Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/dart2js/supports_configuration_with_build_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 'dart:convert';
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-  integration("compiles dart.js and interop.js next to entrypoints when "
-              "dartjs is explicitly configured", () {
-    // Dart2js can take a long time to compile dart code, so we increase the
-    // timeout to cope with that.
-    currentSchedule.timeout *= 3;
-
-    serve([
-      d.dir('api', [
-        d.dir('packages', [
-          d.file('browser', JSON.encode({
-            'versions': [packageVersionApiMap(packageMap('browser', '1.0.0'))]
-          })),
-          d.dir('browser', [
-            d.dir('versions', [
-              d.file('1.0.0', JSON.encode(
-                  packageVersionApiMap(
-                      packageMap('browser', '1.0.0'),
-                      full: true)))
-            ])
-          ])
-        ])
-      ]),
-      d.dir('packages', [
-        d.dir('browser', [
-          d.dir('versions', [
-            d.tar('1.0.0.tar.gz', [
-              d.file('pubspec.yaml', yaml(packageMap("browser", "1.0.0"))),
-              d.dir('lib', [
-                d.file('dart.js', 'contents of dart.js'),
-                d.file('interop.js', 'contents of interop.js')
-              ])
-            ])
-          ])
-        ])
-      ])
-    ]);
-
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "dependencies": {
-          "browser": "1.0.0"
-        },
-        "transformers": [{
-          "\$dart2js": {
-            "minify": true
-          }
-        }]
-      }),
-      d.dir('web', [
-        d.file('file.dart', 'void main() => print("hello");'),
-      ])
-    ]).create();
-
-    pubGet();
-
-    schedulePub(args: ["build"],
-        output: new RegExp(r'Built 3 files to "build".'),
-        exitCode: 0);
-
-    d.dir(appPath, [
-      d.dir('build', [
-        d.dir('web', [
-          d.matcherFile('file.dart.js', isMinifiedDart2JSOutput),
-          d.dir('packages', [
-            d.dir('browser', [
-              d.file('dart.js', 'contents of dart.js'),
-              d.file('interop.js', 'contents of interop.js')
-            ])
-          ]),
-        ])
-      ])
-    ]).validate();
-  });
-}