The files in this directory are called by autopkgtest in the debian package but can be used by any packager to verify installed packages. Each test-* script should be run from the top of the source tree and takes an empty directory as its single argument. The test passes if the script exits with a zero exit status. Note that these tests write to stderr because they use set -x in the shell.
On a GNU/Linux system, you can run ./pkg-test/run-all from the top-level directory to run all the tests. Note that you have to specify an altrenative install prefix rather than using DESTDIR since, otherwise, pkg-config won't find the packages. For example:
cmake -S . -B build \
-DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=/tmp/inst
cmake --build build -j$(nproc)
cmake --install build
env PKG_CONFIG_PATH=/tmp/inst/lib/pkgconfig \
LD_LIBRARY_PATH=/tmp/inst/lib \
CMAKE_PREFIX_PATH=/tmp/inst \
PATH=/tmp/inst/bin:$PATH \
./pkg-test/run-all