From 396ecdf02cb13eed34940c84606f4d8d890790b7 Mon Sep 17 00:00:00 2001
From: RemDelaporteMathurin <rdelaportemathurin@gmail.com>
Date: Thu, 26 Jan 2023 13:55:22 -0500
Subject: [PATCH] added test that cathces the bug

---
 tests/unit_tests/test_mesh.py | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 tests/unit_tests/test_mesh.py

diff --git a/tests/unit_tests/test_mesh.py b/tests/unit_tests/test_mesh.py
new file mode 100644
index 000000000..08dd65e33
--- /dev/null
+++ b/tests/unit_tests/test_mesh.py
@@ -0,0 +1,9 @@
+import openmc
+import pytest
+
+def test_raises_error_when_flat():
+    with pytest.raises(ValueError):
+        mesh = openmc.RegularMesh()
+        mesh.dimension = [50, 50, 1]
+        mesh.lower_left = [-25, -25, 0]
+        mesh.upper_right = [25, 25, 0]
\ No newline at end of file