Add failing test

This tests that the METS file can be parsed when the bogus amdSec is
associated with the objects directory of the structMap.

It raises the same exception shown in issue #1129.

Author: replaceafill

tests/test_mets.py

@@ -1216,3 +1216,14 @@ def test_filegrp_sorting_returns_non_default_groups(
     result = mw._sort_filegrps(file_groups)
 
     assert [g.attrib["USE"] for g in result] == expected_uses_order
+
+
+def test_document_ignores_missing_bag_metadata_amdsec_on_the_objects_directory():
+    mets_path = "fixtures/mets_with_missing_bag_metadata_amdsec.xml"
+
+    mw = metsrw.METSDocument.fromfile(mets_path)
+
+    objects_directory = mw.get_file(
+        type="Directory", label="objects", path=None, use=None
+    )
+    assert not objects_directory.amdsecs