Move isPrimary computation from PhaseInput into TransformNode.

pkg/barback/test/package_graph/errors_test.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.package_graph.source_test;
 
 import 'package:barback/src/utils.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../utils.dart';
@@ skipping 38 matching lines @@
     expectNoAsset("app|foo.txt");
     buildShouldSucceed();
   });
 
   test("reports an error for an unprovided package", () {
     initGraph();
     expect(() => updateSourcesSync(["unknown|foo.txt"]), throwsArgumentError);
   });
 
   test("reports an error for an unprovided source", () {
-    initGraph(["app|known.txt"]);
+    initGraph(["app|known.txt"], {"app": [
+      // Have a dummy transformer so that barback at least tries to load the
+      // asset.
+      [new RewriteTransformer("a", "b")]
+    ]});
+
     updateSources(["app|unknown.txt"]);
 
     buildShouldFail([
       isAssetLoadException("app|unknown.txt",
           isAssetNotFoundException("app|unknown.txt"))
     ]);
   });
 
   test("reports missing input errors in results", () {
     initGraph({"app|a.txt": "a.inc"}, {"app": [
@@ skipping 77 matching lines @@
     });
 
     updateSources(["pkg1|foo.txt", "pkg2|foo.txt"]);
     buildShouldFail([
       isTransformerException(equals(BadTransformer.ERROR)),
       isTransformerException(equals(BadTransformer.ERROR))
     ]);
   });
 
   test("an error loading an asset removes the asset from the graph", () {
-    initGraph(["app|foo.txt"]);
+    initGraph(["app|foo.txt"], {"app": [
+      // Have a dummy transformer so that barback at least tries to load the
+      // asset.
+      [new RewriteTransformer("a", "b")]
+    ]});
 
     setAssetError("app|foo.txt");
     updateSources(["app|foo.txt"]);
     expectNoAsset("app|foo.txt");
     buildShouldFail([
       isAssetLoadException("app|foo.txt", isMockLoadException("app|foo.txt"))
     ]);
   });
 
   test("a collision returns the first-produced output", () {
@@ skipping 150 matching lines @@
 
     updateSources(["app|foo.txt"]);
     expectAsset("app|foo.txt", "foo");
     buildShouldSucceed();
 
     updateSources(["app|foo.in"]);
     expectAsset("app|foo.txt", "foo");
     buildShouldFail([isAssetCollisionException("app|foo.txt")]);
   });
 }