diff --git a/.gitignore b/.gitignore
index ffe8346..853efb4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 /tests/coverage/
 /node_modules/
 /repository/
+/.bin/
diff --git a/plugin.yaml b/plugin.yaml
index 665e6fe..044e6d6 100644
--- a/plugin.yaml
+++ b/plugin.yaml
@@ -4,9 +4,15 @@ usage: 'Repeatable configuration scheme for Helm Charts'
 description: 'This plugin provides a convenient way to manage a set of configuration scheme'
 useTunnel: false
 command: '$HELM_PLUGIN_DIR/scripts/run.sh'
+
+hooks:
+  install: '$HELM_PLUGIN_DIR/scripts/wrapper/run.cmd $HELM_PLUGIN_DIR/scripts/install.sh'
+  update: '$HELM_PLUGIN_DIR/scripts/wrapper/run.cmd $HELM_PLUGIN_DIR/scripts/install.sh'
+
 platformCommand:
   - os: windows
     command: 'cmd /c $HELM_PLUGIN_DIR/scripts/wrapper/sh.cmd $HELM_PLUGIN_DIR/scripts/run.sh'
+
 downloaders:
   - command: 'scripts/run.sh downloader'
     protocols:
diff --git a/scripts/commands/downloader.sh b/scripts/commands/downloader.sh
new file mode 100644
index 0000000..c37ccba
--- /dev/null
+++ b/scripts/commands/downloader.sh
@@ -0,0 +1,72 @@
+#!/usr/bin/env sh
+
+set -eu
+
+# Create temporary directory
+TMP_DIR="${HELM_CONFIG_SCHEME_TMP_DIR:-$(mktemp -d)}"
+
+YQ_PATH="${HELM_PLUGIN_DIR}/.bin/"
+
+_trap_hook() {
+    unset_subst_args
+    rm -rf "${TMP_DIR}"
+}
+
+_yq() {
+    if [ -f "${YQ_PATH}/yq" ]; then
+        "${YQ_PATH}/yq" "$@"
+    else
+        "${YQ_PATH}/yq.exe" "$@"
+    fi
+}
+
+downloader() {
+    if [ $# -ne 2 ]; then
+        log_error "[downloader] Not able to download config, missing args"
+        exit 2
+    fi
+    uri="${1}"
+    parent_process_cmd_line="${2}"
+
+    case "${uri}" in
+    "config://"*) ;;
+
+    *)
+        log_error "[downloader] URI '${uri}' not supported"
+        exit 2
+        ;;
+    esac
+
+    scheme_name=$(printf '%s' "${uri}" | sed 's!config://!!')
+
+    if ! repository_scheme_exists "${scheme_name}"; then
+        log_error "[downloader] Scheme '${scheme_name}' doesn't exists"
+        exit 2
+    fi
+
+    # build parameters
+    export_subst_args "${parent_process_cmd_line}"
+
+    idx=0
+    repository_view_scheme "${scheme_name}" | while read -r file_template; do
+        log_info "[downloader] Looking for '${file_template}'..."
