diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..d57593d
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,2 @@
+dotenv_if_exists .mod_env
+
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dd3547b..c348e52 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,8 +7,8 @@ default:
     - apk --no-cache add bash
 
 stages:
-  - test
   - build
+  - test
   - release
 
 variables:
diff --git a/.mod_env b/.mod_env
new file mode 100644
index 0000000..3b92f05
--- /dev/null
+++ b/.mod_env
@@ -0,0 +1,4 @@
+CURRENT_MOD=test_harness
+DEPENDENCIES=[{ "url":"https://github.com/minetest/minetest_game/archive/refs/heads/master.tar.gz", "path":"/usr/local/share/minetest/games/minetest", "strip":1 }]
+MINETEST_ADD_CONF=
+CLIENT_NB=1
\ No newline at end of file
diff --git a/.util/.mod_env.tmpl b/.util/.mod_env.tmpl
new file mode 100644
index 0000000..c1f539a
--- /dev/null
+++ b/.util/.mod_env.tmpl
@@ -0,0 +1,4 @@
+CURRENT_MOD=test_harness
+CLIENT_NB=1
+DEPENDENCIES=[{ "url":"https://github.com/minetest/minetest_game/archive/refs/heads/master.tar.gz", "path":"/usr/local/share/minetest/games/minetest", "strip":1 }, { "url":"https://forge.apps.education.fr/iri/minetest/docker_test_harness/-/archive/main/docker_test_harness-main.tar.gz", "path":"/usr/local/share/minetest/games/minetest/mods/test_harness", "strip":1 }]
+MINETEST_ADD_CONF=
\ No newline at end of file
diff --git a/.util/Dockerfile b/.util/Dockerfile
index bd5e215..286d155 100644
--- a/.util/Dockerfile
+++ b/.util/Dockerfile
@@ -1,7 +1,7 @@
-FROM curlimages/curl:latest as dl_base
+# 
 
-# list of mods and game to download
-RUN mkdir -p minetest_game && curl -s -L https://github.com/minetest/minetest_game/archive/refs/heads/master.tar.gz | tar zxvf - -C minetest_game --strip-components=1
+ARG DEPENDENCIES
+ARG MINETEST_ADD_CONF=""
 
 FROM ghcr.io/minetest/minetest:latest as builder
 
@@ -9,17 +9,24 @@ ENV STOP_SERVER=true
 ENV FAILFAST=false
 ENV MINETEST_GAME_PATH=/usr/local/share/minetest/games
 ENV SHOW_DEBUG=false
-
+ENV CURRENT_MOD="test_harness"
+ENV ADDITIONAL_MODS=""
 
 USER root
 
 RUN mkdir -p /usr/local/share/minetest/games && \
-    apk add --no-cache bash
+    apk add --no-cache bash curl jq
 
 # WORKDIR /config/.minetest/games/devtest/mods
-
-# Copy from the dl base the game and mods to their correct path in the game or mod folders
-COPY --from=dl_base /home/curl_user/minetest_game /usr/local/share/minetest/games/minetest
+RUN <<EOF
+while read dep; do
+    url=$(echo "$dep" | jq -r ".url")
+    dep_path=$(echo "$dep" | jq -r ".path")
+    strip=$(echo "$dep" | jq -r ".strip // 1")
+    echo "Download $url to $dep_path with strip=$strip"
+    mkdir -p "$dep_path" && curl -s -L "$url" | tar zxf - -C "$dep_path" --strip-components="$strip"
+done < <(echo "$DEPENDENCIES" | jq -c '.[]')
+EOF
 
 COPY <<"EOF" /usr/local/sbin/run_minetest
 #!/usr/bin/env bash
@@ -39,6 +46,7 @@ function clean_up {
 
 rm -f /etc/minetest/minetest.conf
 cat /etc/minetest/minetest.conf.base - <<-EOT > /etc/minetest/minetest.conf
+    test_harness_mods=${CURRENT_MOD}${ADDITIONAL_MODS}
     test_harness_stop_server=${STOP_SERVER}
     test_harness_failfast=${FAILFAST}
 EOT
@@ -66,7 +74,6 @@ EOF
 
 # Customize the test_harness_mods value to list the mods to test. Empty value means all, including the test harness itself
 COPY <<-EOF /etc/minetest/minetest.conf.base
-    test_harness_mods=test_harness
     test_harness_run_tests=true
     max_forceloaded_blocks=9999
     name=admin
@@ -79,6 +86,7 @@ COPY <<-EOF /etc/minetest/minetest.conf.base
     water_level=-2
     mgflat_ground_level=-1
     mg_flags=nocaves,nodungeons,nolight,nodecorations,nobiomes,noores
+    ${MINETEST_ADD_CONF}
 EOF
 
