Merge branch 'ab/test-quoting-fix' into maint

Fixes for tests when the source directory has unusual characters in its path, e.g. whitespaces, double-quotes, etc. source: <cover-v2-0.3-00000000000-20220630T101646Z-avarab@gmail.com> * ab/test-quoting-fix: config tests: fix harmless but broken "rm -r" cleanup test-lib.sh: fix prepend_var() quoting issue tests: add missing double quotes to included library paths