Added tests/README.md

tests/README.md

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+Tests
+=====
+
+Lint
+----
+
+<https://github.com/pyllyukko/harden.yml/actions/workflows/lint.yml>
+
+Linting with:
+
+* [ansible-lint](https://github.com/marketplace/actions/run-ansible-lint)
+* `yamllint`
+* `ansible-playbook --syntax-check`
+
+Molecule
+--------
+
+Molecule is ran against [Debian](https://hub.docker.com/_/debian), [Slackware](https://hub.docker.com/r/pyllyukko/slackware) & [Kali](https://www.kali.org/docs/containers/official-kalilinux-docker-images/) Docker images.
+
+### Limitations
+
+* Certain hardenings like `kernel` & `network` are not tested
+* Debian-based containers do not have systemd, so anything related to systemd can't be tested
+
+ShellCheck
+----------
+
+<https://github.com/pyllyukko/harden.yml/actions/workflows/shellcheck.yml>
+
+[ShellCheck](https://www.shellcheck.net/) is ran against few scripts.
+
+PAM
+---
+
+<https://github.com/pyllyukko/harden.yml/actions/workflows/pam.yml>
+
+The following PAM tests are executed:
+
+* Various tests with [pamtester](https://pamtester.sourceforge.net/)
+* Various tests with [libpamtest](https://cwrap.org/pam_wrapper.html) (cwrap)
+    * See [#61](https://github.com/pyllyukko/harden.yml/issues/61)
+* Tracking few upstream PAM configurations for changes in case we need to adapt/react to some change
+
+### Limitations
+
+Anything `auth` can't be tested with `pamtester`, because there's no way to enter password with `pamtester` (hence the additional tests with [libpamtest](https://cwrap.org/pam_wrapper.html)).
+
+ca-certs
+--------
+
+<https://github.com/pyllyukko/harden.yml/actions/workflows/ca-certs.yml>
+
+* Check that all certificates in [ca-certificates.conf.new](https://github.com/pyllyukko/harden.yml/blob/master/newconfs/ca-certificates.conf.new) still exist
+* Make a limited amount of TLS connection tests against various hosts to see that the limited CA list works as expected (see [test\_ca-certs.sh](https://github.com/pyllyukko/harden.yml/blob/master/tests/test_ca-certs.sh))
+* Test the CRL download functionality (`make crls`)
+
+### Limitations
+
+The `ca-certs` package in the [GitHub Ubuntu runner](https://github.com/actions/runner-images?tab=readme-ov-file#available-images) doesn't seem to be updated as often as in Slackware.