Change the way Patterns work in scheduled_test/descriptor.

pkg/scheduled_test/lib/src/descriptor/nothing.dart

Index: pkg/scheduled_test/lib/src/descriptor/nothing.dart
diff --git a/pkg/scheduled_test/lib/src/descriptor/nothing.dart b/pkg/scheduled_test/lib/src/descriptor/nothing.dart
deleted file mode 100644
index 9a1f1b4c6fe48c1a69b8a5889989f088ddcd164b..0000000000000000000000000000000000000000
--- a/pkg/scheduled_test/lib/src/descriptor/nothing.dart
+++ /dev/null
@@ -1,60 +0,0 @@
-// 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.
-
-library descriptor.async;
-
-import 'dart:async';
-import 'dart:io';
-
-import '../../../../../pkg/pathos/lib/path.dart' as path;
-
-import '../../descriptor.dart' as descriptor;
-import '../../scheduled_test.dart';
-import '../utils.dart';
-import 'utils.dart';
-
-/// A descriptor that validates that no file exists with the given name.
-/// Creating this descriptor is a no-op and loading from it is invalid.
-class Nothing extends descriptor.Entry {
-  Nothing(Pattern name)
-      : super(name);
-
-  Future create([String parent]) => new Future.immediate(null);
-
-  Future validate([String parent]) => schedule(() {
-    if (parent == null) parent = descriptor.defaultRoot;
-    if (name is String) {
-      var fullPath = path.join(parent, name);
-      if (new File(fullPath).existsSync()) {
-        throw "Expected nothing to exist at '$fullPath', but found a file.";
-      } else if (new Directory(fullPath).existsSync()) {
-        throw "Expected nothing to exist at '$fullPath', but found a "
-            "directory.";
-      } else {
-        return;
-      }
-    }
-
-    return new Directory(parent).list().toList().then((entries) {
-      var matchingEntries = entries
-          .map((entry) => entry is File ? entry.fullPathSync() : entry.path)
-          .where((entry) => path.basename(entry).contains(name))
-          .toList();
-      matchingEntries.sort();
-
-      if (matchingEntries.length == 0) return;
-      throw "Expected nothing to exist in '$parent' matching $nameDescription, "
-              "but found:\n"
-          "${matchingEntries.map((entry) => '* $entry').join('\n')}";
-    });
-  }, "validating $nameDescription doesn't exist");
-
-  Stream<List<int>> load(String pathToLoad) => errorStream("Nothing "
-      "descriptors don't support load().");
-
-  Stream<List<int>> read() => errorStream("Nothing descriptors don't support "
-      "read().");
-
-  String describe() => "nothing at $nameDescription";
-}