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.

#  - "path/to/folder"  # ignore folders and all its contents
#  - "test_*.rb"       # wildcards accepted
#  - "**/*.py"         # glob accepted
#  - "[a-z]+/test_.*"  # regexp accepted

# ignore files that are build utils and not executed
# code, or are deprecated.
ignore:
   - "roundup/cgi/TAL/talgettext.py" # utility command
   - "roundup/cgi/TAL/DummyEngine.py" # test harness
   - "roundup/cgi/apache.py"  # mod_python is deprecated
   - "roundup/install_util.py" # another build utlity
   - "roundup/dist"           # more build utils
   - "roundup/test"           # code used for testing