* test/lisp/vc/vc-tests/vc-tests.el
(vc-test--run-maybe-unsupported-function): Remove dummy branch in
`condition-case`.
* test/lisp/arc-mode-tests.el (define-arc-mode-test-on-type):
Use `error-slot-value`.

* test/src/process-tests.el (process-tests--ignore-EMFILE):
* test/src/filelock-tests.el (filelock-tests-unlock-spoiled)
(filelock-tests-kill-buffer-spoiled):
* test/lisp/vc/vc-git-tests.el (vc-git-test--run):
* test/lisp/proced-tests.el (proced--assert-process-valid-cpu-refinement):
* test/lisp/emacs-lisp/pp-tests.el (pp-tests--sanity):
* test/lisp/emacs-lisp/edebug-tests.el (edebug-tests-with-normal-env)
(edebug-tests-post-command):
* test/lisp/autorevert-tests.el (auto-revert--deftest-remote):
* test/infra/android/test-controller.el (ats-connect):

* test/Makefile.in: Distinguish between parallel and not-parallel
tests.  Mark lisp/autorevert-tests.log, lisp/filenotify-tests.log
and lisp/net/tramp-tests.log to run not-parrallel.  (Bug#80164)

* test/README: Some of the tests do not run parallel when
expensive tests are activated.

* test/infra/gitlab-ci.yml (.job-template): Use "make -j".
Makefile knows how to handle parallel runs properly.

* test/infra/gitlab-ci.yml (.job-template):
* test/README: Don't use "make -j".

* lisp/filenotify.el (file-notify--rm-descriptor):
Use `insert-special-event'.

* lisp/net/tramp-sh.el (tramp-bundle-read-file-names): Fix docstring.
(tramp-sh-gio-monitor-process-filter): Extend error strings.

* test/infra/Dockerfile.emba (emacs-base): Install python3.

* test/lisp/filenotify-tests.el (auto-revert-buffer-list): Declare.
(file-notify--test-rootdir): New defvar.  Replace all uses of
`temporary-file-directory' by it.
(file-notify--test-cleanup): Set `auto-revert-buffer-list' to nil.
(file-notify--test-monitor): Check also for `process-live-p'.
Skip test, if the monitor cannot be determined.
(file-notify--deftest-remote): Do not call
`tramp-cleanup-connection', this is done in
`file-notify--test-cleanup' already.
(with-file-notify-test): New defmacro.  Use it in (almost) all tests.
(file-notify--test-make-temp-name): Do not create
`file-notify--test-tmpdir'.
(file-notify--test-event-handler): Use `directory-file-name '.
(auto-revert-debug): Set it to nil.
(file-notify-test<nn>-*): Rewrite, using `with-file-notify-test'
and `ert-with-temp-file'.

* test/lisp/net/tramp-tests.el (tramp-test46-file-notifications):
Tag it :unstable.

* test/infra/gitlab-ci.yml (.filenotify-gio-template): Enable also
for scheduled jobs.

* test/lisp/filenotify-tests.el (file-notify--test-cleanup):
Fix docstring.
(file-notify--deftest-remote): Use `file-notify--test-cleanup'.
(file-notify-test03-events, file-notify-test05-file-validity)
(file-notify-test06-dir-validity)
(file-notify-test07-many-events)
(file-notify-test09-watched-file-in-watched-dir): Adapt tests.
(file-notify-test03-events-remote)
(file-notify-test04-autorevert-remote)
(file-notify-test07-many-events-remote)
(file-notify-test09-watched-file-in-watched-dir-remote): Do not
tag as :unstable.