Increase the datagram receive buffer on Windows to 64k

tests/standalone/io/raw_datagram_socket_test.dart

Index: tests/standalone/io/raw_datagram_socket_test.dart
diff --git a/tests/standalone/io/raw_datagram_socket_test.dart b/tests/standalone/io/raw_datagram_socket_test.dart
index 9b952d6762882c597539673073ecfae6f48d1b9a..c9f5ccc2f273f4b18007562d7bd92db447c595ee 100644
--- a/tests/standalone/io/raw_datagram_socket_test.dart
+++ b/tests/standalone/io/raw_datagram_socket_test.dart
@@ -194,7 +194,7 @@ testLoopbackMulticast() {
   }
 }
 
-testSendReceive(InternetAddress bindAddress) {
+testSendReceive(InternetAddress bindAddress, int dataSize) {
   asyncStart();
 
   var total = 1000;
@@ -218,7 +218,7 @@ testSendReceive(InternetAddress bindAddress) {
       }
 
       Uint8List createDataPackage(int seq) {
-        var data = new Uint8List(1000);
+        var data = new Uint8List(dataSize);
         (new ByteData.view(data.buffer, 0, 4)).setUint32(0, seq);
         return data;
       }
@@ -236,7 +236,7 @@ testSendReceive(InternetAddress bindAddress) {
         // Send a datagram acknowledging the received sequence.
         int bytes = sender.send(
             createDataPackage(seq), bindAddress, receiver.port);
-        Expect.isTrue(bytes == 0 || bytes == 1000);
+        Expect.isTrue(bytes == 0 || bytes == dataSize);
       }
 
       void sendAck(address, port) {
@@ -318,6 +318,8 @@ main() {
   }
   testBroadcast();
   testLoopbackMulticast();
-  testSendReceive(InternetAddress.LOOPBACK_IP_V4);
-  testSendReceive(InternetAddress.LOOPBACK_IP_V6);
+  testSendReceive(InternetAddress.LOOPBACK_IP_V4, 1000);
+  testSendReceive(InternetAddress.LOOPBACK_IP_V6, 1000);
+  testSendReceive(InternetAddress.LOOPBACK_IP_V4, 32 * 1024);
+  testSendReceive(InternetAddress.LOOPBACK_IP_V6, 32 * 1024);

[kustermann, 2015/10/02 15:36:58]

Is it possible to test this with a size of "64kb - ip/udp header sizes"

I guess we can only test bigger packages (and thereby trigger the error) by
manually increasing the MTU?

[Søren Gjesse, 2015/10/06 07:01:42]

Added a test for size 64k - 32.

 }