diff --git a/test/runtestcases.sh b/test/runtestcases.sh
index 3d736630..40f60db9 100755
--- a/test/runtestcases.sh
+++ b/test/runtestcases.sh
@@ -1,15 +1,15 @@
 #!/bin/bash
 
 cmd=$1
-dir=$2
+dir=${2:-.}
 
 if test -z "$cmd" -o -z "$dir"; then
-  echo "Usage: runtestcases <cmd> <dir>";
+  echo "Usage: runtestcases <cmd> [dir]";
   exit 1
 fi
 
 ex=0
-for tc in $(find $dir -name \*.t) ; do
+for tc in $(find $dir -name \*.t | sort) ; do
   $cmd $tc >/dev/null
   tex=$?
   tcn="${tc#$dir/} .................................................."