tests: README: updates README

tests/README

@@ -1,57 +1,33 @@
-The testing suite contains two main trees (plus translations for strings used in
-the shell scripts): the Bonsai tree and the POSIX tree:
+The testing suite contains two trees: the Bonsai tree and the POSIX tree:
 
 .
-├── bonsai
-│   ├── test_env
-│   ├── dj.sh
-│   ├── false.sh
-│   ├── fop.sh
-│   ├── hru.sh
-│   ├── intcmp.sh
-│   ├── mm.sh
-│   ├── strcmp.sh
-│   └── true.sh
-├── locales
-│   ├── en_US.UTF-8
-│   └── tok
-├── posix
-│   ├── bin
-│   │   ├── cat
-│   │   ├── false
-│   │   └── true
-│   └── posix_env
 ├── README
-└── test.sh
+├── bonsai/
+│   ├── dj.mk
+│   ├── false.mk
+│   ├── fop.mk
+│   └── ...
+├── posix/
+└── tests.mk
 
 The Bonsai tree tests the functionality of Harakit utilities for regressions and
 other issues relating to compliance to our standards of practice.
 
-The POSIX tree tests the use of Harakit utilities in place of the standard usage
-of POSIX utilities. These scripts test the ability of Harakit to comply to POSIX
-standards using its native utilities in shell scripts as a compatibility shim.
-Each shell script in the top directory should contain a set of tests for each
-POSIX utility and be named for that utility. The bin directory should contain
-a set of shim scripts which will be imported into the path as POSIX utilities.
-Each test will compare the behavior of the shim script to the real utility on
-the system.
+The POSIX tests are currently a work-in-progress. Their status in this
+repository is uncertain.
 
-Currently, due to the limitations of POSIX shell quoting, a subset of argument
-parsing is supported: arguments containing characters from POSIX’s Portable
-Filename Character Set [0].
+Both sets of tests also inherit the environment set by the top-level Makefile,
+which sets the BIN variable to the build/bin directory at the root of the
+project; therefore, each binary is located at $(BIN)/tool for idiomatic access.
 
-The bonsai/test_env and posix/posix_env files contain prerequisite shared
-environments for each of the tests. These scripts both contain lines which set
-the shell to write all commands run in them (-x) and to fail if any command
-fails (-e). See set(1p) for more information.
+Each test contains a set of PHONY targets which are prefixed with the name of
+the tool being tested and an underscore. The first target is tests, which
+depends on all the other targets in the test file. These test files are each
+included in the top Makefile, so they can be called from the root of the
+repository. This also means that BIN can be set manually so that tests can be
+run using make(1) inside of the tests directory:
 
-Both sets of tests also inherit the environment set by the test.sh script, which
-sets the $BIN environment variable to the bin directory at the root of the
-project for easy and idiomatic access to the built Harakit binaries. When
-calling the POSIX test scripts, test.sh also sets the variable $realutil to be
-the absolute path to the currently tested utility’s counterpart on the system.
-
-[0] <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_282>
+	$ make -f tests.mk BIN=../build/bin dj_tests
 
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 Copyright © 2024 Emma Tebibyte <emma@tebibyte.media>