Added/Updated tests\bugs\gh_7493_test.py: Checked on 5.0.0.970.

tests/bugs/gh_7493_test.py

@@ -0,0 +1,51 @@
+#coding:utf-8
+
+"""
+ID:          issue-7493
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/7493
+TITLE:       Firebird 5.0 snapshot blob not found error after first commit / rollback
+NOTES:
+    [04.03.2023] pzotov
+    Checked on 5.0.0.970.
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+
+test_script = """
+    create domain xszovegn as blob sub_type 1 segment size 80 not null;
+    create global temporary table test (txt xszovegn) on commit delete rows;
+
+    set term ^;
+    create or alter trigger test_bi1 for test active before insert position 1 as
+    begin
+        if (char_length(new.txt) > 8000) then
+        begin
+            -- nop --
+        end
+    end
+    ^
+    set term ;^
+    commit;
+
+    insert into test(txt) values ('Something');
+    insert into test(txt) values ('Something');
+    insert into test(txt) values ('Something');
+    insert into test(txt) values ('Something');
+    rollback; -- or commit
+
+    insert into test(txt) values ('Something');
+"""
+
+act = isql_act('db', test_script)
+
+expected_stdout = """
+"""
+
+@pytest.mark.version('>=5.0')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute(combine_output = True)
+    assert act.clean_stdout == act.clean_expected_stdout