Dev dependencies.

utils/tests/pub/test_pub.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.
 
 /// Test infrastructure for testing pub. Unlike typical unit tests, most pub
 /// tests are integration tests that stage some stuff on the file system, run
 /// pub, and then validate the results. This library provides an API to build
 /// tests like that.
 library test_pub;
 
@@ skipping 1155 matching lines @@
     withTempDir((tempDir) {
       return create(tempDir).then((tar) {
         var sourceStream = new File(tar).openRead();
         return store(sourceStream, controller);
       });
     });
     return new ByteStream(controller.stream);
   }
 }
 
-/// A descriptor that validates that no file exists with the given name.
+/// A descriptor that validates that no file or directory exists with the given
+/// name.
 class NothingDescriptor extends Descriptor {
   NothingDescriptor(String name) : super(name);
 
   Future create(dir) => new Future.immediate(null);
   Future delete(dir) => new Future.immediate(null);
 
   Future validate(String dir) {
     return defer(() {
       if (entryExists(path.join(dir, name))) {
-        throw new TestFailure('File $name in $dir should not exist.');
+        throw new TestFailure('Entry $name in $dir should not exist.');
       }
     });
   }
 
   ByteStream load(List<String> path) {
     if (path.isEmpty) {
       throw "Can't load the contents of $name: it doesn't exist.";
     } else {
       throw "Can't load ${path.join('/')} from within $name: $name doesn't "
         "exist.";
@@ skipping 436 matching lines @@
 /// calling [completion] is unnecessary.
 void expectLater(Future actual, matcher, {String reason,
     FailureHandler failureHandler, bool verbose: false}) {
   _schedule((_) {
     return actual.then((value) {
       expect(value, matcher, reason: reason, failureHandler: failureHandler,
           verbose: false);
     });
   });
 }