diff --git a/tests/functional/gtcs/test_transactions_autocommit_1.py b/tests/functional/gtcs/test_transactions_autocommit_1.py
index a05ebe1b..99e4c9aa 100644
--- a/tests/functional/gtcs/test_transactions_autocommit_1.py
+++ b/tests/functional/gtcs/test_transactions_autocommit_1.py
@@ -10,9 +10,10 @@ DESCRIPTION:
   Test creates three tables (test_1, test_2 and test_3) and AI-trigger for one of them (test_1).
   This trigger does INSERTs into test_2 and test_3.
 
-  Then we add record into test_1 and after this INSERT its trigger add records into test_2 and test_3.
+  Then we add record into test_1 thus its trigger add records into test_2 and test_3.
   After this we make transaction ROLLED BACK and check how many records are preserved.
-  Expected result: each of three tables must have one record in itself, i.e. result looks like we did COMMIT rather than ROLLBACK.
+  Expected result: each of three tables must have one record in itself,
+  i.e. result looks like we did COMMIT rather than ROLLBACK.
 
   NB: we use custom TPB with fdb.isc_tpb_autocommit in order to start DML transactions in AUTOCOMMIT=1 mode.
 FBTEST:      functional.gtcs.transactions_autocommit_1
@@ -20,132 +21,57 @@ FBTEST:      functional.gtcs.transactions_autocommit_1
 
 import pytest
 from firebird.qa import *
+from firebird.driver import *
 
-db = db_factory()
+init_script = """
+    set bail on;
+    recreate table test_1 (x integer);
+    recreate table test_2 (x integer);
+    recreate table test_3 (x integer);
+    commit;
+    set term ^;
+    create or alter trigger trg_test1_ai for test_1 active after insert position 0 as
+    begin
+        insert into test_2 values (new.x * 7);
+        insert into test_3 values (new.x * 777);
+    end ^
+    set term ;^
+    commit;
+"""
+
+db = db_factory(init=init_script)
 
 act = python_act('db', substitutions=[('[ \t]+', ' ')])
 
 expected_stdout = """
-    mon$auto_commit: 1
-    test_1 777
-    test_2 5439
-    test_3 603729
+    mon$auto_commit:	1  
+    test_1				777            			  		 	
+    test_2          	5439   			
+    test_3 				603729 				  		
 """
 
-@pytest.mark.skip('FIXME: Not IMPLEMENTED')
-@pytest.mark.version('>=3')
-def test_1(act: Action):
-    pytest.fail("Not IMPLEMENTED")
+# functional\fkey\unique\test_select_uf_01.py 
+# bugs\core_4840_test.py 
+
+custom_tpb = TPB(lock_timeout = 0, auto_commit=True).get_buffer()
+
+@pytest.mark.version('>=3')
+def test_1(act: Action, capsys):
+    with act.db.connect() as con:
+
+        con.begin(custom_tpb)
+        with con.cursor() as cur:
+            for r in cur.execute('select mon$auto_commit from mon$transactions where mon$transaction_id = current_transaction').fetchall():
+                print('mon$auto_commit:', r[0])
+        
+            cur.execute( 'insert into test_1 values(?)', ( 777,) )
+
+        # Despite this ROLLBACK all *three* records must remain in DB because auto_commit = true:
+        con.rollback()
+
+        with con.cursor() as cur:
+            for r in cur.execute("select 'test_1' tab_name, x from test_1 union all select 'test_2', x from test_2 union all select 'test_3', x from test_3").fetchall():
+                print(r[0], r[1])
+
+    assert act.clean_string(capsys.readouterr().out, act.substitutions) == act.clean_string(expected_stdout, act.substitutions)
 
