fix: fix code to make tests of session and otks databases pass on windows The existing code had a few issues: sessions_dbm.py: detect dumbdbm when used on windows python and properly delete session/otks databases so clear() works. make sure the Session/Otks.cache_db_type() is called even when the database is newly created. test/session_common.py: close session and otks database in teardown before deleting database directory to prevent errors from deleting open files on windows. test/test_sqlite.py: close the session and otks databases opened by SessionTest.setUp(self) so the salite session/otks database are closed before the new anydbm sessions databases are opened for testing the sqlite main db and anydbm as session/otks db. Again this causes deletion of database test directory to fail on windows as you can't delete open files.

class StringFragmentCmpHelper:
    def compareStringFragments(self, s, fragments):
        """Compare a string agains a list of fragments where a tuple denotes a
        set of alternatives
        """
        pos = 0
        for frag in fragments:
            if type(frag) != tuple:
                self.assertEqual(s[pos:pos + len(frag)], frag)
                pos += len(frag)
            else:
                found = False
                for alt in frag:
                    if s[pos:pos + len(alt)] == alt:
                        pos += len(alt)
                        found = True
                        break

                if not found:
                    l = max(map(len, frag))
                    raise AssertionError('%s != %s' %
                                         (repr(s[pos:pos + l]), str(frag)))
        self.assertEqual(s[pos:], '')