Precompile dependencies' executables for use with "pub run".

sdk/lib/_internal/pub/test/snapshot/snapshots_transformed_code_test.dart

Index: sdk/lib/_internal/pub/test/snapshot/snapshots_transformed_code_test.dart
diff --git a/sdk/lib/_internal/pub/test/snapshot/snapshots_transformed_code_test.dart b/sdk/lib/_internal/pub/test/snapshot/snapshots_transformed_code_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..38018ced4ecaaabfe467081ff3ced612d9f65f12
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/snapshot/snapshots_transformed_code_test.dart
@@ -0,0 +1,61 @@
+// Copyright (c) 2014, 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:path/path.dart' as p;
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+
+const REPLACE_TRANSFORMER = """
+import 'dart:async';
+
+import 'package:barback/barback.dart';
+
+class ReplaceTransformer extends Transformer {
+  ReplaceTransformer.asPlugin();
+
+  String get allowedExtensions => '.dart';
+
+  Future apply(Transform transform) {
+    return transform.primaryInput.readAsString().then((contents) {
+      transform.addOutput(new Asset.fromString(transform.primaryInput.id,
+          contents.replaceAll("REPLACE ME", "hello!")));
+    });
+  }
+}
+""";
+
+main() {
+  initConfig();
+  integration("snapshots the transformed version of an executable", () {
+    servePackages([
+      packageMap("foo", "1.2.3", {"barback": "any"})
+          ..addAll({'transformers': ['foo']})
+    ], contents: [
+      d.dir("lib", [d.file("foo.dart", REPLACE_TRANSFORMER)]),
+      d.dir("bin", [
+        d.file("hello.dart", """
+final message = 'REPLACE ME';
+
+void main() => print(message);
+"""),
+      ])
+    ], serveBarback: true);
+
+    d.appDir({"foo": "1.2.3"}).create();
+
+    pubGet(output: contains("Precompiled foo:hello."));
+
+    d.dir(p.join(appPath, '.pub', 'bin'), [
+      d.dir('foo', [d.matcherFile('hello.dart.snapshot', contains('hello!'))])
+    ]).validate();
+
+    var process = pubRun(args: ['foo:hello']);
+    process.stdout.expect("hello!");
+    process.shouldExit();
+  });
+}