Use "package:" imports for pub.

test/validator/executable_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:pub/src/entrypoint.dart';
+import 'package:pub/src/validator.dart';
+import 'package:pub/src/validator/executable.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
-import '../../lib/src/entrypoint.dart';
-import '../../lib/src/validator.dart';
-import '../../lib/src/validator/executable.dart';
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 Validator executable(Entrypoint entrypoint) =>
   new ExecutableValidator(entrypoint);
 
 main() {
   initConfig();
 
@@ skipping 28 matching lines @@
           "executables": {
             "nope": "not_there",
             "nada": null
           }
         })
       ]).create();
       expectValidationWarning(executable);
     });
   });
 }