It seems that at least Perl 5.24.1, if the parameter of 'do' (which we
use to read the configuration file) is relative patch that does not start
with ./, the file is only searched in Perl @INC path. This results in
test failure, because our configuration file in not in @INC.
echo '$test_c = 2;' > dir/c
echo '$test_c = 1;' > dir/b # Overriden by the 'c' file
echo '$test_ign=1;' > dir/b.txt # Ignored
-WVPASS sh -c 'NOVABOOT_CONFIG_DIR=dir novaboot --dump-config > config'
+WVPASS sh -c 'NOVABOOT_CONFIG_DIR=./dir novaboot --dump-config > config'
WVPASS sh -c 'grep \$test config > test'
WVPASS diff -u - test <<'EOF'
$test_a = 1;