### _Why are the changes needed?_
only change testing.md
### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [x] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#2487 from gabrywu/fixTestingMd.
Closes#2487
3c648a7e [gabrywu] fix module test command
7c6d1df0 [gabrywu] fix Running Tests Fully command
0582b6ec [gabrywu] fix test command to make it runnable
Authored-by: gabrywu <gabrywu@apache.org>
Signed-off-by: Fei Wang <fwang12@ebay.com>