 RUN chown -R minetest:minetest /var/lib/minetest/.minetest /usr/local/sbin/run_minetest && \
diff --git a/.util/docker-compose.yaml b/.util/docker-compose.yaml
index bc580d4..4aca421 100644
--- a/.util/docker-compose.yaml
+++ b/.util/docker-compose.yaml
@@ -4,23 +4,17 @@ services:
     restart: "no"
     build:
       dockerfile: Dockerfile
+      args:
+        DEPENDENCIES: "${DEPENDENCIES}"
+        MINETEST_ADD_CONF: "${MINETEST_ADD_CONF:-}"
     ports:
       - "30000:30000/udp"
     volumes:
-      - "$PWD:/usr/local/share/minetest/games/minetest/mods/test_harness"
+      - "$PWD:/usr/local/share/minetest/games/minetest/mods/${CURRENT_MOD}"
     environment:
       SHOW_DEBUG: ${SHOW_DEBUG}
       RUN_TESTS: ${RUN_TESTS}
       STOP_SERVER: ${STOP_SERVER}
       FAILFAST: ${FAILFAST}
-  client1:
-    image: ${CLIENT_IMAGE}
-    restart: on-failure:10
-    depends_on:
-      - "server"
-    environment:
-      SERVER: server
-      PORT: 30000
-      PLAYERNAME: player1
-      RANDOM_INPUT: 0
-      PASSWORD: test
\ No newline at end of file
+      CURRENT_MOD: "${CURRENT_MOD}"
+      ADDITIONAL_MODS: "${ADDITIONAL_MODS:-}"
diff --git a/.util/run_tests.sh b/.util/run_tests.sh
index e8929a4..609cc2a 100755
--- a/.util/run_tests.sh
+++ b/.util/run_tests.sh
@@ -7,25 +7,32 @@ script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)
 
 usage() {
   cat <<EOF
-Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-D] [-f/--failfast] [-k/--keep-server] [-i/--image docker_image] [-p/--port port_server]
+Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-D] [-f/--failfast] [-k/--keep-server] [-p/--port port_server] [--dependencies mod_dependencies] [-c/--clients nb_of_client]
 
 Start tests.
 
 Available options:
 
 -h, --help         Print this help and exit
+-d, --docker-cmd   The container engine (docker or podman)
+--podman           Use podman as container engine
+--docker           Use docker as container engine
 -D, --show-debug   Display debug.txt content on exit
 -f, --failfast     Failfast tests
 -k, --keep-server  Keep the server running
--i, --image        Pass the image to use for the tests
 -p, --port         Server port
+-c, --clients      Number of client, default to \$CLIENT_NB
+--dependencies     mod dependencies
 EOF
   exit
 }
 
 cleanup() {
   trap - SIGINT SIGTERM ERR EXIT
-  eval $docker_cmd compose -f "${script_dir}/docker-compose.yaml" down
+  eval $docker_cmd compose -f "${docker_compose_file}" down
+  if [-f "${docker_compose_file:-}" ]; then
+    \rm  "${docker_compose_file}"
+  fi
 }
 
 setup_colors() {
@@ -64,18 +71,18 @@ isuint() { [[ $1 == +([0-9]) ]] ;}
 
 docker_cmd=
 docker_build_cmd="build"
-docker_image=
 client_image=
-client_nb=0
+client_nb=${CLIENT_NB:-1}
 failfast="false"
 stop_server="true"
 server_port="30000"
 show_debug="false"
 run_tests="all"
+dependencies="${DEPENDENCIES:-}"
 
 parse_params() {
   # init switch flags
-  args=$(getopt -a -o Dfhki:c:p:d:t: --long show-debug,failfast,keep-server,help,podman,docker,image:,client:,client-image:,port:,docker-cmd:,tests: -- "$@")
+  args=$(getopt -a -o Dfhkc:p:d:t: --long show-debug,failfast,keep-server,help,podman,docker,clients:,client-image:,port:,docker-cmd:,tests:,dependencies: -- "$@")
   if [[ $? -gt 0 ]]; then
     usage
   fi
@@ -119,18 +126,18 @@ parse_params() {
       run_tests=$2
       shift 2
       ;;
-    -i | --image)
-      docker_image=$2
-      shift 2
-      ;;
     --client-image)
       client_image=$2
       shift 2
       ;;
-    -c | --client)
+    -c | --clients)
       client_nb=$2
       shift 2
       ;;
+    --dependencies)
+      dependencies=$2
+      shift 2
+      ;;
     # -- means the end of the arguments; drop this, and break out of the while loop
     --)
       shift
@@ -187,17 +194,45 @@ vol=(
 [ -d minetest_game ] && vol+=(
   -v "$PWD/minetest_game":/var/lib/minetest/.minetest/games/minetest_game
 )
-echo "docker_image: |$docker_image|"
 export SHOW_DEBUG=${show_debug:-false}
 export RUN_TESTS=${run_tests}
 export STOP_SERVER="${stop_server:-true}"
 export FAILFAST="${failfast:-false}"
-export CLIENT_IMAGE="${client_image:-registry.apps.education.fr/iri/minetest/docker-test-harness/client:latest}"
+export DEPENDENCIES="${dependencies}"
+export CLIENT_IMAGE="${client_image:-registry.apps.education.fr/iri/minetest/docker_test_harness/client:latest}"
+if [ -z "$($docker_cmd images -q $CLIENT_IMAGE 2> /dev/null)" ]; then
+  die "CLIENT IMAGE $CLIENT_IMAGE does not exists"
+fi
+export ENV_FILE=""
+if [ -f "$PWD/.mod_env" ]; then
+  ENV_FILE="--env-file \"$PWD/.mod_env\""
+fi
 
