tests: add explicit unit test for no password auth

Author: dougwilson

test/unit/connection/test-no-password.js

@@ -0,0 +1,31 @@
+var assert     = require('assert');
+var common     = require('../../common');
+var connection = common.createConnection({
+  port     : common.fakeServerPort,
+  password : null,
+  user     : 'root'
+});
+
+var server = common.createFakeServer();
+
+server.listen(common.fakeServerPort, function (err) {
+  assert.ifError(err);
+
+  connection.connect(function (err) {
+    assert.ifError(err);
+    connection.destroy();
+    server.destroy();
+  });
+});
+
+server.on('connection', function(incomingConnection) {
+  incomingConnection.on('clientAuthentication', function (packet) {
+    if (packet.scrambleBuff.length === 0) {
+      this.ok();
+    } else {
+      this.deny();
+    }
+  });
+
+  incomingConnection.handshake();
+});