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+.. 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. These can be enabled by the build system.
+
+Unit tests
+~~~~~~~~~~
+
+The unit tests depend on cmocka_ and can easily be executed after compilation.
+They are enabled by default (if ``cmocka`` is found).
+
+.. code-block:: bash
+
+        $ ninja -C build_dir
+        $ meson test -C build_dir --suite unit
+
+Postinstall tests
+~~~~~~~~~~~~~~~~~
+
+There following tests require a working installation of 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.
+
+.. code-block:: bash
+
+        $ ninja install -C build_dir
+
+Config tests
+~~~~~~~~~~~~
+
+Config tests utilize the kresd's lua config file to execute arbitrary tests,
+typically testing various modules, their API etc.
+
+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
+
+Extra tests
+~~~~~~~~~~~
+
+The extra tests require a large set of additional dependencies and executing
+them outside of upstream development is probably redundant.
+
+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.
+
+**Integration tests**
+
+The integration tests are using Deckard, the `DNS test harness
+<https://gitlab.nic.cz/knot/deckard>`_. The tests simulate specific DNS
+scenarios, including authoritative server and their responses. These tests rely
+on linux namespaces, refer to Deckard documentation for more info.
+
+.. 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.
+
+.. code-block:: bash
+
+        $ meson configure build_dir -Dextra_tests=enabled
+        $ ninja install -C build_dir
+        $ meson test -C build_dir --suite pytests
+
+Useful meson commands
+~~~~~~~~~~~~~~~~~~~~~
+
+It's possible to run only specific test suite or a test.
+
+.. code-block:: bash
+
+   $ meson test -C build_dir --help
+   $ meson test -C build_dir --list
+   $ meson test -C build_dir --no-suite postinstall
+   $ meson test -C build_dir integration.serve_stale