Run pub tests against older versions of barback.

third_party/pkg/barback-0.13.0/lib/src/package_graph.dart

Index: third_party/pkg/barback-0.13.0/lib/src/package_graph.dart
diff --git a/pkg/barback/lib/src/graph/package_graph.dart b/third_party/pkg/barback-0.13.0/lib/src/package_graph.dart
similarity index 92%
copy from pkg/barback/lib/src/graph/package_graph.dart
copy to third_party/pkg/barback-0.13.0/lib/src/package_graph.dart
index 8cd47157d15142cec615679a250aafc516e804d4..c503c601c5c774a3448aa28904dc22ed3fbb40ec 100644
--- a/pkg/barback/lib/src/graph/package_graph.dart
+++ b/third_party/pkg/barback-0.13.0/lib/src/package_graph.dart
@@ -2,22 +2,21 @@
 // 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 barback.graph.package_graph;
+library barback.package_graph;
 
 import 'dart:async';
 import 'dart:collection';
 
-import '../asset/asset_id.dart';
-import '../asset/asset_node.dart';
-import '../asset/asset_set.dart';
-import '../build_result.dart';
-import '../errors.dart';
-import '../log.dart';
-import '../package_provider.dart';
-import '../transformer/transformer.dart';
-import '../utils.dart';
 import 'asset_cascade.dart';
-import 'node_status.dart';
+import 'asset_id.dart';
+import 'asset_node.dart';
+import 'asset_set.dart';
+import 'build_result.dart';
+import 'errors.dart';
+import 'log.dart';
+import 'package_provider.dart';
+import 'transformer.dart';
+import 'utils.dart';
 
 /// The collection of [AssetCascade]s for an entire application.
 ///
@@ -56,9 +55,8 @@ class PackageGraph {
   Stream<LogEntry> get log => _logController.stream;
   final _logController = new StreamController<LogEntry>.broadcast(sync: true);
 
-  /// How far along [this] is in processing its assets.
-  NodeStatus get _status => NodeStatus.dirtiest(
-      _cascades.values.map((cascade) => cascade.status));
+  /// Whether [this] is dirty and still has more processing to do.
+  bool get _isDirty => _cascades.values.any((cascade) => cascade.isDirty);
 
   /// Whether a [BuildResult] is scheduled to be emitted on [results] (see
   /// [_tryScheduleResult]).
@@ -91,9 +89,7 @@ class PackageGraph {
         var cascade = new AssetCascade(this, package);
         _cascades[package] = cascade;
         cascade.onLog.listen(_onLog);
-        cascade.onStatusChange.listen((status) {
-          if (status == NodeStatus.IDLE) _tryScheduleResult();
-        });
+        cascade.onDone.listen((_) => _tryScheduleResult());
       }
 
       _errors = mergeStreams(_cascades.values.map((cascade) => cascade.errors),
@@ -130,7 +126,7 @@ class PackageGraph {
       _inErrorZone(() => cascade.forceAllTransforms());
     }
 
-    if (_status != NodeStatus.IDLE) {
+    if (_isDirty) {
       // A build is still ongoing, so wait for it to complete and try again.
       return results.first.then((_) => getAllAssets());
     }
@@ -226,13 +222,13 @@ class PackageGraph {
   /// [BuildResult]) to ensure that calling multiple functions synchronously
   /// produces only a single [BuildResult].
   void _tryScheduleResult() {
-    if (_status != NodeStatus.IDLE) return;
+    if (_isDirty) return;
     if (_resultScheduled) return;
 
     _resultScheduled = true;
     newFuture(() {
       _resultScheduled = false;
-      if (_status != NodeStatus.IDLE) return;
+      if (_isDirty) return;
 
       _lastResult = new BuildResult(_accumulatedErrors);
       _accumulatedErrors.clear();