Currently the python unit test framework expects to find extension modules under the libtool build path '.libs'. CMake doesn't export its built libraries under a '.libs' sub-directory.

e.g.

CMake

ext/compressors/snappy/libwiredtiger_snappy.so

Libtool:

ext/compressors/snappy/.libs/libwiredtiger_snappy.so

Update the python unit test framework to also detect the library outside of the '.libs' sub-directory.