+
+        eval "file=${file_template}"
+        # shellcheck disable=SC2154
+        file_content="$( (_file_get "${file}" || printf ''))"
+
+        if [ -z "${file_content}" ]; then
+            log_info "[downloader] Ignored config source : ${file}"
+        else
+            log_info "[downloader] Loaded config source : ${file}"
+            printf '%s\n' "${file_content}" >"${TMP_DIR}/file-${idx}"
+            idx=$((idx + 1))
+        fi
+    done
+
+    if [ "$(find "${TMP_DIR}" -type f | wc -l)" -le 1 ]; then
+        cat "${TMP_DIR}/file-0" 2>/dev/null || printf ''
+    else
+        _yq merge -x "${TMP_DIR}"/file-*
+    fi
+}
diff --git a/scripts/install.sh b/scripts/install.sh
new file mode 100755
index 0000000..473349b
--- /dev/null
+++ b/scripts/install.sh
@@ -0,0 +1,101 @@
+#!/usr/bin/env sh
+
+set -eu
+
+# Path to current directory
+SCRIPT_DIR="$(dirname "$0")"
+
+if [ "$(uname)" = "Darwin" ]; then
+    if ! command -v realpath >/dev/null; then
+        brew install coreutils
+    fi
+fi
+
+YQ_PATH="${HELM_PLUGIN_DIR}/.bin/"
+mkdir -p "${YQ_PATH}"
+
+YQ_DEFAULT_VERSION="3.4.1"
+YQ_VERSION="${YQ_VERSION:-"${YQ_DEFAULT_VERSION}"}"
+
+YQ_PLATFORM="windows"
+if [ "$(uname)" = "Darwin" ]; then
+    YQ_PLATFORM="darwin"
+elif [ "$(uname)" = "Linux" ]; then
+    YQ_PLATFORM="linux"
+fi
+
+YQ_ARCH="386"
+if [ "$(uname -m)" = "x86_64" ]; then
+    YQ_ARCH="amd64"
+fi
+
+YQ_SUFFIX=""
+if [ "${YQ_PLATFORM}" = "windows" ]; then
+    YQ_SUFFIX=".exe"
+fi
+
+YQ_URL="${YQ_URL:-"https://github.com/mikefarah/yq/releases/download/${YQ_VERSION}/yq_${YQ_PLATFORM}_${YQ_ARCH}${YQ_SUFFIX}"}"
+
+# shellcheck disable=SC2034
+YQ_SHA_darwin_amd64="5553d4640550debed5213a5eb6016d3a3485ca8a36e9c71996610280755d5a50"
+# shellcheck disable=SC2034
+YQ_SHA_linux_368="ba57700f41cf21bf019af0eec47cf9884f70c25bc5abb0f3347bd42f19609739"
+# shellcheck disable=SC2034
+YQ_SHA_linux_amd64="adbc6dd027607718ac74ceac15f74115ac1f3caef68babfb73246929d4ffb23c"
+# shellcheck disable=SC2034
+YQ_SHA_windows_368="6292e14b0c199f2bd33e18a8bfe67f100084837163e1e2bc4934bcd7990a5087"
+# shellcheck disable=SC2034
+YQ_SHA_windows_amd64="987d31d3a9b75f9cb0f202173aab033d333d2406ba2caa7dba9d16a5204c2167"
+
+YQ_SHA_DEFAULT_NAME="YQ_SHA_${YQ_PLATFORM}_${YQ_ARCH}"
+eval YQ_SHA_DEFAULT="\$${YQ_SHA_DEFAULT_NAME}"
+YQ_SHA="${YQ_SHA:-"${YQ_SHA_DEFAULT}"}"
+
+RED='\033[0;31m'
+NOC='\033[0m'
+
+get_sha_256() {
+    if [ ! -f "${1}" ]; then
+        res=''
+    elif command -v sha256sum >/dev/null; then
+        res=$(sha256sum "$1")
+    elif command -v shasum >/dev/null; then
+        res=$(shasum -a 256 "$1")
+    else
+        res=''
+    fi
+
+    echo "$res" | cut -d ' ' -f 1
+}
+
+# shellcheck source=scripts/lib/http.sh
+. "${SCRIPT_DIR}/lib/http.sh"
+
+if [ -n "${SKIP_YQ_INSTALL+x}" ] && [ "${SKIP_YQ_INSTALL}" = "true" ]; then
+    echo "Skipping yq installation."
+    exit 0
+fi
+
+YQ_SHA256="$(get_sha_256 "${YQ_PATH}")"
+
+if [ "${YQ_SHA256}" != "${YQ_SHA}" ] || [ "${YQ_SHA256}" = "" ]; then
+    echo "Installing/Upgrading yq dependency..."
+
+    if ! download "${YQ_URL}" >/tmp/yq; then
+        printf "${RED}%s${NOC}\n" "Can't download yq ..."
