fix: close file properly in indexer_dbm.py:save_index() Fix this error found in debug logs of gentoo packaging of round 2.2.0. /roundup/backends/indexer_dbm.py:253: ResourceWarning: unclosed file <_io.BufferedWriter name='test-index/indexes/index.db-'> open(self.indexdb+'-', 'wb').write(zlib.compress(marshal.dumps(dbfil))) Also added test that calls save_index(), reloads the index and tests that the original item. I am not sure how Gentoo hit this But they were missing a number of backends. So it's possible that indexer_dbm.py is not getting fully tested depending on what is installed on the system. Codecov from CI didnt show indexer_dbm.py:save_index() being covered.

--- a/roundup/backends/indexer_dbm.py	Mon Oct 30 21:57:21 2023 -0400
+++ b/roundup/backends/indexer_dbm.py	Thu Nov 02 18:55:47 2023 -0400
@@ -250,7 +250,9 @@
 
         # First write the much simpler filename/fileid dictionaries
         dbfil = {'WORDS': None, 'FILES': self.files, 'FILEIDS': self.fileids}
-        open(self.indexdb+'-', 'wb').write(zlib.compress(marshal.dumps(dbfil)))
+        marshal_fh = open(self.indexdb+'-', 'wb')
+        marshal_fh.write(zlib.compress(marshal.dumps(dbfil)))
+        marshal_fh.close()
 
         # The hard part is splitting the word dictionary up, of course
         letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ#_"