Added/Updated tests\bugs\gh_0731_test.py: Checked on all recent 3.x ... 6.x

tests/bugs/gh_0731_test.py

@@ -0,0 +1,97 @@
+#coding:utf-8
+
+"""
+ID:          issue-731
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/731
+TITLE:       coalesce fails with data type varchar and a non ascii value [CORE388]
+DESCRIPTION:
+NOTES:
+    [04.09.2024] pzotov
+    The issue seems to be fixed long ago.
+    Old FB versions can not be checked on current firebird QA.
+    Checked on all recent 3.x ... 6.x -- all fine.
+"""
+
+import pytest
+from firebird.qa import *
+
+init_sql = """
+    recreate table trans_table
+    (
+        tcode smallint
+        not null,
+        code smallint
+        not null,
+        name varchar(10),
+        constraint trans_table_primarykey primary key
+        (tcode, code)
+    );
+
+    recreate table class1
+    (
+        class_name varchar(10)
+        not null,
+        class_num smallint
+        not null,
+        teacher_id integer,
+        constraint pk_class1 primary key (class_name, class_num)
+    );
+
+    recreate table class2
+    (
+        class_name varchar(10)
+        not null,
+        class_num smallint
+        not null,
+        teacher_id integer,
+        constraint pk_class2 primary key (class_name, class_num)
+    );
+
+    set term ^;
+    create trigger class1_bi for class1 active before insert position 0 as
+        declare name varchar(10);
+    begin
+        select name from trans_table c where c.tcode=2 and c.code=new.class_name
+        into :name;
+        new.class_name = case when :name is null then new.class_name else :name end;
+        -- new.class_name = coalesce(:name, new.class_name);
+    end
+    ^
+
+    create trigger class2_bi for class2 active before insert position 0 as
+        declare name varchar(10);
+    begin
+        select name from trans_table c where c.tcode=2 and c.code=new.class_name
+        into :name;
+        -- new.class_name = case when :name is null then new.class_name else :name end;
+        new.class_name = coalesce(:name, new.class_name);
+    end
+    ^
+    set term ;^
+    commit;
+"""
+db = db_factory(init = init_sql, charset='win1252')
+
+test_script = """
+    set bail on;
+    set list on;
+    insert into trans_table(tcode, code, name) values (2, 1, 'à');
+    -- passed
+    insert into class1(class_name, class_num, teacher_id) values (1, 1, null);
+    -- failed
+    insert into class2(class_name, class_num, teacher_id) values (1, 1, null);
+    select 'Passed' as msg from rdb$database;
+"""
+
+act = isql_act('db', test_script, substitutions = [ ('[ \t]+',' ') ])
+
+expected_stdout = """
+    MSG Passed
+"""
+
+@pytest.mark.version('>=3.0')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute(charset = 'win1252')
+    assert act.clean_stdout == act.clean_expected_stdout
+