add tests cleaning

tests-ng/helpers

@@ -3,6 +3,31 @@
 #
 # file to be sourced from test scripts
 #
+# for i in *.sh; do ./$i >/dev/null 2>&1; find /tmp/ -maxdepth 1 -type f -iname 'tmp*' >> /tmp/$i.log; find /tmp/ -maxdepth 1 -type d -iname 'tmp.*-dotdrop-tests' >> /tmp/$i.log; find /tmp/ -maxdepth 1 -type d  -iname 'dotdrop-*' >> /tmp/$i.log; wc -l /tmp/$i.log; [ "`wc -l /tmp/$i.log | awk '{print $1}'`" -gt "0" ] && break; done
+
+declare -a to_be_cleared
+
+# add a file/directory to be cleared
+# on exit
+#
+# $1: file path to clear
+clear_on_exit()
+{
+  local len="${#to_be_cleared[*]}"
+  to_be_cleared[${len}]="$1"
+  if [ "${len}" = "0" ]; then
+    # set trap
+    trap on_exit EXIT
+  fi
+}
+
+# clear files
+on_exit()
+{
+  for i in "${to_be_cleared[@]}"; do
+    rm -rf "${i}"
+  done
+}
 
 # create a directory with sub-dirs and file
 # for tests