tests: use the input file's absolute path with tests using input files
tests: use the input file's absolute path with tests using input files

Otherwise out-of-tree builds fail to run those tests.

Signed-off-by: Josef 'Jeff' Sipek <a620f141433c70aa9e43778305a6c68cbfadfb25@josefsipek.net>

jeffpc/libjeffpc,jeffpc/libjeffpc,jeffpc/libjeffpc,jeffpc/libjeffpc