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

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

+// 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';
+
+main() {
+  initConfig();
+  integration("creates a snapshot for an immediate dependency's executables",
+      () {
+    servePackages([packageMap("foo", "1.2.3")], contents: [
+      d.dir("bin", [
+        d.file("hello.dart", "void main() => print('hello!');"),
+        d.file("goodbye.dart", "void main() => print('goodbye!');"),
+        d.file("shell.sh", "echo shell"),
+        d.dir("subdir", [
+          d.file("sub.dart", "void main() => print('sub!');")
+        ])
+      ])
+    ]);
+
+    d.appDir({"foo": "1.2.3"}).create();
+
+    pubGet(output: allOf([
+      contains("Precompiled foo:hello."),
+      contains("Precompiled foo:goodbye.")
+    ]));
+
+    d.dir(p.join(appPath, '.pub', 'bin'), [
+      d.file('sdk-version', '0.1.2+3'),
+      d.dir('foo', [
+        d.matcherFile('hello.dart.snapshot', contains('hello!')),
+        d.matcherFile('goodbye.dart.snapshot', contains('goodbye!')),
+        d.nothing('shell.sh.snapshot'),
+        d.nothing('subdir')
+      ])
+    ]).validate();
+
+    var process = pubRun(args: ['foo:hello']);
+    process.stdout.expect("hello!");
+    process.shouldExit();
+
+    process = pubRun(args: ['foo:goodbye']);
+    process.stdout.expect("goodbye!");
+    process.shouldExit();
+  });
+}