From 83fa08eb0da7815bc426511293bae3c1c3472ce1 Mon Sep 17 00:00:00 2001
From: Doug Torrance <dtorrance@piedmont.edu>
Date: Wed, 15 May 2024 14:14:23 -0400
Subject: [PATCH] Add unit tests for LU decomposition of empty real/complex
 matrices

---
 M2/Macaulay2/tests/normal/LU.m2 | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/M2/Macaulay2/tests/normal/LU.m2 b/M2/Macaulay2/tests/normal/LU.m2
index 3487bea7d7a..d7199c76d53 100644
--- a/M2/Macaulay2/tests/normal/LU.m2
+++ b/M2/Macaulay2/tests/normal/LU.m2
@@ -83,3 +83,9 @@ M == L*U
 L*U
 M
 M == checkLU LUdecomposition M
+
+-- empty matrix (reported by Joel Louwsma in Zulip)
+scan({map(RR^0, RR^0, {}), map(CC^0, CC^0, {})}, M -> (
+	checkLU M;
+	assert Equation(rank M, 0);
+	assert Equation(det M, 1)))