new file mode 100644
--- /dev/null
+++ b/src/testdir/test_netbeans.py
@@ -0,0 +1,91 @@
+#!/usr/bin/python
+#
+# Server that will communicate with Vim through the netbeans interface.
+# Used by test_netbeans.vim.
+#
+# This requires Python 2.6 or later.
+
+from __future__ import print_function
+import socket
+import sys
+import time
+import threading
+
+try:
+    # Python 3
+    import socketserver
+except ImportError:
+    # Python 2
+    import SocketServer as socketserver
+
+class ThreadedTCPRequestHandler(socketserver.BaseRequestHandler):
+
+    def handle(self):
+        print("=== socket opened ===")
+        while True:
+            try:
+                received = self.request.recv(4096).decode('utf-8')
+            except socket.error:
+                print("=== socket error ===")
+                break
+            except IOError:
+                print("=== socket closed ===")
+                break
+            if received == '':
+                print("=== socket closed ===")
+                break
+            print("received: {0}".format(received))
+
+            # Write the received line into the file, so that the test can check
+            # what happened.
+            with open("Xnetbeans", "a") as myfile:
+                myfile.write(received)
+
+            response = ''
+            if received.find('Makefile') > 0:
+                name = received.split('"')[1]
+                response = '5:putBufferNumber!33 "' + name + '"\n'
+                response += '5:setDot!1 2/19\n'
+            elif received.find('disconnect') > 0:
+                # we're done
+                self.server.shutdown()
+                return
+
+            if len(response) > 0:
+                self.request.sendall(response)
+                # Write the respoinse into the file, so that the test can knows
+                # the command was sent.
+                with open("Xnetbeans", "a") as myfile:
+                    myfile.write('send: ' + response)
+
+class ThreadedTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
+    pass
+
+def writePortInFile(port):
+    # Write the port number in Xportnr, so that the test knows it.
+    f = open("Xportnr", "w")
+    f.write("{0}".format(port))
+    f.close()
+
+if __name__ == "__main__":
+    HOST, PORT = "localhost", 0
+
+    server = ThreadedTCPServer((HOST, PORT), ThreadedTCPRequestHandler)
+    ip, port = server.server_address
+
+    # Start a thread with the server.  That thread will then start a new thread
+    # for each connection.
+    server_thread = threading.Thread(target=server.serve_forever)
+    server_thread.start()
+
+    writePortInFile(port)
+
+    print("Listening on port {0}".format(port))
+
+    # Main thread terminates, but the server continues running
+    # until server.shutdown() is called.
+    try:
+        while server_thread.isAlive(): 
+            server_thread.join(1)
+    except (KeyboardInterrupt, SystemExit):
+        server.shutdown()