Added/Updated tests\bugs\gh_7627_test.py: Checked on 5.0.0.1170, 4.0.4.2979

Author: pavel-zotov

tests/bugs/gh_7627_test.py

@@ -0,0 +1,65 @@
+#coding:utf-8
+
+"""
+ID:          issue-7627
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/7627
+TITLE:       The size of the database with big records becomes bigger after backup/restore
+DESCRIPTION:
+    Test creates table with 'very width' column, adds data to it (padded GUID strings) and makes b/r.
+    New size of database (after restore) must not exceed initial one.
+NOTES:
+    [26.08.2023] pzotov
+    Column size must be VERY CLOSE to maximal allowed by implementation.
+    On 5.0.0.1070 (date of build 14-jun-2023) bug can be reproduced when 
+    column size is 32760, but on size = 32000 this is not so: DB size remains the same.
+
+    Confirmed bug on 5.0.0.1070.
+    Checked on 5.0.0.1170, 4.0.4.2979
+"""
+
+from io import BytesIO
+from pathlib import Path
+
+import pytest
+from firebird.qa import *
+from firebird.driver import SrvRestoreFlag
+
+substitutions_1 = [('[ \t]+', ' ')]
+
+PG_SIZE = 8192
+init_script = """
+    create table test(s varchar(32765));
+    insert into test select lpad('', 32765, uuid_to_char(gen_uuid())) from rdb$types;
+    commit;
+"""
+
+tmp_fbk = temp_file( filename = 'tmp_gh_6709.fbk')
+db = db_factory(init = init_script, charset = 'win1251', page_size = PG_SIZE)
+
+act = python_act('db')
+
+expected_stdout = "DB size did not increase after restore."
+
+@pytest.mark.version('>=4.0.3')
+def test_1(act: Action, tmp_fbk: Path, capsys):
+
+    db_init_size = Path(act.db.db_path).stat().st_size
+
+    # backup + restore without creating .fbk:
+    #
+    bkp_data = BytesIO()
+    with act.connect_server() as srv:
+        srv.database.local_backup(database = act.db.db_path, backup_stream = bkp_data)
+        bkp_data.seek(0)
+        srv.database.local_restore(backup_stream = bkp_data, database = act.db.db_path, flags = SrvRestoreFlag.REPLACE)
+
+    db_curr_size = Path(act.db.db_path).stat().st_size
+    if db_init_size - db_curr_size >= 0:
+        print(expected_stdout)
+    else:
+        print(f'DB size increased after restore for {db_curr_size - db_init_size} bytes, from {db_init_size} to {db_curr_size}')
+
+    act.expected_stdout = expected_stdout
+    act.stdout = capsys.readouterr().out
+    assert act.clean_stdout == act.clean_expected_stdout
+    act.reset()