Stress test for http upload timeouts

This was meant to find a bug in setTimeout, but there doesn't seem to be
one. So this test can no help to prevent future regressions.

test/pummel/test-http-upload-timeout.js

@@ -0,0 +1,43 @@
+// This tests setTimeout() by having multiple clients connecting and sending
+// data in random intervals. Clients are also randomly disconnecting until there
+// are no more clients left. If no false timeout occurs, this test has passed.
+var common = require("../common"),
+    assert = require("assert"),
+    http = require('http'),
+    server = http.createServer(),
+    connections = 0;
+
+server.on('request', function(req, res) {
+  req.socket.setTimeout(1000);
+  req.socket.on('timeout', function() {
+    throw new Error('Unexpected timeout');
+  });
+  req.on('end', function() {
+    connections--;
+    req.socket.end();
+    if (connections == 0) {
+      server.close();
+    }
+  });
+});
+server.listen(common.PORT, '127.0.0.1', function() {
+  for (var i = 0; i < 10; i++) {
+    connections++;
+
+    setTimeout(function() {
+      var client = http.createClient(common.PORT, '127.0.0.1'),
+          request = client.request('POST', '/');
+
+      function ping() {
+        var nextPing = (Math.random() * 900).toFixed();
+        if (nextPing > 600) {
+          request.end();
+          return;
+        }
+        request.write('ping');
+        setTimeout(ping, nextPing);
+      }
+      ping();
+    }, i * 50);
+  }
+});