       var configuration = {"param": ["list", "of", "values"]};
-
-       d.dir(appPath, [
-         d.pubspec({
-           "name": "myapp",
-           "transformers": [{"myapp/src/transformer": configuration}]
-         }),
-         d.dir("lib", [d.dir("src", [
-           d.file("transformer.dart", transformer)
-         ])]),
-         d.dir("web", [
-           d.file("foo.txt", "foo")
-         ])
-       ]).create();
-
-       createLockFile('myapp', pkg: ['barback']);
-
-       var server = pubServe();
-       requestShouldSucceed("foo.json", JSON.encode(configuration));
-       requestShould404("foo.out");
-       endPubServe();
-     });
-  });
-}