On release 6.4.23, running test test/runAllTests_batch.praat hangs at test test/fon/resamplingDepth.praat.
It prints ./fon/resamplingDepth.praat and and then does nothing. It waits infinity.
After I have commented out command Play to ;Play in test/runAllTests_batch.praat, the tests continue and have finished successful.
I am using Fedora 40.