From 2b46109ece3419886a863b6463da2916a42da592 Mon Sep 17 00:00:00 2001
From: Thomas Robitaille <thomas.robitaille@gmail.com>
Date: Fri, 26 Apr 2024 12:36:05 +0100
Subject: [PATCH] Added regression test

---
 glue/viewers/profile/tests/test_viewer.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/glue/viewers/profile/tests/test_viewer.py b/glue/viewers/profile/tests/test_viewer.py
index 16a29b668..eb6f8e866 100644
--- a/glue/viewers/profile/tests/test_viewer.py
+++ b/glue/viewers/profile/tests/test_viewer.py
@@ -165,3 +165,9 @@ def test_unit_conversion():
     assert_allclose(viewer.state.x_max, (0.5 * u.GHz).to_value(u.cm, equivalencies=u.spectral()))
     assert_allclose(viewer.state.y_min, 0.5)
     assert_allclose(viewer.state.y_max, 3.5)
+
+    # Regression test for a bug that caused unit changes to not work on y axis
+    # if reference data was not first layer
+
+    viewer.state.reference_data = d2
+    viewer.state.y_display_unit = 'mJy'