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diff --git a/tests/test_repository_hygiene.py b/tests/test_repository_hygiene.py
new file mode 100644
index 0000000..ffb7e65
--- /dev/null
+++ b/tests/test_repository_hygiene.py
@@ -0,0 +1,18 @@
+import subprocess
+
+
+def test_python_bytecode_is_not_tracked():
+    tracked = subprocess.run(
+        ["git", "ls-files"],
+        check=True,
+        capture_output=True,
+        text=True,
+    ).stdout.splitlines()
+
+    bytecode = [
+        path
+        for path in tracked
+        if "__pycache__" in path.split("/") or path.endswith((".pyc", ".pyo"))
+    ]
+
+    assert bytecode == []