"pub global run" errors out for a mismatched SDK.

test/global/run/fails_if_sdk_constraint_is_unmet_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 'package:scheduled_test/scheduled_stream.dart';
+import 'package:pub/src/exit_codes.dart' as exit_codes;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
-  integration('recompiles a script if the SDK version is out-of-date', () {
+  integration("fails if the current SDK doesn't match the constraint", () {
     servePackages((builder) {
       builder.serve("foo", "1.0.0", contents: [
         d.dir("bin", [
           d.file("script.dart", "main(args) => print('ok');")
         ])
       ]);
     });
 
     schedulePub(args: ["global", "activate", "foo"]);
 
+    d.hostedCache([
+      d.dir("foo-1.0.0", [
+        d.libPubspec("foo", "1.0.0", sdk: "0.5.6")
+      ])
+    ]).create();
+
+    // Make the snapshot out-of-date, too, so that we load the pubspec with the
+    // SDK constraint in the first place. In practice, the VM snapshot
+    // invalidation logic is based on the version anyway, so this is a safe
+    // assumption.
     d.dir(cachePath, [
       d.dir('global_packages', [
         d.dir('foo', [
           d.dir('bin', [d.outOfDateSnapshot('script.dart.snapshot')])
         ])
       ])
     ]).create();
 
-    var pub = pubRun(global: true, args: ["foo:script"]);
-    // In the real world this would just print "hello!", but since we collect
-    // all output we see the precompilation messages as well.
-    pub.stdout.expect("Precompiling executables...");
-    pub.stdout.expect(consumeThrough("ok"));
-    pub.shouldExit();
-
-    d.dir(cachePath, [
-      d.dir('global_packages', [
-        d.dir('foo', [
-          d.dir('bin', [
-            d.matcherFile('script.dart.snapshot', contains('ok'))
-          ])
-        ])
-      ])
-    ]).validate();
+    schedulePub(args: ["global", "run", "foo:script"],
+        error: contains("foo 1.0.0 doesn't support Dart 0.1.2+3."),
+        exitCode: exit_codes.DATA);
   });
 }