diff --git a/tests/test_plugboard/test_plugboard.py b/tests/test_plugboard/test_plugboard.py
index 2cbbb1b..e2ea09a 100644
--- a/tests/test_plugboard/test_plugboard.py
+++ b/tests/test_plugboard/test_plugboard.py
@@ -37,3 +37,6 @@ def test_plugboard_raises_for_invalid_argument(self):
             Plugboard([("A", "B", "C")])
         with self.assertRaises(InvalidPlugboard):
             Plugboard([("@", "B")])
+
+    def test_plugboard_can_be_empty(self):
+        Plugboard()