Add tests to BasicDatabase and merge implementations test/session_common.py: add new tests: * test set with bad __timestamps * test get on missing item with no default * test clear() method * test new lifetime() method everything below here was needed to get the tests to work across all db's. roundup/backends/sessions_dbm.py: make set() validate __timestamp as float. If invalid and item is new, set it to time.time(). If invalid and item exists keep original timestamp. add lifetime(key_lifetime) method. Given key_lifetime in seconds, generate a __timestamp that will be deleted after that many seconds. roundup/backends/sessions_rdbms.py: make set() behave the same as session_dbm. add lifetime method as above. roundup/backends/sessions_sqlite.py: import session_rdbms::BasicDatabase and override __init__. rather than cloning all the code. Kept a few logging and sql methods. roundup/test/memorydb.py: make get() on a missing key return KeyError make set() conform to dbm/rdbms implementations.

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:], '')