Unit tests don't remove test directory

[torwig]

Search before asking

• [X] I had searched in the issues and found no similar issues.

Version

Kvrocks version: the latest unstable e4ae784a271b4d815eb3a015e27c6f6e296b3036 OS: Fedora 35

Minimal reproduce step

Build and run unit tests by executing ./unittest

What did you expect to see?

Deletion of the testdb folder at the end of unit tests.

What did you see instead?

Directory testdb exists, because rmdir function (https://github.com/apache/incubator-kvrocks/blob/unstable/tests/cppunit/test_base.h#L41) is unable to remove a non-empty directory.

Anything Else?

Directory compactdb also exists after unit tests have finished. If there were a function to traverse the content of a directory removing files and folders recursively, it would be applied to compactdb as well.

Are you willing to submit a PR?

• [ ] I'm willing to submit a PR!

[git-hulk]

We didn't have the recursive delete directory yet.