diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000..86de785
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,23 @@
+variables:
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+
+cache:
+  paths:
+    - .cache/pip
+    - /var/venv/
+
+lint:
+  image: python:3.8-slim
+  stage: test
+  except:
+    - /^wip-.*$/
+    - /^old-.*$/
+    - pitchme
+  script:
+  - python -V
+  - apt-get update -qq && apt-get -qq -y install make python3-venv
+  - python3 -m venv /var/venv/
+  - source /var/venv/bin/activate
+  - pip install -r requirements-dev.txt
+  - make --no-print-directory --quiet lint
+  - make --no-print-directory --quiet test
diff --git a/Makefile b/Makefile
index a051a75..88b68fa 100644
--- a/Makefile
+++ b/Makefile
@@ -26,8 +26,11 @@ lint: # Lint code
 
 open_all: # Open all projects files
 	${EDITOR} ${VBIN}/activate
-	${EDITOR} main.py Makefile pyproject.toml README.md requirements-dev.txt requirements.txt
+	${EDITOR} .gitlab-ci.yml main.py Makefile pyproject.toml README.md requirements-dev.txt requirements.txt
 	${EDITOR} .git/hooks/p*-commit
 
 pre_commit: # Run the pre-commit hook
 	bash .git/hooks/pre-commit
+
+test: # Run the code tests
+	./main.py -h 1> /dev/null && echo ✅ || echo 🚨
diff --git a/main.py b/main.py
index 1e51466..0b7b426 100755
--- a/main.py
+++ b/main.py
@@ -12,6 +12,7 @@ This file is part of [`<GIT REPO NAME>`](<GIT REPO URL>)
 """
 
 import argparse
+from os import environ
 import sys
 from pprint import pprint as pp
 
@@ -123,5 +124,6 @@ def main():
 if __name__ == "__main__":
     import doctest
 
-    doctest.testmod()
+    # When running on GitLab CI, a doctest error raised an error
+    doctest.testmod(raise_on_error=environ.get("CI", False))
     sys.exit(main())