SendPort + ReceivePort changes:

tests/standalone/src/io/FileTest.dart

Index: tests/standalone/src/io/FileTest.dart
diff --git a/tests/standalone/src/io/FileTest.dart b/tests/standalone/src/io/FileTest.dart
index f691c5d1a6425fb2525d7837bfb342d279a69384..f58ab943c1d3369eddd3ef70a084af54e45b88cd 100644
--- a/tests/standalone/src/io/FileTest.dart
+++ b/tests/standalone/src/io/FileTest.dart
@@ -457,8 +457,9 @@ class FileTest {
     asyncTestStarted();
 
     // Port to verify that the test completes.
-    var port = new ReceivePort.singleShot();
+    var port = new ReceivePort();
     port.receive((message, replyTo) {
+      port.close();
       Expect.equals(1, message);
       asyncTestDone("testDirectory");
     });
@@ -856,8 +857,9 @@ class FileTest {
   }
 
   static void testReadAsBytes() {
-    var port = new ReceivePort.singleShot();
+    var port = new ReceivePort();
     port.receive((result, replyTo) {
+      port.close();
       Expect.equals(42, result);
     });
     var name = getFilename("tests/vm/data/fixed_length_file");
@@ -879,8 +881,9 @@ class FileTest {
   }
 
   static void testReadAsText() {
-    var port = new ReceivePort.singleShot();
+    var port = new ReceivePort();
     port.receive((result, replyTo) {
+      port.close();
       Expect.equals(1, result);
     });
     var name = getFilename("tests/vm/data/fixed_length_file");
@@ -931,8 +934,9 @@ class FileTest {
   }
 
   static void testReadAsLines() {
-    var port = new ReceivePort.singleShot();
+    var port = new ReceivePort();
     port.receive((result, replyTo) {
+      port.close();
       Expect.equals(42, result);
     });
     var name = getFilename("tests/vm/data/fixed_length_file");
@@ -962,8 +966,9 @@ class FileTest {
 
 
   static void testReadAsErrors() {
-    var port = new ReceivePort.singleShot();
+    var port = new ReceivePort();
     port.receive((message, _) {
+      port.close();
       Expect.equals(1, message);
     });
     var f = new File('.');