def _get_checkpoints(cls, db: DatabaseAPI) -> Tuple[Hash32, ...]:
concatenated_checkpoints = db.get(
SchemaV1.make_checkpoint_headers_key())
if concatenated_checkpoints is None:
return ()
else:
return tuple(
Hash32(concatenated_checkpoints[index:index + 32])
for index in range(0, len(concatenated_checkpoints), 32))
def test_database_api_get(self, db: DatabaseAPI) -> None:
db[b'key-1'] = b'value-1'
assert db.get(b'key-1') == b'value-1'
def test_database_api_get_missing_key(self, db: DatabaseAPI) -> None:
assert b'key-1' not in db
assert db.get(b'key-1') is None