Add --keep-tmp flag to test script

tests/entrypoint.sh

@@ -4,19 +4,24 @@ REGEXS=()
 
 while [[ $# -gt 0 ]]; do
   case $1 in
-    -v|--verbose)
-      VERBOSE=1
-      shift
-      ;;
     -h|--help)
         cat <<EOF
 USAGE: [flags] [test regexs...]
 FLAGS
+    --keep-tmp
     --verbose (-v)
     --help    (-h)
 EOF
       exit 1
       ;;
+    -v|--verbose)
+      VERBOSE=1
+      shift
+      ;;
+    --keep-tmp)
+      KEEP_TMP=1
+      shift
+      ;;
     *)
       REGEXS+=("$1")
       shift
@@ -29,7 +34,7 @@ cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null
 root=$(pwd)
 
 TMPDIR="$(mktemp --tmpdir -d isle-tests.XXXXXX)"
-trap 'rm -rf $TMPDIR' EXIT
+if [ -z "$KEEP_TMP" ]; then trap 'rm -rf $TMPDIR' EXIT; fi
 
 export TMPDIR
 echo "tmp dir is $TMPDIR"