+        exit 1
+    fi
+
+    YQ_SHA256="$(get_sha_256 /tmp/yq)"
+    if [ "${YQ_SHA256}" = "${YQ_SHA}" ] || [ "${YQ_SHA256}" = "" ]; then
+        chmod +x /tmp/yq
+        mv /tmp/yq "${YQ_PATH}/yq${YQ_SUFFIX}"
+    else
+        printf "${RED}%s${NOC}\n" "Checksum mismatch : expected ${YQ_SHA} but was ${YQ_SHA256}"
+        if [ "${YQ_VERSION}" != "${YQ_DEFAULT_VERSION}" ]; then
+            printf "${RED}%s${NOC}\n" "Forgot to set YQ_SHA?"
+        fi
+        echo "Ignoring ..."
+    fi
+    rm -f /tmp/yq
+fi
diff --git a/scripts/lib/file.sh b/scripts/lib/file.sh
new file mode 100644
index 0000000..c5ff983
--- /dev/null
+++ b/scripts/lib/file.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env sh
+
+set -eu
+
+# shellcheck source=scripts/lib/file/local.sh
+. "${SCRIPT_DIR}/lib/file/local.sh"
+
+# shellcheck source=scripts/lib/file/custom.sh
+. "${SCRIPT_DIR}/lib/file/custom.sh"
+
+_file_get_protocol() {
+    case "$1" in
+    *://*)
+        echo "custom"
+        ;;
+    *)
+        echo "local"
+        ;;
+    esac
+}
+
+_file_get() {
+    file_type=$(_file_get_protocol "${1}")
+
+    _file_"${file_type}"_get "$@"
+}
diff --git a/scripts/lib/file/custom.sh b/scripts/lib/file/custom.sh
new file mode 100644
index 0000000..ae2e69a
--- /dev/null
+++ b/scripts/lib/file/custom.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env sh
+
+_file_custom_get() {
+    helm template "${SCRIPT_DIR}/lib/file/helm-values-getter" -f "${1}" |
+        sed -E -e "s/^# Source: .+$//" -e "s/^---$//"
+}
diff --git a/scripts/lib/file/helm-values-getter/Chart.yaml b/scripts/lib/file/helm-values-getter/Chart.yaml
new file mode 100644
index 0000000..fea58ff
--- /dev/null
+++ b/scripts/lib/file/helm-values-getter/Chart.yaml
@@ -0,0 +1,3 @@
+apiVersion: v2
+name: helm-values-getter
+version: 1.0.0
diff --git a/scripts/lib/file/helm-values-getter/templates/values.yaml b/scripts/lib/file/helm-values-getter/templates/values.yaml
new file mode 100644
index 0000000..4bdbf9d
--- /dev/null
+++ b/scripts/lib/file/helm-values-getter/templates/values.yaml
@@ -0,0 +1 @@
+{{- .Values | toYaml -}}
diff --git a/scripts/lib/file/local.sh b/scripts/lib/file/local.sh
new file mode 100644
index 0000000..421a8b1
--- /dev/null
+++ b/scripts/lib/file/local.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+set -eu
+
+_file_local_get() {
+    cat "${1}" 2>/dev/null
+}
diff --git a/scripts/lib/file_uri_substitution.sh b/scripts/lib/file_uri_substitution.sh
index 1455f9c..ff46eb3 100644
--- a/scripts/lib/file_uri_substitution.sh
+++ b/scripts/lib/file_uri_substitution.sh
@@ -36,3 +36,151 @@ file_uri_subst() {
 
     echo "${file_uri}" | sed 's/{{/${/g' | sed 's/}}/}/g'
 }
+
+unset_subst_args() {
+    unset namespace chart release
+}
+
+export_subst_args() {
+    # shellcheck disable=SC2034
+    export namespace="${HELM_NAMESPACE:-unknown}"
+    # shellcheck disable=SC2034
+    export chart="CHART-NAME"
+    # shellcheck disable=SC2034
+    export release="RELEASE-NAME"
+    # shellcheck disable=SC2086
+    _get_subst_args_value ${1}
+
+    # Refine chart value
+    if [ -d "${chart}" ]; then
+        chart="$(realpath "${chart}")"
+    fi
+    chart="$(basename "${chart}")"
+    # Remove Semver
+    chart="$(echo "${chart}" | sed -E 's/(.+)-[0-9]+\.[0-9]+\.[0-9]+(-.+)?/\1/')"
+    # Remove ext
+    chart="${chart%%.*}"
+
