Added/Updated tests\bugs\gh_7484_test.py: Checked on 5.0.0.957 - all OK.

tests/bugs/gh_7484_test.py

@@ -0,0 +1,52 @@
+#coding:utf-8
+
+"""
+ID:          issue-7484
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/7484
+TITLE:       External engine SYSTEM not found
+DESCRIPTION:
+NOTES:
+    [02.03.2023] pzotov
+    Confirmed bug on 5.0.0.959 SS (date of build: 26.02.2023), got:
+    "External engine SYSTEM not found / -901 / 335545001"
+
+    Checked on 5.0.0.957 - all OK.
+"""
+
+import pytest
+from firebird.qa import *
+from firebird.driver import tpb, Isolation, TraLockResolution, TraAccessMode, DatabaseError
+
+db = db_factory()
+act = python_act('db')
+
+expected_stdout = """
+"""
+
+@pytest.mark.encryption
+@pytest.mark.version('>=5.0')
+def test_1(act: Action, capsys):
+    sttm = 'select rdb$time_zone_util.database_version() from rdb$database'
+    with act.db.connect() as con1, act.db.connect() as con2:
+        cur1 = con1.cursor()
+        cur2 = con2.cursor()
+
+        try:
+            cur1.execute(sttm)
+            for r in cur1:
+                pass
+            con1.close()
+
+            cur2.execute(sttm)
+            for r in cur2:
+                pass
+
+        except DatabaseError as e:
+            print(e.__str__())
+            print(e.sqlcode)
+            for g in e.gds_codes:
+                print(g)
+    
+    act.expected_stdout = expected_stdout
+    act.stdout = capsys.readouterr().out
+    assert act.clean_stdout == act.clean_expected_stdout