Added/Updated tests\bugs\gh_7924_2_test.py: Checked on 6.0.0.219 after commit bcc53d43

Author: pavel-zotov

tests/bugs/gh_7924_2_test.py

@@ -0,0 +1,59 @@
+#coding:utf-8
+
+"""
+ID:          issue-7924
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/7924
+TITLE:       ALTER TABLE ALTER COLUMN <textual_field> can not be changed properly in some cases
+NOTES:
+    [22.01.2024] pzotov
+    Checked on 6.0.0.219 (after commit https://github.com/FirebirdSQL/firebird/commit/bcc53d43c8cd0b904d2963173c153056f9465a09)
+    TODO: check ability to insert into fields some data specific to appropriate collation and proper order of selected characters.
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory(charset = 'utf8')
+
+test_script = """
+    alter character set utf8 set default collation unicode_ci;
+    alter character set win1250 set default collation win_cz_ci_ai;
+    alter character set win1252 set default collation win_ptbr;
+    alter character set win1257 set default collation win1257_ee;
+    commit;
+     
+    create table test(
+        f_init_1252 varchar(10) character set win1252
+       ,f_init_1257 varchar(10) character set win1257
+       ,f_init_utf8 varchar(10) character set utf8
+    );
+    commit;
+
+    alter table test
+        alter column f_init_1252 to f_curr_1250
+       ,alter column f_curr_1250 type varchar(10) character set win1250
+       -----------------------------------------------------------
+       ,alter column f_init_1257 to f_curr_1252
+       ,alter column f_curr_1252 type varchar(10) character set win1252
+       -----------------------------------------------------------
+       ,alter column f_init_utf8 to f_curr_1257
+       ,alter column f_curr_1257 type varchar(10) character set win1257
+    ;
+    commit;
+     
+    show table test; -------------------- [ 1 ]
+"""
+
+act = isql_act('db', test_script)
+
+expected_stdout = """
+   F_CURR_1250                     VARCHAR(10) CHARACTER SET WIN1250 COLLATE WIN_CZ_CI_AI Nullable
+   F_CURR_1252                     VARCHAR(10) CHARACTER SET WIN1252 COLLATE WIN_PTBR Nullable
+   F_CURR_1257                     VARCHAR(10) CHARACTER SET WIN1257 COLLATE WIN1257_EE Nullable
+"""
+
+@pytest.mark.version('>=6.0')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute(combine_output = True)
+    assert act.clean_stdout == act.clean_expected_stdout