+    log_info "[substitution] Args namespace=${namespace}, chart=${chart}, release=${release}"
+}
+
+_get_subst_args_value() {
+    args=""
+
+    # Remove all flags, and put all args into var
+    i=1
+    while [ "$i" -le "$#" ]; do
+        eval "arg=\${$i}"
+        # shellcheck disable=SC2154
+        is_flag="$(_is_helm_flag "${arg}")"
+
+        if [ "${is_flag}" -gt 0 ]; then
+            i=$((i + is_flag))
+        else
+            args="${args} ${arg}"
+            i=$((i + 1))
+        fi
+    done
+
+    log_info "[substitution] analyzing arguments $args"
+    # shellcheck disable=SC2086
+    set -- $args
+
+    while [ $# -gt 0 ]; do
+        case "${1:-}" in
+        lint)
+            return
+            ;;
+        template)
+            if [ $# -ge 3 ]; then
+                release="${2}"
+                chart="${3}"
+            else
+                chart="${2}"
+            fi
+            return
+            ;;
+        install | upgrade)
+            release="${2}"
+            chart="${3}"
+            return
+            ;;
+        esac
+        shift
+    done
+}
+
+_is_helm_flag() {
+    case "${1:-}" in
+    # Global Flags :: Key, Value
+    --repository-config | --repository-cache | --registry-config | -n | --namespace | \
+        --kubeconfig | --kube-token | --kube-context | --kube-as-user | --kube-as-group | \
+        --kube-apiserver)
+        echo 2
+        ;;
+    # Global Flags :: Key
+    -h | --help | --debug)
+        echo 1
+        ;;
+    # Value Options Flags https://github.com/helm/helm/blob/master/cmd/helm/flags.go#L41
+    -f | --values | --set | --set-string | --set-file)
+        echo 2
+        ;;
+    # ChartPathOptionsFlags https://github.com/helm/helm/blob/master/cmd/helm/flags.go#L48
+    --version | --keyring | --repo | --username | --password | --cert-file | --key-file | --ca-file)
+        echo 2
+        ;;
+    --verify | --insecure-skip-tls-verify)
+        echo 1
+        ;;
+    # https://github.com/helm/helm/blob/master/cmd/helm/flags.go#L63
+    -o | --output | --post-renderer)
+        echo 2
+        ;;
+    # Lint flags
+    --strict | --with-subcharts)
+        echo 1
+        ;;
+    # Install Flags
+    --create-namespace | --dry-run | --no-hooks | --replace | --wait | --devel | \
+        --dependency-update | --disable-openapi-validation | --atomic | --skip-crds | \
+        --render-subchart-notes)
+        echo 1
+        ;;
+    --timeout | --description)
+        echo 2
+        ;;
+    -g | --generate-name)
+        log_error " Unable to proceed repeatable configuration with a generated name"
+        return 2
+        ;;
+    --name-template)
+        log_error " name-template flag is not supported"
+        return 2
+        ;;
+    # Template Flags
+    -s | --show-only | --output-dir | --api-versions | --release-name)
+        echo 2
+        ;;
+    --validate | --include-crds | --is-upgrade)
+        echo 1
+        ;;
+    # Upgrade Flags
+    --history-max)
+        # Already existing
+        # --timeout | --description
+        echo 2
+        ;;
+    -i | --install | --recreate-pods | --force | --reset-values | \
+        --reuse-values | --cleanup-on-fail)
+        # Already existing
+        # --create-namespace | --devel | --dry-run | --no-hooks |
+        # --disable-openapi-validation | --skip-crds |
+        # --wait | --atomic | --render-subchart-notes
+        echo 1
