- Add getters for the current packageRoot or packageMap.

tests/standalone/io/platform_test.dart

Index: tests/standalone/io/platform_test.dart
diff --git a/tests/standalone/io/platform_test.dart b/tests/standalone/io/platform_test.dart
index f07475061da1081074421882db52acabbd972dcf..f50675e360ef6c12a1e6846130b4cbf7fb5bef5e 100644
--- a/tests/standalone/io/platform_test.dart
+++ b/tests/standalone/io/platform_test.dart
@@ -9,7 +9,8 @@ import "dart:isolate";
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 
-test() {
+test() async {
+  asyncStart();
   Expect.isTrue(Platform.numberOfProcessors > 0);
   var os = Platform.operatingSystem;
   Expect.isTrue(os == "android" || os == "linux" || os == "macos" ||
@@ -48,17 +49,25 @@ test() {
   Expect.isTrue(Platform.script.toFilePath().startsWith(oldDir.path));
   // Restore dir.
   Directory.current = oldDir;
-  Directory packageRoot = new Directory(Platform.packageRoot);
+  String platformPackageRoot = (await Platform.packageRoot).toFilePath();
+  Directory packageRoot = new Directory(platformPackageRoot);
   Expect.isTrue(packageRoot.existsSync());
   Expect.isTrue(new Directory("${packageRoot.path}/expect").existsSync());
   Expect.isTrue(Platform.executableArguments.any(
-      (arg) => arg.contains(Platform.packageRoot)));
+      (arg) {
+        if (!arg.startsWith("--package-root=")) {
+          return false;
+        }
+        var commandPackageRoot = arg.replaceFirst("--package-root=", "");
+        return platformPackageRoot.endsWith(commandPackageRoot);
+      }));
+  asyncEnd();
 }
 
-void f(reply) {
+f(reply) async {
   reply.send({"Platform.executable": Platform.executable,
               "Platform.script": Platform.script,
-              "Platform.packageRoot": Platform.packageRoot,
+              "Platform.packageRoot": (await Platform.packageRoot).toString(),
               "Platform.executableArguments": Platform.executableArguments});
 }
 
@@ -66,7 +75,7 @@ testIsolate() {
   asyncStart();
   ReceivePort port = new ReceivePort();
   var remote = Isolate.spawn(f, port.sendPort);
-  port.first.then((results) {
+  port.first.then((results) async {
     Expect.equals(Platform.executable, results["Platform.executable"]);
 
     Uri uri = results["Platform.script"];
@@ -74,7 +83,8 @@ testIsolate() {
     // case was a relative path.
     Expect.equals("file", uri.scheme);
     Expect.isTrue(uri.path.endsWith('tests/standalone/io/platform_test.dart'));
-    Expect.equals(Platform.packageRoot, results["Platform.packageRoot"]);
+    var packageRoot = await Platform.packageRoot;
+    Expect.equals(packageRoot.toString(), results["Platform.packageRoot"]);
     Expect.listEquals(Platform.executableArguments,
                       results["Platform.executableArguments"]);
     asyncEnd();