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+src/tests: The FreeBSD test suite
+=================================
+
+This file describes the build infrastructure of the FreeBSD test suite.
+If you are only interested in using the test suite itself, please refer
+to tests(7) instead.
+
+The build of the test suite is organized in the following manner:
+
+* The build of all test artifacts is protected by the MK_TESTS knob.
+ The user can disable these with the WITHOUT_TESTS setting in
+ src.conf(5).
+
+* The goal for /usr/tests/ (the installed test programs) is to follow
+ the same hierarchy as /usr/src/ wherever possible, which in turn drives
+ several of the design decisions described below. This simplifies the
+ discoverability of tests. We want a mapping such as:
+
+ /usr/src/bin/cp/ -> /usr/tests/bin/cp/
+ /usr/src/lib/libc/ -> /usr/tests/lib/libc/
+ /usr/src/usr.bin/cut/ -> /usr/tests/usr.bin/cut/
+ ... and many more ...
+
+* Test programs for specific utilities and libraries are located next
+ to the source code of such programs. For example, the tests for the
+ src/lib/libcrypt/ library live in src/lib/libcrypt/tests/. The tests/
+ subdirectory is optional and should, in general, be avoided.
+
+* The src/tests/ hierarchy (this directory) provides generic test
+ infrastructure and glue code to join all test programs together into
+ a single test suite definition.
+
+* The src/tests/ hierarchy also includes cross-functional test programs:
+ i.e. test programs that cover more than a single utility or library
+ and thus don't fit anywhere else in the tree. Consider this to follow
+ the same rationale as src/share/man/: this directory contains generic
+ manual pages while the manual pages that are specific to individual
+ tools or libraries live next to the source code.
+
+In order to keep the src/tests/ hierarchy decoupled from the actual test
+programs being installed --which is a worthy goal because it simplifies
+the addition of new test programs and simplifies the maintenance of the
+tree-- the top-level Kyuafile does not know which subdirectories may
+exist upfront. Instead, such Kyuafile automatically detects, at
+run-time, which */Kyuafile files exist and uses those directly.
+
+Similarly, every category subdirectory within src/tests/ provides the
+same Kyuafile with auto-discovery features. For example: src/tests/lib/
+holds a generic Makefile to install test-suite related material but such
+directory does not know upfront which libraries within src/lib/ will
+install tests. For this reason, the Kyuafile in src/tests/lib/ has to
+also use the auto-discovery features. The same applies for any other
+category subdirectory (e.g. bin, usr.sbin, etc.).
+
+--
+$FreeBSD$