+        ;;
+    *)
+        echo 0
+        ;;
+    esac
+}
diff --git a/scripts/lib/http.sh b/scripts/lib/http.sh
new file mode 100644
index 0000000..201008c
--- /dev/null
+++ b/scripts/lib/http.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env sh
+
+download() {
+    if command -v curl >/dev/null; then
+        curl -sSfL "$1"
+    elif command -v wget >/dev/null; then
+        wget -q -O- "$1"
+    else
+        return 1
+    fi
+}
diff --git a/scripts/run.sh b/scripts/run.sh
index 378b82a..052e80c 100755
--- a/scripts/run.sh
+++ b/scripts/run.sh
@@ -20,6 +20,9 @@ HELM_BIN="${HELM_BIN:-helm}"
 # shellcheck source=scripts/lib/repository.sh
 . "${SCRIPT_DIR}/lib/repository.sh"
 
+# shellcheck source=scripts/lib/file.sh
+. "${SCRIPT_DIR}/lib/file.sh"
+
 _trap_hook() {
     true
 }
@@ -48,6 +51,20 @@ Configuration scheme usage with : 'config://<scheme-name>'
 EOF
 }
 
+_parent_process_command() {
+    if [ "$(uname)" = "Darwin" ]; then
+        ps -p "${PPID}" -o command=
+    elif [ "$(uname)" = "Linux" ]; then
+        if command -v apk >/dev/null; then
+            # alpine based
+            # shellcheck disable=SC2009
+            ps -o pid,args= | grep -E "^\s+${PPID}" | awk '!($1="")'
+        else
+            ps -p "${PPID}" -o command=
+        fi
+    fi
+}
+
 while true; do
     case "${1:-}" in
     add | edit | list | remove | view)
@@ -63,8 +80,20 @@ while true; do
         break
         ;;
     downloader)
-        log_error "Error: Not yet implemented."
-        exit 2
+        # command certFile keyFile caFile full-URL
+        if [ $# -le 4 ]; then
+            log_error "[downloader] invalid usage, please refer to https://helm.sh/docs/topics/plugins/#downloader-plugins"
+            exit 1
+        fi
+        # shellcheck source=scripts/commands/downloader.sh
+        . "${SCRIPT_DIR}/commands/downloader.sh"
+
+        # retrieve original helm command line
+        HELM_COMMAND="$(_parent_process_command)"
+
+        # It's always the 5th parameter
+        downloader "${5}" "${HELM_COMMAND}"
+        break
         ;;
     --help | -h | help)
         usage
diff --git a/tests/assets/.keep b/tests/assets/.keep
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/assets/CHART-NAME.yaml b/tests/assets/CHART-NAME.yaml
new file mode 100644
index 0000000..ab28e6a
--- /dev/null
+++ b/tests/assets/CHART-NAME.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    default/CHART-NAME.yaml: 'true'
diff --git a/tests/assets/RELEASE-NAME.yaml b/tests/assets/RELEASE-NAME.yaml
new file mode 100644
index 0000000..e090f69
--- /dev/null
+++ b/tests/assets/RELEASE-NAME.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    default/RELEASE-NAME.yaml: 'true'
diff --git a/tests/assets/chart.yaml b/tests/assets/chart.yaml
new file mode 100644
index 0000000..cda59b5
--- /dev/null
+++ b/tests/assets/chart.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    default/chart.yaml: 'true'
diff --git a/tests/assets/git.yaml b/tests/assets/git.yaml
new file mode 100644
index 0000000..7f620d0
--- /dev/null
+++ b/tests/assets/git.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    default/git.yaml: 'true'
diff --git a/tests/assets/my-release.yaml b/tests/assets/my-release.yaml
new file mode 100644
index 0000000..b439749
--- /dev/null
+++ b/tests/assets/my-release.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    default/my-release.yaml: 'true'
