Make pub's binstubs resilient to changes in snapshot format.

sdk/lib/_internal/pub/test/global/binstubs/outdated_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.
+
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+import 'package:scheduled_test/scheduled_process.dart';
+import 'package:scheduled_test/scheduled_stream.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../../../lib/src/io.dart';
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+import 'utils.dart';
+
+main() {
+  initConfig();
+  integration("a binstub runs 'pub global run' for an outdated snapshot", () {
+    servePackages((builder) {
+      builder.serve("foo", "1.0.0", pubspec: {
+        "executables": {
+          "foo-script": "script"
+        }
+      }, contents: [
+        d.dir("bin", [
+          d.file("script.dart", "main(args) => print('ok \$args');")
+        ])
+      ]);
+    });
+
+    schedulePub(args: ["global", "activate", "foo"]);
+
+    d.dir(cachePath, [
+      d.dir('global_packages', [
+        d.dir('foo', [
+          d.dir('bin', [d.outOfDateSnapshot('script.dart.snapshot')])
+        ])
+      ])
+    ]).create();
+
+    var process = new ScheduledProcess.start(
+        p.join(sandboxDir, cachePath, "bin", binStubName("foo-script")),
+        ["arg1", "arg2"],
+        environment: getEnvironment());
+
+    process.stderr.expect(startsWith("Wrong script snapshot version"));
+    process.stdout.expect(consumeThrough("ok [arg1, arg2]"));
+    process.shouldExit();
+
+    d.dir(cachePath, [
+      d.dir('global_packages/foo/bin', [
+        d.binaryMatcherFile('script.dart.snapshot', isNot(equals(
+            readBinaryFile(testAssetPath('out-of-date.snapshot')))))
+      ])
+    ]).validate();
+  });
+}