Add Resource package.

test/resource_test.dart

+// Copyright (c) 2015, 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.
+
+import "dart:async" show Future, Stream;
+import "package:resource/resource.dart";
+import "package:test/test.dart";
+import "dart:convert" show Encoding, ASCII;
+
+main() {
+  pkguri(path) => new Uri(scheme: "package", path: path);
+
+  testLoading(String name, PackageResolver resolver) {
+    group("$name resolver", () {
+      testLoad(Uri uri) async {
+        LogLoader loader = new LogLoader();
+        var resource = resolver.resource(uri, loader: loader);
+        var res = await resource.openRead().toList();
+        expect(res, [[0, 0, 0]]);
+        res = await resource.readAsBytes();
+        expect(res, [0, 0, 0]);
+        res = await resource.readAsString(encoding: ASCII);
+        expect(res, "\x00\x00\x00");
+        var resolved = resolver.resolve(uri);
+
+        expect(loader.requests, [["Stream", resolved],
+                                 ["Bytes", resolved],
+                                 ["String", resolved, ASCII]]);
+      }
+
+      test("load package: URIs", () async {
+        await testLoad(pkguri("foo/bar/baz"));
+        await testLoad(pkguri("bar/foo/baz"));
+      });
+      test("load non-pkgUri", () async {
+        await testLoad(Uri.parse("file://localhost/something?x#y"));
+        await testLoad(Uri.parse("http://auth/something?x#y"));
+        await testLoad(Uri.parse("https://auth/something?x#y"));
+        await testLoad(Uri.parse("unknown:/something"));
+      });
+    });
+  }
+  testLoading("root",
+              new PackageResolver.fromRoot(Uri.parse("file:///path/root/")));
+  var fooRoot = Uri.parse("file:///files/foo/");
+  var barRoot = Uri.parse("http://example.com/files/bar/");
+  testLoading("map",
+              new PackageResolver.fromMap({"foo": fooRoot, "bar": barRoot }));
+}
+
+
+class LogLoader implements ResourceLoader {
+  final List requests = [];
+  void reset() { requests.clear(); }
+  Stream<List<int>> openRead(Uri uri) async* {
+    requests.add(["Stream", uri]);
+    yield [0x00, 0x00, 0x00];
+  }
+  Future<List<int>> readAsBytes(Uri uri) async {
+    requests.add(["Bytes", uri]);
+    return [0x00, 0x00, 0x00];
+  }
+  Future<String> readAsString(Uri uri, {Encoding encoding}) async {
+    requests.add(["String", uri, encoding]);
+    return "\x00\x00\x00";
+  }
+}