diff --git a/tests/assets/namespace/CHART-NAME.yaml b/tests/assets/namespace/CHART-NAME.yaml
new file mode 100644
index 0000000..17f4fb6
--- /dev/null
+++ b/tests/assets/namespace/CHART-NAME.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    ns/CHART-NAME.yaml: 'true'
diff --git a/tests/assets/namespace/RELEASE-NAME.yaml b/tests/assets/namespace/RELEASE-NAME.yaml
new file mode 100644
index 0000000..4e3f6d7
--- /dev/null
+++ b/tests/assets/namespace/RELEASE-NAME.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    ns/RELEASE-NAME.yaml: 'true'
diff --git a/tests/assets/namespace/chart.yaml b/tests/assets/namespace/chart.yaml
new file mode 100644
index 0000000..18fc12a
--- /dev/null
+++ b/tests/assets/namespace/chart.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    ns/chart.yaml: 'true'
diff --git a/tests/assets/namespace/git.yaml b/tests/assets/namespace/git.yaml
new file mode 100644
index 0000000..187ad6c
--- /dev/null
+++ b/tests/assets/namespace/git.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    ns/git.yaml: 'true'
diff --git a/tests/assets/namespace/my-release.yaml b/tests/assets/namespace/my-release.yaml
new file mode 100644
index 0000000..ce045a9
--- /dev/null
+++ b/tests/assets/namespace/my-release.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    ns/my-release.yaml: 'true'
diff --git a/tests/assets/namespace/test.yaml b/tests/assets/namespace/test.yaml
new file mode 100644
index 0000000..332d1cb
--- /dev/null
+++ b/tests/assets/namespace/test.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    ns/test.yaml: 'true'
diff --git a/tests/assets/namespace/values.yaml b/tests/assets/namespace/values.yaml
new file mode 100644
index 0000000..c7e4f3d
--- /dev/null
+++ b/tests/assets/namespace/values.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    ns/values.yaml: 'true'
diff --git a/tests/assets/test.yaml b/tests/assets/test.yaml
new file mode 100644
index 0000000..3deb2d7
--- /dev/null
+++ b/tests/assets/test.yaml
@@ -0,0 +1,3 @@
+ingress:
+  annotations:
+    default/test.yaml: 'true'
diff --git a/tests/assets/values.yaml b/tests/assets/values.yaml
new file mode 100644
index 0000000..32f1102
--- /dev/null
+++ b/tests/assets/values.yaml
@@ -0,0 +1,4 @@
+ingress:
+  enabled: true
+  annotations:
+    default/values.yaml: 'true'
diff --git a/tests/lib/assert-downloader.bash b/tests/lib/assert-downloader.bash
new file mode 100644
index 0000000..917113f
--- /dev/null
+++ b/tests/lib/assert-downloader.bash
@@ -0,0 +1,32 @@
+
+assert-downloader-output-base() {
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/rand-assets/values.yaml'..."
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/assets/values.yaml'..."
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/assets/\${chart}.yaml'..."
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/assets/\${release}.yaml'..."
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/assets/\${CUSTOM_ENV_VAR}.yaml'..."
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/assets/\${namespace}/values.yaml'..."
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/assets/\${namespace}/\${chart}.yaml'..."
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/assets/\${namespace}/\${release}.yaml'..."
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/assets/\${namespace}/\${CUSTOM_ENV_VAR}.yaml'..."
