From 7d2f8adf942b4579bc3fe28bc1ade7b26444e8b6 Mon Sep 17 00:00:00 2001
From: Fabian Joswig <fabian.joswig@ed.ac.uk>
Date: Mon, 17 Jul 2023 11:12:21 +0100
Subject: [PATCH] tests: trace N=1 exception tested.

---
 tests/correlators_test.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/correlators_test.py b/tests/correlators_test.py
index 77f35b27..0502462c 100644
--- a/tests/correlators_test.py
+++ b/tests/correlators_test.py
@@ -668,6 +668,10 @@ def test_matrix_trace():
         assert el == 0
 
 
+    with pytest.raises(ValueError):
+        corr.item(0, 0).trace()
+
+
 def test_corr_roll():
     T = 4
     rn = lambda : np.random.normal(0.5, 0.1)