/usr/libexec/installed-tests/pango/test-no-fonts fails due to missing font config

root@qemux86-64:/usr/lib/pango/ptest# /usr/libexec/installed-tests/pango/test-no-fonts
# random seed: R02S4fb07525c7cfdafffcd082963ed52[   82.507238] traps: test-no-fonts[2109] trap int3 ip:7f472b4a6c17 sp:7ffd78213d20 error:0 in libglib-2.0.so.0.7200.3[7f472b469000+8b000]
fdb
Bail out! FATAL-ERROR: Failed to parse fontconfig configuration

** (/usr/libexec/installed-tests/pango/test-no-fonts:2109): ERROR **: 18:41:19.187: Failed to parse fontconfig configuration

strace reveals:

openat(AT_FDCWD, "/usr/libexec/installed-tests/pango/nofonts/fonts.conf", O_RDONLY) = -1 ENOENT (No such file or directory)