-eval $docker_cmd compose -f "${script_dir}/docker-compose.yaml" down
-eval $docker_cmd compose -f "${script_dir}/docker-compose.yaml" pull
-eval $docker_cmd compose -f "${script_dir}/docker-compose.yaml" build --pull
-eval $docker_cmd compose -f "${script_dir}/docker-compose.yaml" up --force-recreate --exit-code-from server --abort-on-container-exit
+docker_compose_file=`mktemp --suffix=.yaml docker-composeXXXXXX`
+
+cat "${script_dir}/docker-compose.yaml" > $docker_compose_file
+for (( clienti=1; clienti<=$client_nb; clienti++ )); do
+  cat <<EOF >> $docker_compose_file
+  client${clienti}:
+    image: \${CLIENT_IMAGE}
+    restart: on-failure:10
+    depends_on:
+      - "server"
+    environment:
+      SERVER: server
+      PORT: 30000
+      PLAYERNAME: player${clienti}
+      RANDOM_INPUT: 0
+      PASSWORD: test
+EOF
+
+done
+
+
+eval $docker_cmd compose $ENV_FILE -f "${$docker_compose_file}" down
+eval $docker_cmd compose $ENV_FILE -f "${$docker_compose_file}" pull
+eval $docker_cmd compose $ENV_FILE -f "${$docker_compose_file}" build --pull
+eval $docker_cmd compose $ENV_FILE -f "${$docker_compose_file}" up --force-recreate --exit-code-from server --abort-on-container-exit
 exit_code=$?
 
 exit $exit_code
\ No newline at end of file
diff --git a/README.md b/README.md
index 8e594d0..041256e 100644
--- a/README.md
+++ b/README.md
@@ -21,30 +21,24 @@ The tests are run using Docker or Podman. Therefor you'll need to have either on
 This mod's goal is to provide a test framework for implementing tests for minetest mods.
 
 1. Declare `test_harness` as an optional dependencies for your mod
-2. Clone or download the `docker-test-harness` mod.
-3. Place the `test_harness` directory into the `mods` folder of your Minetest world.
-4. copy the `.util` folder in your project
-5. Customize the `.util/Dockerfile` to include the mods and game your project depends on (download and copy)
-6. Customize the `.util/Dockerfile` to adapt the `/etc/minetest/minetest.conf.base` file to list the mods you want to test (`test_harness_mods`), and to adjust the server configuration to your project test settings.
-7. Do not forget the following setting in `/etc/minetest/minetest.conf.base` to enable automatic test execution:/etc/minetest/minetest.conf.base
-    ```ini
-    test_harness_run_tests = true
-    ```
-8. In your source files (in the `init.lua` for example) add the following lines (or equivalent)
+2. copy the `.util` folder in your project
+3. copy the `.util/.mod_env.tmpl` to `.mod_env` at the root of your folder.
+4. adapt its content. Do not remove the test_harness dependency definition.
+5. if necessary, customize the `.util/Dockerfile` to adapt the `/etc/minetest/minetest.conf.base` file to list the mods you want to test (`test_harness_mods`), and to adjust the server configuration to your project test settings.
+6. In your source files (in the `init.lua` for example) add the following lines (or equivalent)
     ```lua
     if minetest.settings:get_bool("test_harness_run_tests", false) then
 	    dofile(minetest.get_modpath("my_mod").. "/test/init.lua")
     end
     ```
-9. In your test file(s), get an instance of the method allowing the registration of your tests:
+7. In your test file(s), get an instance of the method allowing the registration of your tests:
    ```lua
    local register_test = test_harness.get_test_registrator("my_mod", my_mod.version_string)
    ```
-10. Register the test by calling `register_test`
-11. Adapt the `.util/docker-compose.yaml` to declare all the client intances with their players needed by your tests
-12. Run the test by lauching the `run_tests.sh` script. For example with Podman
+8.  Register the test by calling `register_test`
+9.  Run the test by lauching the `run_tests.sh` script. For example with Podman
     ```shell
-    $ .util/run_tests.sh --podman
+    $ .util/run_tests.sh --podman -c 1
     ```
     See the available options with `.util/run_tests.sh --help`
 
diff --git a/client/Dockerfile b/client/Dockerfile
index d41598b..aa2478f 100644
--- a/client/Dockerfile
+++ b/client/Dockerfile
@@ -1,4 +1,4 @@
-ARG OPENGL_BASE_IMAGE="registry.apps.education.fr/iri/minetest/docker-test-harness/opengl:latest"
+ARG OPENGL_BASE_IMAGE="registry.apps.education.fr/iri/minetest/docker_test_harness/opengl:latest"
 FROM alpine:latest AS compile
 
 ARG MINETEST_VERSION=5.9.1