--- test-driver.bak	2019-01-23 03:22:06.672283432 +0100
+++ test-driver	2019-01-23 04:23:21.201060757 +0100
@@ -106,7 +106,10 @@
 trap "st=143; $do_exit" 15

 # Test script is run here.
-"$@" >$log_file 2>&1
+case "$1" in
+  *.sh) sh "$@" >$log_file 2>&1 ;;
+  *)    "$@" >$log_file 2>&1 ;;
+esac
 estatus=$?

 if test $enable_hard_errors = no && test $estatus -eq 99; then