Make Transform a little more pleasant to use:

pkg/barback/test/transformer/mock.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.
 
 library barback.test.transformer.mock;
 
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:barback/src/utils.dart';
@@ skipping 111 matching lines @@
 
   /// Like [Transform.getInput], but respects [pauseGetInput].
   ///
   /// This is intended for use by subclasses of [MockTransformer].
   Future<Asset> getInput(Transform transform, AssetId id) {
     return newFuture(() {
       if (_getInput.containsKey(id)) return _getInput[id].future;
     }).then((_) => transform.getInput(id));
   }
 
-  /// Like [Transform.primaryInput], but respects [pauseGetInput].
-  ///
-  /// This is intended for use by subclasses of [MockTransformer].
-  Future<Asset> getPrimary(Transform transform) =>

[nweiz, 2013/08/28 19:29:43]

We should keep this around so [pauseGetInput] still works for primary inputs.

[Bob Nystrom, 2013/08/28 20:51:27]

Done, but modified to actually call primaryInput instead of just getInput() to
cover that code path.

-      getInput(transform, transform.primaryId);
-
   Future<bool> isPrimary(Asset asset) {
     return newFuture(() => doIsPrimary(asset)).then((result) {
       return newFuture(() {
         if (_isPrimary.containsKey(asset.id)) {
           return _isPrimary[asset.id].future;
         }
       }).then((_) => result);
     });
   }
 
   Future apply(Transform transform) {
     _numRuns++;
     if (_runningTransforms == 0) _started.complete();
     _runningTransforms++;
     return newFuture(() => doApply(transform)).then((_) {
       if (_apply != null) return _apply.future;
     }).whenComplete(() {
       _runningTransforms--;
       if (_runningTransforms == 0) _started = new Completer();
     });
   }
 
   /// The wrapped version of [isPrimary] for subclasses to override.
   Future<bool> doIsPrimary(Asset asset);
 
   /// The wrapped version of [doApply] for subclasses to override.
   Future doApply(Transform transform);
 }