--- a/src/testdir/test_netbeans.py
+++ b/src/testdir/test_netbeans.py
@@ -10,6 +10,7 @@ import socket
 import sys
 import time
 import threading
+import re
 
 try:
     # Python 3
@@ -20,8 +21,119 @@ except ImportError:
 
 class ThreadedTCPRequestHandler(socketserver.BaseRequestHandler):
 
+    def process_msgs(self, msgbuf):
+        # Process all the received netbeans commands/responses/events from Vim.
+        # Each one is separated by a newline character. If a partial command
+        # is received, process it later after the rest of it is received.
+        while True:
+            (line, sep, rest) = msgbuf.partition('\n')
+            if sep == '':
+                # received partial line
+                return line
+            msgbuf = rest
+
+            # Process a command only after receiving a newline.
+            response = ''
+            if line.find('Xcmdbuf') > 0:
+                name = line.split('"')[1]
+                response = '1:putBufferNumber!15 "' + name + '"\n'
+                response += '1:startDocumentListen!16\n'
+            elif re.match('1:insert=.* "\\\\n"', line):
+                # extract the command from the previous line
+                cmd = re.search('.*"(.*)"', self.prev_line).group(1)
+                testmap = {
+                  'getCursor_Test' : '0:getCursor/30\n',
+                  'E627_Test' : '0 setReadOnly!31\n',
+                  'E628_Test' : '0:setReadOnly 32\n',
+                  'E632_Test' : '0:getLength/33\n',
+                  'E633_Test' : '0:getText/34\n',
+                  'E634_Test' : '0:remove/35 1 1\n',
+                  'E635_Test' : '0:insert/36 0 "line1\\n"\n',
+                  'E636_Test' : '0:create!37\n',
+                  'E637_Test' : '0:startDocumentListen!38\n',
+                  'E638_Test' : '0:stopDocumentListen!39\n',
+                  'E639_Test' : '0:setTitle!40 "Title"\n',
+                  'E640_Test' : '0:initDone!41\n',
+                  'E641_Test' : '0:putBufferNumber!42 "XSomeBuf"\n',
+                  'E642_Test' : '9:putBufferNumber!43 "XInvalidBuf"\n',
+                  'E643_Test' : '0:setFullName!44 "XSomeBuf"\n',
+                  'E644_Test' : '0:editFile!45 "Xfile3"\n',
+                  'E645_Test' : '0:setVisible!46 T\n',
+                  'E646_Test' : '0:setModified!47 T\n',
+                  'E647_Test' : '0:setDot!48 1/1\n',
+                  'E648_Test' : '0:close!49\n',
+                  'E650_Test' : '0:defineAnnoType!50 1 "abc" "a" "a" 1 1\n',
+                  'E651_Test' : '0:addAnno!51 1 1 1 1\n',
+                  'E652_Test' : '0:getAnno/52 8\n',
+                  'editFile_Test' : '2:editFile!53 "Xfile3"\n',
+                  'getLength_Test' : '2:getLength/54\n',
+                  'getModified_Test' : '2:getModified/55\n',
+                  'getText_Test' : '2:getText/56\n',
+                  'setDot_Test' : '2:setDot!57 3/6\n',
+                  'startDocumentListen_Test' : '2:startDocumentListen!58\n',
+                  'stopDocumentListen_Test' : '2:stopDocumentListen!59\n',
+                  'define_anno_Test' : '2:defineAnnoType!60 1 "s1" "x" "=>" blue none\n',
+                  'E532_Test' : '2:defineAnnoType!61 1 "s1" "x" "=>" aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa none\n',
+                  'add_anno_Test' : '2:addAnno!62 1 1 2/1 0\n',
+                  'get_anno_Test' : '2:getAnno/63 1\n',
+                  'remove_anno_Test' : '2:removeAnno!64 1\n',
+                  'getModifiedAll_Test' : '0:getModified/65\n',
+                  'create_Test' : '3:create!66\n',
+                  'setTitle_Test' : '3:setTitle!67 "Xfile4"\n',
+                  'setFullName_Test' : '3:setFullName!68 "Xfile4"\n',
+                  'initDone_Test' : '3:initDone!69\n',
+                  'setVisible_Test' : '3:setVisible!70 T\n',
+                  'setModtime_Test' : '3:setModtime!71 6\n',
+                  'insert_Test' : '3:insert/72 0 "line1\\nline2\\n"\n',
+                  'remove_Test' : '3:remove/73 3 4\n',
+                  'remove_invalid_offset_Test' : '3:remove/74 900 4\n',
+                  'remove_invalid_count_Test' : '3:remove/75 1 800\n',
+                  'guard_Test' : '3:guard!76 8 7\n',
+                  'setModified_Test' : '3:setModified!77 T\n',
+                  'insertDone_Test' : '3:insertDone!78 T F\n',
+                  'saveDone_Test' : '3:saveDone!79\n',
+                  'invalidcmd_Test' : '3:invalidcmd!80\n',
+                  'invalidfunc_Test' : '3:invalidfunc/81\n',
+                  'removeAnno_fail_Test' : '0:removeAnno/82 1\n',
+                  'guard_fail_Test' : '0:guard/83 1 1\n',
+                  'save_fail_Test' : '0:save/84\n',
+                  'netbeansBuffer_fail_Test' : '0:netbeansBuffer/85 T\n',
+                  'setExitDelay_Test' : '0:setExitDelay!86 2\n',
+                  'setReadOnly_Test' : '3:setReadOnly!87\n',
+                  'close_Test' : '3:close!88\n',
+                  'specialKeys_Test' : '0:specialKeys!89 "F12 F13"\n',
+                  'detach_Test' : '2:close!90\n1:close!91\nDETACH\n'
+                }
+                # execute the specified test
+                if cmd not in testmap:
+                  print("=== invalid command %s ===" % (cmd))
+                else:
+                  response = testmap[cmd]
+            elif line.find('disconnect') > 0:
+                # we're done
+                self.server.shutdown()
+                return
+
+            # save the current line, this is used as the test to run after
+            # receiving a newline only line.
+            self.prev_line = line
+
+            if len(response) > 0:
+                self.request.sendall(response.encode('utf-8'))
+                # 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)
+                if self.debug:
+                    with open("save_Xnetbeans", "a") as myfile:
+                        myfile.write('send: ' + response)
+
     def handle(self):
         print("=== socket opened ===")
+        # To preserve the Xnetbeans file as save_Xnetbeans, set debug to 1
+        self.debug = 0
+        self.prev_line = ''
+        msgbuf = ''
         while True:
             try:
                 received = self.request.recv(4096).decode('utf-8')
@@ -40,23 +152,15 @@ class ThreadedTCPRequestHandler(socketse
             # what happened.
             with open("Xnetbeans", "a") as myfile:
                 myfile.write(received)
+            if self.debug:
+                with open("save_Xnetbeans", "a") as myfile:
+                    myfile.write(received)
 
-            response = ''
-            if received.find('XREADME.txt') > 0:
-                name = received.split('"')[1]
-                response = '5:putBufferNumber!33 "' + name + '"\n'
-                response += '5:setDot!1 3/19\n'
-            elif received.find('disconnect') > 0:
-                # we're done
-                self.server.shutdown()
-                return
-
-            if len(response) > 0:
-                self.request.sendall(response.encode('utf-8'))
-                # 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)
+            # Can receive more than one line in a response or a partial line.
+            # Accumulate all the received characters and process one line at
+            # a time.
+            msgbuf += received
+            msgbuf = self.process_msgs(msgbuf)
 
 class ThreadedTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
     pass