diff --git a/Makefile b/Makefile
index 47f7ad3..d62633e 100644
--- a/Makefile
+++ b/Makefile
@@ -55,8 +55,8 @@ clean-test: ## remove test and coverage artifacts
 	rm -fr htmlcov/
 
 lint: ## reformat with black and check style with flake8
-	black src tests
-	ruff src tests
+	black src tests noxfile.py
+	ruff src tests noxfile.py
 
 test: lint ## run tests quickly, stop on first error
 	pytest tests -x -l --last-failed --disable-warnings -m "not functional"
diff --git a/noxfile.py b/noxfile.py
index fc22120..e44c239 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -1,3 +1,6 @@
+import pathlib
+import tempfile
+
 import nox
 
 
@@ -6,3 +9,22 @@ def tests(session):
     session.install(".[test]")
 
     session.run("pytest", *session.posargs)
+
+
+@nox.session(python=["3.9", "3.10", "3.11"])
+@nox.parametrize(
+    ("repo", "test_dir"),
+    [
+        ("https://git.sgbio.de/Safeguard/mbp_hyb_calls", "tests"),
+    ],
+)
+def downstream(session, repo, test_dir):
+    session.install(".")
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        session.run("git", "clone", repo, tmpdir, external=True)
+
+        session.install(f"{tmpdir}[test]")
+
+        test_path = pathlib.Path(tmpdir) / test_dir
+        session.run("pytest", test_path)