Tests: more Node.js tests.

test/node/promise_end/app.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+
+var fs = require('fs');
+
+require('unit-http').createServer(function (req, res) {
+    res.write('blah');
+
+    Promise.resolve().then(() => {
+        res.end();
+    });
+
+    req.on('data', (data) => {
+        fs.appendFile('callback', '', function() {});
+    });
+
+}).listen(7080);