test: listen on exclusive port in cluster workers

Test that listening on exclusive ports with the cluster module works
correctly.

Reviewed-by: Trevor Norris <trev.norris@gmail.com>

test/simple/test-net-listen-exclusive-random-ports.js

@@ -0,0 +1,56 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common');
+var assert = require('assert');
+var cluster = require('cluster');
+var net = require('net');
+
+function noop() {}
+
+if (cluster.isMaster) {
+  var worker1 = cluster.fork();
+
+  worker1.on('message', function(port1) {
+    assert.equal(port1, port1 | 0, 'first worker could not listen');
+    var worker2 = cluster.fork();
+
+    worker2.on('message', function(port2) {
+      assert.equal(port2, port2 | 0, 'second worker could not listen');
+      assert.notEqual(port1, port2, 'ports should not be equal');
+      worker1.kill();
+      worker2.kill();
+    });
+  });
+} else {
+  var server = net.createServer(noop);
+
+  server.on('error', function(err) {
+    process.send(err.code);
+  });
+
+  server.listen({
+    port: 0,
+    exclusive: true
+  }, function() {
+    process.send(server.address().port);
+  });
+}