Hi Mark,
Here is my toplevel "run" script which I run from cygwin, from the parent of the git clone'd asdf/ directory.
I commented all the ASDF_TEST_LISPS for windows so as to leave only abcl.
You should just have to edit the line
export ABCL=...
to match the location of your abcl executable (yes, if you're running through cygwin, then you can use the bare "abcl" executable, which itself is a shell script and will be handled properly, as long as "java" is in the execution path of the cygwin bash shell).
When you run this "run" script, it will create
asdf-windows/
directory to do the actual testing. If you run on MacOS and/or Linux it will make similarly named subdirectories; this allows hypothetically running the tests in parallel on several virtual machines from the same shared parent directory.
Regards and Happy Holidays,
Dave