Added/Updated tests\functional\intfunc\unlist\unlist_ascii_char_0_test.py: Checked on 6.0.0.744

Author: pavel-zotov

tests/functional/intfunc/unlist/unlist_ascii_char_0_test.py

@@ -0,0 +1,38 @@
+#coding:utf-8
+
+"""
+ID:          issue-8418
+ISSUE:       https://github.com/FirebirdSQL/firebird/pull/8418
+TITLE:       UNLIST function. Check ability to use ascii_char(0) as delimiter.
+DESCRIPTION:
+    On 6.0.0.725-a2b05f4-x64 usage of ascii_char(0) as separator causes 100% CPU load and FB service could not be stopped.
+    See: https://github.com/FirebirdSQL/firebird/pull/8418#issuecomment-2792358627
+    Fixed 19.04.2025 20:36:
+    https://github.com/FirebirdSQL/firebird/commit/33ad7e632ae073223f808c8fdc83673d6d04e454
+NOTES:
+    [23.04.2025] pzotov
+    Checked on 6.0.0.744
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+
+test_script = f"""
+    set list on;
+    set count on; select * from unlist('1', ascii_char(0)) as u(x);
+"""
+
+act = isql_act('db', test_script, substitutions=[ ('[ \\t]+', ' ') ])
+
+expected_stdout = f"""
+    X 1
+    Records affected: 1
+"""
+
+@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