cluster: test events emit on cluster.worker

v0.10 and node docs specific that in a worker, the 'message' and 'error'
event emits on process, and on cluster.worker.

Reviewed-By: Fedor Indutny <fedor@indutny.com>

test/simple/test-cluster-worker-events.js

@@ -0,0 +1,77 @@
+// 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 assert = require('assert');
+var cluster = require('cluster');
+
+var OK = 2;
+
+if (cluster.isMaster) {
+
+  var worker = cluster.fork();
+
+  worker.on('exit', function(code) {
+    assert.equal(code, OK);
+    process.exit(0);
+  });
+
+  worker.send('SOME MESSAGE');
+
+  return;
+}
+
+// Messages sent to a worker will be emitted on both the process object and the
+// process.worker object.
+
+assert(cluster.isWorker);
+
+var sawProcess;
+var sawWorker;
+
+process.on('message', function(m) {
+  assert(!sawProcess);
+  sawProcess = true;
+  check(m);
+});
+
+cluster.worker.on('message', function(m) {
+  assert(!sawWorker);
+  sawWorker = true;
+  check(m);
+});
+
+var messages = [];
+
+function check(m) {
+  messages.push(m);
+
+  if (messages.length < 2) return;
+
+  assert.deepEqual(messages[0], messages[1]);
+
+  cluster.worker.once('error', function(e) {
+    assert.equal(e, 'HI');
+    process.exit(OK);
+  });
+
+  process.emit('error', 'HI');
+}