* testing/lisp/test-ob-C.el:
* testing/lisp/test-ob-awk.el:
* testing/lisp/test-ob-sed.el: Add missing provide.
* testing/lisp/test-property-inheritance.el: Fix incorrect feature
name.
* testing/org-test.el (org-test-load): Use `require' instead of
`load-file' to load tests. `load-file' can lead to duplicate test
definitions that now trigger ERC errors.
See https://lists.gnu.org/archive/html/bug-gnu-emacs/2021-11/msg01968.html