-# test_script_1
-#---
-#
-#  import os
-#  import sys
-#  import subprocess
-#  import inspect
-#  import time
-#
-#  os.environ["ISC_USER"] = user_name
-#  os.environ["ISC_PASSWORD"] = user_password
-#  db_conn.close()
-#
-#  #--------------------------------------------
-#
-#  def flush_and_close( file_handle ):
-#      # https://docs.python.org/2/library/os.html#os.fsync
-#      # If you're starting with a Python file object f,
-#      # first do f.flush(), and
-#      # then do os.fsync(f.fileno()), to ensure that all internal buffers associated with f are written to disk.
-#      global os
-#
-#      file_handle.flush()
-#      if file_handle.mode not in ('r', 'rb') and file_handle.name != os.devnull:
-#          # otherwise: "OSError: [Errno 9] Bad file descriptor"!
-#          os.fsync(file_handle.fileno())
-#      file_handle.close()
-#
-#  #--------------------------------------------
-#
-#  def cleanup( f_names_list ):
-#      global os
-#      for f in f_names_list:
-#         if type(f) == file:
-#            del_name = f.name
-#         elif type(f) == str:
-#            del_name = f
-#         else:
-#            print('Unrecognized type of element:', f, ' - can not be treated as file.')
-#            del_name = None
-#
-#         if del_name and os.path.isfile( del_name ):
-#             os.remove( del_name )
-#
-#  #--------------------------------------------
-#
-#  sql_init='''
-#      set bail on;
-#      recreate table test_1 (x integer);
-#      recreate table test_2 (x integer);
-#      recreate table test_3 (x integer);
-#      commit;
-#      set term ^;
-#      create or alter trigger trg_test1_ai for test_1 active after insert position 0 as
-#      begin
-#          insert into test_2 values (new.x * 7);
-#          insert into test_3 values (new.x * 777);
-#      end ^
-#      set term ;^
-#      commit;
-#  '''
-#
-#  f_init_sql = open( os.path.join(context['temp_directory'],'tmp_gtcs_tx_ac2.sql'), 'w', buffering = 0)
-#  f_init_sql.write( sql_init )
-#  flush_and_close( f_init_sql )
-#
-#  f_init_log = open( '.'.join( (os.path.splitext( f_init_sql.name )[0], 'log') ), 'w', buffering = 0)
-#  f_init_err = open( '.'.join( (os.path.splitext( f_init_sql.name )[0], 'err') ), 'w', buffering = 0)
-#
-#  subprocess.call( [ context['isql_path'], dsn, '-q', '-i', f_init_sql.name ], stdout = f_init_log, stderr = f_init_err)
-#
-#  flush_and_close( f_init_log )
-#  flush_and_close( f_init_err )
-#
-#  CUSTOM_TX_PARAMS = ( [ fdb.isc_tpb_nowait, fdb.isc_tpb_autocommit ] )
-#
-#  con1 = fdb.connect( dsn = dsn )
-#  tra1 = con1.trans( default_tpb = CUSTOM_TX_PARAMS )
-#
-#  tra1.begin()
-#  cur1=tra1.cursor()
-#
-#  cur1.execute('select mon$auto_commit from mon$transactions where mon$transaction_id = current_transaction')
-#  for r in cur1:
-#      print( 'mon$auto_commit:', r[0] )
-#
-#  cur1.execute( 'insert into test_1 values(?)', ( 777,) )
-#
-#  #----------------------   R O L L B A C K  -----------------------
-#
-#  tra1.rollback()
-#  cur1.close()
-#  con1.close()
-#
-#  #----------------------   R E C O N N E C T  -----------------------
-#
-#  con2 = fdb.connect( dsn = dsn )
-#  cur2=con2.cursor()
-#  cur2.execute("select 'test_1' tab_name, x from test_1 union all select 'test_2', x from test_2 union all select 'test_3', x from test_3")
-#  # Here we must see records from ALL THREE tables.
-#  for r in cur2:
-#      print( r[0], r[1] )
-#
-#  cur2.close()
-#  con2.close()
-#
-#  # cleanup:
-#  ##########
-#  time.sleep(1)
-#  cleanup( ( f_init_sql, f_init_log, f_init_err) )
-#
-#---