diff --git a/cayceops/tests/test_rojo_r21.py b/cayceops/tests/test_rojo_r21.py
new file mode 100644
index 0000000..a4dee13
--- /dev/null
+++ b/cayceops/tests/test_rojo_r21.py
@@ -0,0 +1,2 @@
+def test_rojo_r21():
+    assert False, "rojo a proposito — el CI (post-#44) debe bloquear"