diff --git a/tests/test_router_circular_import.py b/tests/test_router_circular_import.py
new file mode 100644
index 0000000000..a1c1d4c8d0
--- /dev/null
+++ b/tests/test_router_circular_import.py
@@ -0,0 +1,10 @@
+import pytest
+from fastapi import FastAPI, APIRouter
+
+def test_router_circular_import():
+    app = FastAPI()
+    router = APIRouter()
+
+    app.include_router(router)
+    with pytest.raises(AssertionError, match="Router cannot be the same as parent"):
+        router.include_router(router)
\ No newline at end of file