Add the ability to run tests with several sets of VM flags

runtime/tests/dart/src/EchoServerTest.dart

 // Copyright (c) 2011, 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.
 //
 // Echo server test program for testing sockets.
+//
+// VMOptions=
+// VMOptions=--short_socket_read
+// VMOptions=--short_socket_write
+// VMOptions=--short_socket_read --short_socket_write
 
 class EchoServerTest {
 
   static void testMain() {
     EchoServerGame echoServerGame = new EchoServerGame.start();
   }
 }
 
 class EchoServerGame {
 
@@ skipping 11 matching lines @@
     for (int i = 0; i < MSGSIZE; i++) {
       _buffer[i] = FIRSTCHAR + i;
     }
     new EchoServer().spawn().then((SendPort port) {
       _sendPort = port;
       start();
     });
   }
 
   void sendData() {
+    Socket _socket;
 
     void messageHandler() {
 
       List<int> bufferReceived = new List<int>(MSGSIZE);
       int bytesRead = 0;
 
       void handleRead() {
-
-        if (_socket.available() > 0) {
-          bytesRead += _socket.readList(
-              bufferReceived, bytesRead, MSGSIZE - bytesRead);
-        }
+        bytesRead += _socket.readList(
+            bufferReceived, bytesRead, MSGSIZE - bytesRead);
         if (bytesRead < MSGSIZE) {
-          /*
-           * We check every time the whole buffer to verify data integrity.
-           */
+          // We check every time the whole buffer to verify data integrity.
           for (int i = 0; i < bytesRead; i++) {
             Expect.equals(FIRSTCHAR + i, bufferReceived[i]);
           }
           _socket.setDataHandler(handleRead);
-        }
-        else {
-          /*
-           * We check every time the whole buffer to verify data integrity.
-           */
+        } else {
+          // We check every time the whole buffer to verify data integrity.
           for (int i = 0; i < MSGSIZE; i++) {
             Expect.equals(FIRSTCHAR + i, bufferReceived[i]);
           }
           _messages++;
           _socket.close();
           if (_messages < MESSAGES) {
             sendData();
           } else {
             shutdown();
           }
@@ skipping 51 matching lines @@
   }
 
   void shutdown() {
     _sendPort.send(SERVERSHUTDOWN, _receivePort.toSendPort());
     _receivePort.close();
   }
 
   int _port;
   ReceivePort _receivePort;
   SendPort _sendPort;
-  Socket _socket;
   List<int> _buffer;
   int _messages;
 }
 
 class EchoServer extends Isolate {
 
   static final HOST = "127.0.0.1";
   static final msgSize = EchoServerGame.MSGSIZE;
 
 
   void main() {
 
     void connectionHandler() {
       Socket _client;
 
       void messageHandler() {
 
         List<int> buffer = new List<int>(msgSize);
         int bytesRead = 0;
 
         void handleRead() {
-          if (_client.available() > 0) {
-            bytesRead += _client.readList(buffer, bytesRead, msgSize - bytesRead);
-          }
-          if (bytesRead < msgSize) {
-            /*
-             * We check every time the whole buffer to verify data integrity.
-             */
-            for (int i = 0; i < bytesRead; i++) {
-              Expect.equals(EchoServerGame.FIRSTCHAR + i, buffer[i]);
+          int read = _client.readList(buffer, bytesRead, msgSize - bytesRead);
+          if (read > 0) {
+            bytesRead += read;
+            if (bytesRead < msgSize) {
+              // We check every time the whole buffer to verify data integrity.
+              for (int i = 0; i < bytesRead; i++) {
+                Expect.equals(EchoServerGame.FIRSTCHAR + i, buffer[i]);
+              }
+              _client.setDataHandler(handleRead);
+            } else {
+              // We check every time the whole buffer to verify data integrity.
+              for (int i = 0; i < msgSize; i++) {
+                Expect.equals(EchoServerGame.FIRSTCHAR + i, buffer[i]);
+              }
+
+              void writeMessage() {
+
+                int bytesWritten = 0;
+
+                void handleWrite() {
+                  int written = _client.writeList(
+                        buffer, bytesWritten, msgSize - bytesWritten);
+                  bytesWritten += written;
+                  if (bytesWritten < msgSize) {
+                    _client.setWriteHandler(handleWrite);
+                  }
+                }
+                handleWrite();
+              }
+              writeMessage();
             }
-            _client.setDataHandler(handleRead);
-          }
-          else {
-            /*
-             * We check every time the whole buffer to verify data integrity.
-             */
-            for (int i = 0; i < msgSize; i++) {
-              Expect.equals(EchoServerGame.FIRSTCHAR + i, buffer[i]);
-            }
-
-            void writeMessage() {
-
-              int bytesWritten = 0;
-
-              void handleWrite() {
-                bytesWritten += _client.writeList(
-                      buffer, bytesWritten, msgSize - bytesWritten);
-                if (bytesWritten < msgSize) {
-                  _client.setWriteHandler(handleWrite);
-                }
-              }
-              handleWrite();
-            }
-            writeMessage();
           }
         }
 
         handleRead();
       }
 
       void closeHandler() {
         _client.close();
       }
 
@@ skipping 26 matching lines @@
       }
     });
   }
 
   ServerSocket _server;
 }
 
 main() {
   EchoServerTest.testMain();
 }