From 6d5b75a471ee3af53a8897a867f6e97015dff683 Mon Sep 17 00:00:00 2001
From: Aycsi <207523432+aycsi@users.noreply.github.com>
Date: Thu, 14 May 2026 18:21:47 +0200
Subject: [PATCH] test routing null matrix validation

Signed-off-by: Aycsi <207523432+aycsi@users.noreply.github.com>
---
 .../tests/routing/test_warnings_exceptions.py     | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/python/cuopt/cuopt/tests/routing/test_warnings_exceptions.py b/python/cuopt/cuopt/tests/routing/test_warnings_exceptions.py
index aafcb45a6a..2f02d66bf2 100644
--- a/python/cuopt/cuopt/tests/routing/test_warnings_exceptions.py
+++ b/python/cuopt/cuopt/tests/routing/test_warnings_exceptions.py
@@ -70,6 +70,21 @@ def test_dist_mat():
     )
 
 
+def test_dist_mat_null():
+    cost_matrix = cudf.DataFrame(
+        [
+            [0, 5.0, 5.0, 5.0],
+            [5.0, 0, 5.0, 5.0],
+            [5.0, 5.0, 0, 5.0],
+            [5.0, None, 5.0, 0],
+        ]
+    )
+    with pytest.raises(Exception) as exc_info:
+        dm = routing.DataModel(cost_matrix.shape[0], 3)
+        dm.add_cost_matrix(cost_matrix)
+    assert str(exc_info.value) == "cost matrix cannot have NULL values"
+
+
 def test_time_windows():
     cost_matrix = cudf.DataFrame(
         [