Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/build/includes_dart_files_from_dependencies_in_debug_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 'package:scheduled_test/scheduled_test.dart';
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-
-  integration("includes .dart files from dependencies in debug mode", () {
-    // Dart2js can take a long time to compile dart code, so we increase the
-    // timeout to cope with that.
-    currentSchedule.timeout *= 3;
-
-    d.dir("foo", [
-      d.libPubspec("foo", "0.0.1"),
-      d.dir("lib", [
-        d.file('foo.dart', 'foo() => print("hello");'),
-        d.dir("sub", [
-          d.file('bar.dart', 'bar() => print("hello");'),
-        ])
-      ])
-    ]).create();
-
-    d.dir(appPath, [
-      d.appPubspec({
-        "foo": {"path": "../foo"}
-      }),
-      d.dir("example", [
-        d.file("main.dart", 'myapp() => print("not entrypoint");'),
-        d.dir("sub", [
-          d.file("main.dart", 'myapp() => print("not entrypoint");')
-        ])
-      ])
-    ]).create();
-
-    schedulePub(args: ["build", "--mode", "debug", "example"],
-        output: new RegExp(r'Built \d+ files to "build".'));
-
-    d.dir(appPath, [
-      d.dir('build', [
-        d.dir('example', [
-          d.file("main.dart", 'myapp() => print("not entrypoint");'),
-          d.dir('packages', [
-            d.dir('foo', [
-              d.file('foo.dart', 'foo() => print("hello");'),
-              d.dir("sub", [
-                d.file('bar.dart', 'bar() => print("hello");'),
-              ])
-            ])
-          ]),
-          d.dir("sub", [
-            d.file("main.dart", 'myapp() => print("not entrypoint");'),
-            // Does *not* copy packages into subdirectories.
-            d.nothing("packages")
-          ])
-        ])
-      ])
-    ]).validate();
-  });
-}