tests: bring README up to date

tests/README.rst

@@ -1,31 +1,86 @@
 .. SPDX-License-Identifier: GPL-3.0-or-later
 
+Tests
+=====
+
+The following is a non-comprehensitve lists of various tests that can be found
+in this repo.
+
 Unit tests
-==========
+----------
 
-The unit tests depend on cmocka_.
+The unit tests depend on cmocka_ and can easily be executed after compilation.
+They are enabled by default.
 
 .. code-block:: bash
 
-	$ make check
+        $ meson test -C build_dir --suite unit
+
+Config tests
+------------
+
+Config tests utilize the kresd's lua config file to execute arbitrary tests,
+typically testing various modules, their API etc.
+
+These tests require installed kresd. The binary ``kresd`` found in ``$PATH``
+will be tested. When testing through meson, ``$PATH`` is modified automatically
+and you just need to make sure to install kresd first.
 
-.. todo:: Writing tests.
+To enable these tests, specify ``-Dconfig_tests=enabled`` option for meson.
+Multiple dependencies are required (refer to meson's output when configuring
+the build dir).
+
+.. code-block:: bash
+
+        $ meson configure build_dir -Dconfig_tests=enabled
+        $ ninja install -C build_dir
+        $ meson test -C build_dir --suite config
 
 Integration tests
-=================
+-----------------
+
+The integration tests are using Deckard, the `DNS test harness <deckard>`_. The
+tests simulate specific DNS scenarios, including authoritative server and their
+responses.
+
+These tests require installed kresd. The binary ``kresd`` found in ``$PATH``
+will be tested. When testing through meson, ``$PATH`` is modified automatically
+and you just need to make sure to install kresd first.
+
+To enable these tests, specify ``-Dextra_tests=enabled`` option for meson.
+Multiple dependencies are required (refer to meson's output when configuring
+the build dir).
+
+Enabling ``extra_tests`` automatically enables config tests as well.
+
+.. code-block:: bash
+
+        $ meson configure build_dir -Dextra_tests=enabled
+        $ ninja install -C build_dir
+        $ meson test -C build_dir --suite integration
+
+Pytests
+-------
+
+The pytest suite is designed to spin up a kresd instance, acquire a connected
+socket, and then performs any tests on it. These tests are used to test for
+example TCP, TLS and its connection management.
+
+These tests require installed kresd. The binary ``kresd`` found in ``$PATH``
+will be tested. When testing through meson, ``$PATH`` is modified automatically
+and you just need to make sure to install kresd first.
 
-The integration tests are using Deckard, the `DNS test harness <deckard>`_.
-It requires Jinja2_ and Python, `socket_wrapper`_, libfaketime_ are embedded in the build (cmake is required for `socket_wrapper`_).
+To enable these tests, specify ``-Dextra_tests=enabled`` option for meson.
+Multiple dependencies are required (refer to meson's output when configuring
+the build dir).
 
-Execute the tests by:
+Enabling ``extra_tests`` automatically enables config tests as well.
 
 .. code-block:: bash
 
-	$ make check-integration
+        $ meson configure build_dir -Dextra_tests=enabled
+        $ ninja install -C build_dir
+        $ meson test -C build_dir --suite pytests
 
-See deckard_ documentation on how to write additional tests.
 
-.. _cmocka: https://cmocka.org/
-.. _`socket_wrapper`: https://cwrap.org/socket_wrapper.html
-.. _`libfaketime`: https://github.com/wolfcw/libfaketime
 .. _deckard: https://gitlab.nic.cz/knot/deckard