+
+    assert_file_not_exist "${HELM_CONFIG_SCHEME_TMP_DIR}"
+}
+
+assert-downloader-output() {
+    assert-downloader-output-base
+
+    namespace="${1}"
+    chart="${2}"
+    release="${3}"
+    env="${4}"
+    assert_output --partial "[config-scheme][downloader] Ignored config source : ${TEST_TEMP_DIR}/rand-assets/values.yaml"
+    assert_output --partial "[config-scheme][downloader] Loaded config source : ${TEST_TEMP_DIR}/assets/values.yaml"
+    assert_output --partial "[config-scheme][downloader] Loaded config source : ${TEST_TEMP_DIR}/assets/${chart}.yaml"
+    assert_output --partial "[config-scheme][downloader] Loaded config source : ${TEST_TEMP_DIR}/assets/${release}.yaml"
+    assert_output --partial "[config-scheme][downloader] Loaded config source : ${TEST_TEMP_DIR}/assets/${env}.yaml"
+    assert_output --partial "[config-scheme][downloader] Loaded config source : ${TEST_TEMP_DIR}/assets/${namespace}/values.yaml"
+    assert_output --partial "[config-scheme][downloader] Loaded config source : ${TEST_TEMP_DIR}/assets/${namespace}/${chart}.yaml"
+    assert_output --partial "[config-scheme][downloader] Loaded config source : ${TEST_TEMP_DIR}/assets/${namespace}/${release}.yaml"
+    assert_output --partial "[config-scheme][downloader] Loaded config source : ${TEST_TEMP_DIR}/assets/${namespace}/${env}.yaml"
+}
diff --git a/tests/lib/helper.bash b/tests/lib/helper.bash
index 75fba95..5708dba 100644
--- a/tests/lib/helper.bash
+++ b/tests/lib/helper.bash
@@ -38,6 +38,9 @@ setup() {
 
     # Use a temporary config-repository reseted after every suite
     export HELM_CONFIG_SCHEME_REPOSITORY="${TEST_TEMP_DIR}/config-repository"
+    export HELM_CONFIG_SCHEME_TMP_DIR="${TEST_TEMP_DIR}/config-tmp"
+
+    mkdir -p "${HELM_CONFIG_SCHEME_TMP_DIR}"
 
     # shellcheck disable=SC2034
     XDG_DATA_HOME="${HOME}"
@@ -48,7 +51,6 @@ setup() {
     APPDATA="${HOME}"
 
     # install helm plugin
-    helm_plugin_install git
     helm plugin install "${GIT_ROOT}"
 
     # copy .kube from real home
diff --git a/tests/unit/downloader.bats b/tests/unit/downloader.bats
index d0f3bf9..78354b8 100644
--- a/tests/unit/downloader.bats
+++ b/tests/unit/downloader.bats
@@ -4,9 +4,143 @@ load '../lib/helper'
 load '../bats/extensions/bats-support/load'
 load '../bats/extensions/bats-assert/load'
 load '../bats/extensions/bats-file/load'
+load '../lib/assert-downloader'
 
-@test "downloader:" {
+@test "downloader: invalid usage" {
     run helm config-scheme downloader
+    assert_failure 1
+    assert_output --partial '[config-scheme][downloader] invalid usage, please refer to'
+
+    run helm config-scheme downloader unused
+    assert_failure 1
+    assert_output --partial '[config-scheme][downloader] invalid usage, please refer to'
+
+    run helm config-scheme downloader unused unused
+    assert_failure 1
+    assert_output --partial '[config-scheme][downloader] invalid usage, please refer to'
+
+    run helm config-scheme downloader unused unused unused
+    assert_failure 1
+    assert_output --partial '[config-scheme][downloader] invalid usage, please refer to'
+}
+
+@test "downloader: not supported uri" {
+    run helm config-scheme downloader unused unused unused git://test
     assert_failure 2
-    assert_output --partial 'Error: Not yet implemented.'
+    assert_output --partial "[config-scheme][downloader] URI 'git://test' not supported"
+}
+
+@test "downloader: config scheme not found" {
+    run helm config-scheme downloader unused unused unused config://random
+    assert_failure 2
+    assert_output --partial "[config-scheme][downloader] Scheme 'random' doesn't exists"
+}
+
+@test "downloader: nominal one file in config" {
+    if is_windows; then
+        skip
+    fi
+
+    helm config-scheme add test "${TEST_TEMP_DIR}/assets/values.yaml"
+
+    run helm config-scheme downloader unused unused unused config://test -n namespace 2>&1
+    assert_success
+    assert_file_not_exist "${HELM_CONFIG_SCHEME_TMP_DIR}"
+    assert_output --partial "[config-scheme][downloader] Looking for '${TEST_TEMP_DIR}/assets/values.yaml'..."
