fix tests

Author: vvkh

data_diff/databases/__init__.py

@@ -1,4 +1,5 @@
 from data_diff.databases.base import MD5_HEXDIGITS, CHECKSUM_HEXDIGITS, QueryError, ConnectError, BaseDialect, Database
+from data_diff.databases.base import CHECKSUM_OFFSET
 from data_diff.databases._connect import connect as connect
 from data_diff.databases._connect import Connect as Connect
 from data_diff.databases.postgresql import PostgreSQL as PostgreSQL

tests/common.py

@@ -124,13 +124,13 @@ def str_to_checksum(str: str):
     # hello world
     #   => 5eb63bbbe01eeed093cb22bb8f5acdc3
     #   =>                   cb22bb8f5acdc3
-    #   => 273350391345368515
+    #   => 273350391345368515 - offset (see db.CHECKSUM_OFFSET)
     m = hashlib.md5()
     m.update(str.encode("utf-8"))  # encode to binary
     md5 = m.hexdigest()
     # 0-indexed, unlike DBs which are 1-indexed here, so +1 in dbs
     half_pos = db.MD5_HEXDIGITS - db.CHECKSUM_HEXDIGITS
-    return int(md5[half_pos:], 16)
+    return int(md5[half_pos:], 16) - db.CHECKSUM_OFFSET
 
 
 class DiffTestCase(unittest.TestCase):