Adjust passing-FDs test to wait until socket is really writeable

test/mjsunit/test-net-fd-passing.js

@@ -12,14 +12,13 @@ function fdPassingTest(path, port) {
   var message = "beep toot";
   var expectedData = ["[greeting] " + greeting, "[echo] " + message];
 
-  puts(fixturesDir);
   var receiverArgs = [fixturesDir + "/net-fd-passing-receiver.js", path, greeting];
   var receiver = process.createChildProcess(process.ARGV[0], receiverArgs);
 
   var initializeSender = function() {
     var fdHighway = new net.Socket();
-    fdHighway.connect(path);
 
+    fdHighway.addListener("connect", function() {
       var sender = net.createServer(function(socket) {
         fdHighway.sendFD(socket);
         socket.flush();
@@ -49,6 +48,11 @@ function fdPassingTest(path, port) {
 
       tests_run += 1;
       sender.listen(port);
+    });
+
+    fdHighway.connect(path);
+
+
   };
 
   receiver.addListener("output", function(data) {