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1）vpp 自动化测试方法
????????在源码目录下，执行 make test 命令可进行自动化测试，并可通过 make test-help 来查看具体的参数信息。
2）如果在执行 make test 时，vpp 报错，或者 vpp?crash，导致 python 侧?IO 超时，比如：
...
Starting ACL create/delete test ...
------------------------------------------------------------------------------
Received read timeout 5s
11:44:08,004 [Errno 2] No such file or directory
Received read timeout 5s
11:44:13,001 [Errno 2] No such file or directory
------------------------------------------------------------------------------
...
==============================================================================
ERROR: ACL create/delete test
------------------------------------------------------------------------------
Traceback (most recent call last):
File "test_acl_plugin.py", line 603, in test_0001_acl_create
acls=[first_acl])
File "/root/vpp/build-root/rpmbuild/vpp-18.07.1/test/vpp_papi_provider.py", line 2864, in acl_interface_set_acl_list
expected_retval=expected_retval)
File "/root/vpp/build-root/rpmbuild/vpp-18.07.1/test/vpp_papi_provider.py", line 160, in api
reply = api_fn(**api_args)
File "build/bdist.linux-arch/egg/vpp_papi/vpp_papi.py", line 106, in __call__
return self._func(**kwargs)
File "build/bdist.linux-arch/egg/vpp_papi/vpp_papi.py", line 397, in f
return self._call_vpp(i, msg, multipart, **kwargs)
File "build/bdist.linux-arch/egg/vpp_papi/vpp_papi.py", line 604, in _call_vpp
msg = self._read()
File "build/bdist.linux-arch/egg/vpp_papi/vpp_papi.py", line 442, in _read
raise IOError(rv, 'vac_read failed')
IOError: [Errno -1] vac_read failed
3）此时应该通过执行 make test-shell DEBUG=gdb，进入测试框架提供的 shell 环境，如下所示：
[root@bogon vpp-18.07.1]# make test-shell DEBUG=gdb
...
(virtualenv) [root@bogon test]#
(virtualenv) [root@bogon test]#
然后单独执行那个报错的测试用例，比如：test_acl_plugin.py：
(virtualenv) [root@bogon test]# python test_acl_plugin.py
...
------------------------------------------------------------------------------
You can debug the VPP using e.g.:
gdb /root/vpp/build-root/rpmbuild/vpp-18.07.1/build-root/install-vpp-native/vpp/bin/vpp -ex 'attach 1880693'
Now is the time to attach a gdb by running the above command and set up breakpoints etc.
------------------------------------------------------------------------------
Press ENTER to continue running the testcase...
执行上述命令后，程序会停下来，根据上面的提示，可通过 gdb attach 来调试上述测试用例在执行过程中启动的 vpp 实例，在你认为有问题的地方打上断点，并?continue，如下所示：
[root@bogon vpp-18.07.1]# gdb /root/vpp/build-root/rpmbuild/vpp-18.07.1/build-root/install-vpp-native/vpp/bin/vpp -ex 'attach 1880693'
...
Reading symbols from /root/vpp/build-root/rpmbuild/vpp-18.07.1/build-root/install-vpp-native/vpp/bin/vpp...done.
Attaching to program: /root/vpp/build-root/rpmbuild/vpp-18.07.1/build-root/install-vpp-native/vpp/bin/vpp, process 2483450
[New LWP 2483451]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x000000fff67d65d4 in epoll_pwait () from /lib64/libc.so.6
(gdb) b vnet_classify_new_table
Breakpoint 1 at 0xfff6dcef90: file /root/vpp/build-root/rpmbuild/vpp-18.07.1/build-data/../src/vnet/classify/vnet_classify.c, line 128.
(gdb) c
Continuing.
4）在刚才启动的测试用例中敲回车，以便让测试用例继续执行，在 gdb 中命中断点后就可以进行调试了。
You can debug the VPP using e.g.:
gdb /root/vpp/build-root/rpmbuild/vpp-18.07.1/build-root/install-vpp-native/vpp/bin/vpp -ex 'attach 1880693'
Now is the time to attach a gdb by running the above command and set up breakpoints etc.
------------------------------------------------------------------------------
Press ENTER to continue running the testcase...
==============================================================================
ACL plugin Test Case
==============================================================================
Starting ACL plugin version check; learn MACs ...
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ACL plugin version check; learn MACs OK
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Starting ACL create/delete test ...
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