DM-15776: Add test for reading headers directly with FitsStorage.

policy/testMapper.yaml

@@ -78,6 +78,11 @@ calibrations:
     template: fringe/fringe_f%(filter)s.fits.gz
 
 datasets:
+  rawMetadataDirect:  # metadata associated with raw, but not using _md hooks
+    template: raw/raw_v%(visit)d_f%(filter)s.fits.gz
+    python: lsst.daf.base.PropertyList
+    persistable: PropertyList
+    storage: FitsStorage
   test_config:
     persistable: Config
     python: lsst.obs.test.TestConfig

tests/test_fitsStorage.py

@@ -0,0 +1,69 @@
+# This file is part of obs_test.
+#
+# Developed for the LSST Data Management System.
+# This product includes software developed by the LSST Project
+# (http://www.lsst.org).
+# See the COPYRIGHT file at the top-level directory of this distribution
+# for details of code ownership.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import os
+import tempfile
+import unittest
+
+# we only import lsst.obs.test.TestMapper from lsst.obs.test, but use the namespace to hide it from pytest
+import lsst.obs.test
+import lsst.utils.tests
+from lsst.utils import getPackageDir
+from lsst.daf.persistence import Butler
+import shutil
+
+
+ROOT = getPackageDir('obs_test')
+
+
+class FitsStorageTestCase(lsst.utils.tests.TestCase):
+
+    def setUp(self):
+        inputDir = os.path.join(ROOT, "data", "input")
+        self.testDir = tempfile.mkdtemp(dir=os.path.join(ROOT, 'tests'), prefix=type(self).__name__+'-')
+        self.butler = Butler(inputs=inputDir, outputs={"root": self.testDir, "mode": 'rw'})
+
+    def tearDown(self):
+        del self.butler
+        if os.path.exists(self.testDir):
+            shutil.rmtree(self.testDir)
+
+    def testReadPropertyList(self):
+        """Test that reading a FitsStorage dataset into a PropertyList
+        is the same as using the special _md Exposure hook.
+        """
+        md1 = self.butler.get("raw_md", visit=1, filter="g")
+        md2 = self.butler.get("rawMetadataDirect", visit=1, filter="g")
+        self.assertEqual(md1, md2)
+
+
+class MemoryTester(lsst.utils.tests.MemoryTestCase):
+    pass
+
+
+def setup_module(module):
+    lsst.utils.tests.init()
+
+
+if __name__ == "__main__":
+    lsst.utils.tests.init()
+    unittest.main()