From 9c9b01eebe9bf401b40b41694863015d43202caa Mon Sep 17 00:00:00 2001
From: Eli Rykoff <erykoff@stanford.edu>
Date: Mon, 11 Sep 2023 16:00:51 -0700
Subject: [PATCH] Add tests for exposure summary stats column forwarding.

---
 tests/test_exposure.py | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tests/test_exposure.py b/tests/test_exposure.py
index 46e7358c0..15f2aea88 100644
--- a/tests/test_exposure.py
+++ b/tests/test_exposure.py
@@ -26,6 +26,7 @@
 import dataclasses
 import os.path
 import unittest
+import warnings
 
 import numpy as np
 from numpy.testing import assert_allclose
@@ -1158,6 +1159,31 @@ def testExposureSummaryExtraComponents(self):
         self.assertEqual(summaryStats.ra, testDict['ra'])
         self.assertEqual(summaryStats.dec, testDict['dec'])
 
+    def testExposureSummaryForwardComponents(self):
+        """Test that we can forward extra components (e.g. decl->dec).
+        """
+        testDict = {'ra': 10.0,
+                    'decl': 10.0}
+        bytes = yaml.dump(testDict, encoding='utf-8')
+        # Cleanly forwarded fields must not result in a warning.
+        with warnings.catch_warnings():
+            warnings.simplefilter("error")
+            summaryStats = lsst.afw.image.ExposureSummaryStats._read(bytes)
+
+        self.assertEqual(summaryStats.ra, testDict['ra'])
+        self.assertEqual(summaryStats.dec, testDict['decl'])
+
+        # And check if there are both listed, it should use the new dec value.
+        testDict = {'ra': 10.0,
+                    'dec': 5.0,
+                    'decl': 10.0}
+        bytes = yaml.dump(testDict, encoding='utf-8')
+        with self.assertWarns(FutureWarning):
+            summaryStats = lsst.afw.image.ExposureSummaryStats._read(bytes)
+
+        self.assertEqual(summaryStats.ra, testDict['ra'])
+        self.assertEqual(summaryStats.dec, testDict['dec'])
+
     def testExposureSummarySchema(self):
         """Test that we can make a schema for an exposure summary and populate
         records with that schema.