Use scheduled_test for Pub tests.

utils/tests/pub/descriptor/tar.dart

Index: utils/tests/pub/descriptor/tar.dart
diff --git a/utils/tests/pub/descriptor/tar.dart b/utils/tests/pub/descriptor/tar.dart
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+// 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.tar;
+
+import 'dart:io';
+import 'dart:async';
+
+import '../../../../pkg/pathos/lib/path.dart' as path;
+import '../../../../pkg/scheduled_test/lib/scheduled_test.dart';
+import '../../../../pkg/scheduled_test/lib/descriptor.dart';
+
+import '../../../pub/io.dart';
+import '../../../pub/utils.dart';
+
+/// Describes a tar file and its contents.
+class TarFileDescriptor extends DirectoryDescriptor {
+  TarFileDescriptor(String name, List<Descriptor> contents)
+      : super(name, contents);
+
+  /// Creates the files and directories within this tar file, then archives
+  /// them, compresses them, and saves the result to [parentDir].
+  Future<String> create([String parent]) => schedule(() {
+    if (parent == null) parent = defaultRoot;
+    return withTempDir((tempDir) {
+      return Future.wait(contents.map((entry) {
+        return entry.create(tempDir);
+      })).then((_) {
+        return listDir(tempDir, recursive: true, includeHiddenFiles: true);
+      }).then((createdContents) {
+        return createTarGz(createdContents, baseDir: tempDir).toBytes();
+      }).then((bytes) {
+        var file = path.join(parent, name);
+        writeBinaryFile(file, bytes);
+        return file;
+      });
+    });
+  }, 'creating tar file:\n${describe()}');
+
+  /// Validates that the `.tar.gz` file at [path] contains the expected
+  /// contents.
+  Future validate([String parent]) {
+    throw "TODO(nweiz): implement this";
+  }
+
+  Stream<List<int>> read() {
+    return new Stream<List<int>>.fromFuture(withTempDir((tempDir) {
+      return create(tempDir).then((_) =>
+          readBinaryFile(path.join(tempDir, name)));
+    }));
+  }
+}