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+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+Packaging tests
+===============
+
+Packaging tests used pytest, docker and each directory with subdirectory *.packaging*
+is called as *component*.
+
+Run tests for all components:
+
+.. code-block::
+
+  pytest -r fEsxX tests/packaging
+
+List all components:
+
+.. code-block::
+
+  pytest tests/packaging --collect-only
+
+Run test for specific component (*doc/.packaging*):
+
+.. code-block::
+
+  pytest -r fEsxX tests/packaging -k test_collect[debian_10-doc/.packaging]
+
+.. note::
+
+	For debug add argument :code:`-s`.
+
+daemon/.packaging component
+---------------------------
+
+This is special component that is used by all others components.
+For each distribution and version are created two docker images with this component.
+One with building dependencies and one for running dependencies.
+*Build docker image* is tagged as :code:`kr-packaging-tests-<distro><version>-build`
+and *Run docker image* is tagged as :code:`kr-packaging-tests-<distro><version>-run`.
+
+Others components
+-----------------
+
+All others components are based on *daemon/.packaging* component (docker image).
+When component needs new building dependencies, new running dependencies
+or some scripts that change build or run phase (see `File structure of each component`_),
+new docker image is created.
+*Build docker image* is tagged as :code:`kr-packaging-tests-<distro><version>-<component>-build`
+and *Run docker image* is tagged as :code:`kr-packaging-tests-<distro><version>-<component>-run`.
+
+File structure of each component
+------------------------------------
+
+* <distro>
+  * <version>
+    * builddeps - list of build depedencies
+    * rundeps - list of runtime depedencies
+    * pre-build.sh - script called before build phase
+    * post-build.sh - script called after build phase
+    * pre-run.sh - script called before run phase
+    * post-run.sh - script called after run phase
+    * install.sh and build.sh - scripts to rewrite standard commands for building and instaling knot-resolvers
+    * pre-test.sh - script called immediately before testing
+* test.config or test.sh - kresd config test or shell script (one of them must exists)
+
+Commands order to create docker image
+-------------------------------------
+
+For *build docker image*:
+
+#. run pre-build.sh
+#. install packages specifed in the file *builddeps*
+#. run build.sh
+#. run install.sh
+#. run post-build.sh
+
+For *run docker image*:
+
+#. run pre-run.sh
+#. install packages specifed in the file *rundeps*
+#. run pre-test.sh
+#. run test (:code:`kresd -c test.config` or :code:`test.sh`)
+#. run post-build.sh
+
+
+.. note::
+
+  knot-resolver builded in *build docker image* is automatically moved to *run docker image*.