Tests: Node.js application tests.

test/node/write_callback/app.js

@@ -0,0 +1,10 @@
+#!/usr/bin/env node
+
+require('unit-http').createServer(function (req, res) {
+    res.writeHead(200, {'Content-Type': 'text/plain'});
+    var a = 'blah';
+    res.write('hello', 'utf8', function() {
+            a = 'world';
+    });
+    res.end(a);
+}).listen(7080);