diff --git a/tests-ng/install.sh b/tests-ng/install.sh
new file mode 100755
index 0000000..16afa60
--- /dev/null
+++ b/tests-ng/install.sh
@@ -0,0 +1,127 @@
+#!/usr/bin/env bash
+# author: deadc0de6 (https://github.com/deadc0de6)
+# Copyright (c) 2020, deadc0de6
+#
+# test install
+# returns 1 in case of error
+#
+
+# exit on first error
+set -e
+
+# all this crap to get current path
+rl="readlink -f"
+if ! ${rl} "${0}" >/dev/null 2>&1; then
+  rl="realpath"
+
+  if ! hash ${rl}; then
+    echo "\"${rl}\" not found !" && exit 1
+  fi
+fi
+cur=$(dirname "$(${rl} "${0}")")
+
+#hash dotdrop >/dev/null 2>&1
+#[ "$?" != "0" ] && echo "install dotdrop to run tests" && exit 1
+
+#echo "called with ${1}"
+
+# dotdrop path can be pass as argument
+ddpath="${cur}/../"
+[ "${1}" != "" ] && ddpath="${1}"
+[ ! -d ${ddpath} ] && echo "ddpath \"${ddpath}\" is not a directory" && exit 1
+
+export PYTHONPATH="${ddpath}:${PYTHONPATH}"
+bin="python3 -m dotdrop.dotdrop"
+hash coverage 2>/dev/null && bin="coverage run -a --source=dotdrop -m dotdrop.dotdrop" || true
+
+echo "dotdrop path: ${ddpath}"
+echo "pythonpath: ${PYTHONPATH}"
+
+# get the helpers
+source ${cur}/helpers
+
+echo -e "$(tput setaf 6)==> RUNNING $(basename $BASH_SOURCE) <==$(tput sgr0)"
+
+################################################################
+# this is the test
+################################################################
+
+get_file_mode()
+{
+  u=`umask`
+  u=`echo ${u} | sed 's/^0*//'`
+  v=$((666 - u))
+  echo "${v}"
+}
+
+# $1 path
+# $2 rights
+has_rights()
+{
+  echo "testing ${1} is ${2}"
+  [ ! -e "$1" ] && echo "`basename $1` does not exist" && exit 1
+  local mode=`stat -L -c '%a' "$1"`
+  [ "${mode}" != "$2" ] && echo "bad mode for `basename $1` (${mode} VS expected ${2})" && exit 1
+  true
+}
+
+# dotdrop directory
+basedir=`mktemp -d --suffix='-dotdrop-tests' || mktemp -d`
+mkdir -p ${basedir}/dotfiles
+echo "[+] dotdrop dir: ${basedir}"
+echo "[+] dotpath dir: ${basedir}/dotfiles"
+tmpd=`mktemp -d --suffix='-dotdrop-tests' || mktemp -d`
+
+echo "content" > ${basedir}/dotfiles/x
+
+# create the config file
+cfg="${basedir}/config.yaml"
+cat > ${cfg} << _EOF
+config:
+  backup: true
+  create: true
+  dotpath: dotfiles
+dotfiles:
+  f_x:
+    src: x
+    dst: ${tmpd}/x
+profiles:
+  p1:
+    dotfiles:
+    - f_x
+_EOF
+
+echo "[+] install"
+cd ${ddpath} | ${bin} install -c ${cfg} -f -p p1 --verbose | grep '^1 dotfile(s) installed.$'
+[ "$?" != "0" ] && exit 1
+
+[ ! -e ${tmpd}/x ] && echo "f_x not installed" && exit 1
+
+# update chmod
+chmod 666 ${tmpd}/x
+cd ${ddpath} | ${bin} update -c ${cfg} -f -p p1 --verbose ${tmpd}/x
+
+# chmod updated
+cat ${cfg} | grep "chmod: '666'"
+
+chmod 644 ${tmpd}/x
+
+mode=`get_file_mode ${tmpd}/x`
+echo "[+] re-install with no"
+cd ${ddpath} | printf "N\n" | ${bin} install -c ${cfg} -p p1 --verbose
+[ "$?" != "0" ] && exit 1
+
+# if user answers N, chmod should not be done
+has_rights "${tmpd}/x" "${mode}"
+
+echo "[+] re-install with yes"
+cd ${ddpath} | printf "y\n" | ${bin} install -c ${cfg} -p p1 --verbose
+[ "$?" != "0" ] && exit 1
+
+has_rights "${tmpd}/x" "666"
+
+## CLEANING
+rm -rf ${basedir} ${tmpd}
+
+echo "OK"
+exit 0