From 0a0cd04589f36c77857dc42d0948504815adeb5c Mon Sep 17 00:00:00 2001
From: "Adam R. Jensen" <39184289+AdamRJensen@users.noreply.github.com>
Date: Mon, 17 Aug 2026 16:28:13 +0200
Subject: [PATCH] Update test_limits.py

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

diff --git a/tests/quality/test_limits.py b/tests/quality/test_limits.py
index cf5a2f2..230c93c 100644
--- a/tests/quality/test_limits.py
+++ b/tests/quality/test_limits.py
@@ -48,6 +48,11 @@ def test_bsrn_limit_zenith_90_upper_is_c():
     assert upper == 100.0
 
 
+def test_bsrn_limit_zenith_nighttime():
+    _, upper = bsrn_limits(95.0, DNI_EXTRA, "ghi-ppl")
+    assert np.isna(upper)
+
+
 def test_bsrn_limit_custom_dict():
     lower, upper = bsrn_limits(SZA, DNI_EXTRA,
                                {"scale": 1.0, "exponent": 1.0, "offset": 99, "lower": -99})