diff --git a/.github/workflows/docker-test.yml b/.github/workflows/docker-test.yml
index 0d11f65..fa4008a 100644
--- a/.github/workflows/docker-test.yml
+++ b/.github/workflows/docker-test.yml
@@ -49,4 +49,7 @@ jobs:
           load: true
       -
         name: Test
-        run: bash tests/test.sh
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y p7zip-full
+          bash tests/test.sh
diff --git a/tests/fixtures/source/bitwarden/data/config.json b/tests/fixtures/source/bitwarden/data/config.json
new file mode 100644
index 0000000..0967ef4
--- /dev/null
+++ b/tests/fixtures/source/bitwarden/data/config.json
@@ -0,0 +1 @@
+{}
diff --git a/tests/test.sh b/tests/test.sh
index c78be77..f474224 100644
--- a/tests/test.sh
+++ b/tests/test.sh
@@ -1,3 +1,35 @@
 #!/bin/bash
 
+
+DOCKER_IMAGE="ttionya/vaultwarden-backup:test"
+ERROR_NUM=0
+
+OUTPUT_DIR="outputs"
+REMOTE_DIR="/${OUTPUT_DIR}"
+
+########################################
+# Print colorful message.
+# Arguments:
+#     color
+#     message
+# Outputs:
+#     colorful message
+########################################
+function color() {
+    case $1 in
+        red)     echo -e "\033[31m$2\033[0m" ;;
+        green)   echo -e "\033[32m$2\033[0m" ;;
+        yellow)  echo -e "\033[33m$2\033[0m" ;;
+        blue)    echo -e "\033[34m$2\033[0m" ;;
+        none)    echo "$2" ;;
+    esac
+}
+
 . tests/units/backup-zip-file/test.sh
+
+if [[ "${ERROR_NUM}" == "0" ]]; then
+    color green "All tests passed."
+else
+    color red "Some tests failed."
+    exit 1
+fi
diff --git a/tests/units/backup-zip-file/test.sh b/tests/units/backup-zip-file/test.sh
index 2b64fff..bdae056 100644
--- a/tests/units/backup-zip-file/test.sh
+++ b/tests/units/backup-zip-file/test.sh
@@ -1,13 +1,40 @@
 #!/bin/bash
 
-echo "Test backup-zip-file"
+TEST_NAME="backup-zip-file"
+TEST_OUTPUT_DIR="$(pwd)/${OUTPUTS_DIR}/${TEST_NAME}"
 
-mkdir -p outputs/backup-zip-file
+PASSWORD="71ad8764-2f69-4c0c-8452-61e08b9f489d"
 
-docker run --rm \
-  --mount type=bind,source=$(pwd)/outputs/backup-zip-file,target=/outputs \
-  -e RCLONE_REMOTE_DIR=/outputs \
-  ttionya/vaultwarden-backup:test \
-  backup
+color blue "Testing the ${TEST_NAME} unit..."
 
-ls -l outputs/backup-zip-file
+function prepare() {
+    mkdir -p "${TEST_OUTPUT_DIR}"
+}
+
+function start() {
+    docker run --rm \
+        --mount "type=bind,source=${TEST_OUTPUT_DIR},target=${REMOTE_DIR}" \
+        -e "RCLONE_REMOTE_DIR=${REMOTE_DIR}" \
+        -e "ZIP_PASSWORD=${PASSWORD}" \
+        -e "BACKUP_FILE_SUFFIX=test" \
+        "${DOCKER_IMAGE}" \
+        backup
+}
+
+function test() {
+    color blue "Starting the test..."
+
+    local BACKUP_FILE="${TEST_OUTPUT_DIR}/backup.test.zip"
+
+    ls -l "${BACKUP_FILE}"
+    if [[ -s "${BACKUP_FILE}" ]]; then
+        color red "Error"
+        ((ERROR_NUM++))
+    fi
+
+    7z l -p"${PASSWORD}" "${BACKUP_FILE}"
+}
+
+prepare
+start
+test