From ad1296ae4788bb405ea859a0a5e6a436f33fbdfa Mon Sep 17 00:00:00 2001
From: Fabian Joswig <fabian.joswig@ed.ac.uk>
Date: Wed, 30 Nov 2022 16:47:57 +0000
Subject: [PATCH] tests: Exception for negative matrix in GEVP tested.

---
 tests/correlators_test.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tests/correlators_test.py b/tests/correlators_test.py
index adf4e2ba..c4980a7e 100644
--- a/tests/correlators_test.py
+++ b/tests/correlators_test.py
@@ -310,6 +310,7 @@ def test_GEVP_warnings():
     with pytest.warns(DeprecationWarning):
         corr_mat.GEVP(0, sorted_list="Eigenvalue")
 
+
 def test_GEVP_exceptions():
     corr_aa = _gen_corr(1)
     corr_ab = 0.5 * corr_aa
@@ -371,6 +372,10 @@ def test_GEVP_exceptions():
     with pytest.raises(Exception):
         corr_0.matrix_symmetric()
 
+    n_corr_mat = -corr_mat
+    with pytest.raises(np.linalg.LinAlgError):
+        n_corr_mat.GEVP(2)
+
 
 def test_matrix_symmetric():
     corr_aa = _gen_corr(1)