Refactor Source and SourceRegistry.

test/dependency_computer/utils.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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.
 
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as p;
 import 'package:pub/src/barback/cycle_exception.dart';
 import 'package:pub/src/barback/dependency_computer.dart';
 import 'package:pub/src/entrypoint.dart';
 import 'package:pub/src/io.dart';
 import 'package:pub/src/package.dart';
 import 'package:pub/src/package_graph.dart';
-import 'package:pub/src/source/path.dart';
 import 'package:pub/src/system_cache.dart';
 import 'package:pub/src/utils.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../test_pub.dart';
 
 /// Expects that [DependencyComputer.transformersNeededByTransformers] will
 /// return a graph matching [expected] when run on the package graph defined by
 /// packages in the sandbox.
 void expectDependencies(Map<String, Iterable<String>> expected) {
@@ skipping 47 matching lines @@
 }
 
 /// Loads a [PackageGraph] from the packages in the sandbox.
 ///
 /// This graph will also include barback and its transitive dependencies from
 /// the repo.
 PackageGraph _loadPackageGraph() {
   // Load the sandbox packages.
   var packages = {};
 
-  var systemCache = new SystemCache(p.join(sandboxDir, cachePath));
-  systemCache.sources
-      ..register(new PathSource())
-      ..setDefault('path');
+  var systemCache = new SystemCache(rootDir: p.join(sandboxDir, cachePath));
+  systemCache.sources.setDefault('path');
   var entrypoint = new Entrypoint(p.join(sandboxDir, appPath), systemCache);
 
   for (var package in listDir(sandboxDir)) {
     if (!fileExists(p.join(package, 'pubspec.yaml'))) continue;
     var packageName = p.basename(package);
     packages[packageName] = new Package.load(
         packageName, package, systemCache.sources);
   }
 
   loadPackage(packageName) {
@@ skipping 23 matching lines @@
 
   buffer.writeln("""
 NoOpTransformer extends Transformer {
   bool isPrimary(AssetId id) => true;
   void apply(Transform transform) {}
 }
 """);
 
   return buffer.toString();
 }