+    assert_output --partial "[config-scheme][downloader] Loaded config source : ${TEST_TEMP_DIR}/assets/values.yaml"
+
+    assert_output --partial "$(cat <<-YAML
+ingress:
+  enabled: true
+  annotations:
+    default/values.yaml: 'true'
+YAML
+)"
+    refute_output --partial 'default/CHART-NAME.yaml:'
+    refute_output --partial 'default/my-chart.yaml:'
+    refute_output --partial 'default/RELEASE-NAME.yaml:'
+    refute_output --partial 'default/my-release.yaml:'
+    refute_output --partial 'default/test.yaml:'
+    refute_output --partial 'default/git.yaml:'
+    refute_output --partial 'ns/default.yaml:'
+    refute_output --partial 'ns/CHART-NAME.yaml:'
+    refute_output --partial 'ns/my-chart.yaml:'
+    refute_output --partial 'ns/RELEASE-NAME.yaml:'
+    refute_output --partial 'ns/my-release.yaml:'
+    refute_output --partial 'ns/test.yaml:'
+    refute_output --partial 'ns/git.yaml:'
+}
+
+@test "downloader: nominal only with local files" {
+    if is_windows; then
+        skip
+    fi
+
+    create_config_scheme test
+
+    run helm config-scheme downloader unused unused unused config://test -n namespace 2>&1
+    assert_success
+    assert-downloader-output "namespace" "CHART-NAME" "RELEASE-NAME" "test"
+
+    assert_output --partial "$(cat <<-YAML
+ingress:
+  enabled: true
+  annotations:
+    default/values.yaml: 'true'
+    default/CHART-NAME.yaml: 'true'
+    default/RELEASE-NAME.yaml: 'true'
+    default/test.yaml: 'true'
+    ns/values.yaml: 'true'
+    ns/CHART-NAME.yaml: 'true'
+    ns/RELEASE-NAME.yaml: 'true'
+    ns/test.yaml: 'true'
+YAML
+)"
+
+    refute_output --partial 'default/my-chart.yaml:'
+    refute_output --partial 'default/my-release.yaml:'
+    refute_output --partial 'default/git.yaml:'
+    refute_output --partial 'ns/my-chart.yaml:'
+    refute_output --partial 'ns/my-release.yaml:'
+    refute_output --partial 'ns/git.yaml:'
+
+}
+
+@test "downloader: nominal" {
+    if is_windows; then
+        skip
+    fi
+    helm_plugin_install git
+
+    create_config_scheme test
+    helm config-scheme edit test append \
+        "git+https://github.com/jBouyoud/helm-config-scheme@{{chart}}.yaml?ref=master" \
+        "git+https://github.com/jBouyoud/helm-config-scheme@tests/assets/git.yaml?ref=first-release" \
+        "git+https://github.com/jBouyoud/helm-config-scheme@tests/assets/{{namespace}}/git.yaml?ref=first-release"
+
+    run helm config-scheme downloader unused unused unused config://test -n namespace 2>&1
+    assert_success
+    assert-downloader-output "namespace" "CHART-NAME" "RELEASE-NAME" "test"
+
+    assert_output --partial "$(cat <<-YAML
+ingress:
+  enabled: true
+  annotations:
+    default/values.yaml: 'true'
+    default/CHART-NAME.yaml: 'true'
+    default/RELEASE-NAME.yaml: 'true'
+    default/test.yaml: 'true'
+    ns/values.yaml: 'true'
+    ns/CHART-NAME.yaml: 'true'
+    ns/RELEASE-NAME.yaml: 'true'
+    ns/test.yaml: 'true'
+    default/git.yaml: "true"
+    ns/git.yaml: "true"
+YAML
+)"
+
+    refute_output --partial 'default/my-chart.yaml:'
+    refute_output --partial 'default/my-release.yaml:'
+    refute_output --partial 'ns/my-chart.yaml:'
+    refute_output --partial 'ns/my-release.yaml:'
 }
diff --git a/tests/unit/help.bats b/tests/unit/help.bats
index 53bfd62..ec9c897 100755
--- a/tests/unit/help.bats
+++ b/tests/unit/help.bats
@@ -9,6 +9,12 @@ load '../bats/extensions/bats-file/load'
     run helm plugin list
     assert_success
     assert_output --partial 'config-scheme'
+
+    if is_windows; then
+        assert_file_exist ".bin/yq.exe"
+    else
+        assert_file_exist ".bin/yq"
+    fi
 }
 
 @test "help: helm config-scheme show help" {