diff --git a/Makefile b/Makefile
index fea27e8..4bdcb67 100644
--- a/Makefile
+++ b/Makefile
@@ -17,6 +17,10 @@ help:
 docs: print-env
 	@${MKDOCS} ${MKDOCS_OPTION} -f docs/mkdocs.yml
 
+.PHONY: tests #: Run unit tests.
+tests:
+	@${UNITTEST} discover -s tests
+
 .PHONY: notebooks #: Run jupyter notebooks.
 notebooks:
 	@${JUPYTER} ${JUPYTER_OPTION}
diff --git a/config/.env.example b/config/.env.example
index b254545..9a8d79a 100644
--- a/config/.env.example
+++ b/config/.env.example
@@ -4,6 +4,7 @@
 POETRY=poetry
 MKDOCS=mkdocs
 JUPYTER=jupyter
+UNITTEST=python -m unittest
 
 ## Ankisyncd
 ANKISYNCD_HOST=0.0.0.0