In tests recreate DB connection with actual time zone

When time zone is changed, JDBC connection still will contain initial time zone. Therefore we need to recreate connection with the newly set TZ

Author: jbaiza

test/simple.rb

@@ -329,11 +329,11 @@ def test_time_in_dst_change_hour_utc
           with_timezone_config default: :utc do
             id = DbType.connection.insert(
               "INSERT INTO db_types (sample_datetime)
-              values ('2024-03-31 03:30:00')"
+              values ('2024-03-31 02:30:00')"
             )
             saved_time = DbType.find(id).sample_datetime
 
-            assert_equal Time.utc(2024, 3, 31, 3, 30), saved_time
+            assert_equal Time.utc(2024, 3, 31, 2, 30), saved_time
             assert_equal 'UTC', saved_time.zone
           end
         end
@@ -352,7 +352,7 @@ def test_time_in_dst_change_hour_local
             )
             saved_time = DbType.find(id).sample_datetime
 
-            assert_equal Time.local(2024, 3, 31, 1, 30), saved_time
+            assert_equal Time.local(2024, 3, 31, 3, 30), saved_time
             assert_not_equal 'UTC', saved_time.zone
           end
         end

test/test_helper.rb

@@ -330,11 +330,18 @@ def with_java_tz(new_tz)
       java.util.TimeZone.setDefault new_tz
       org.joda.time.DateTimeZone.setDefault org.joda.time.DateTimeZone.forTimeZone(new_tz)
       java.lang.System.setProperty 'user.timezone', new_tz.getID
+      connection_properties = ActiveRecord::Base.remove_connection
+      prev_config = connection_properties.configuration_hash
+      new_config = prev_config.deep_dup
+      new_config[:properties] ||= {}
+      new_config[:properties]['serverTimezone'] = new_tz.getID
+      ActiveRecord::Base.establish_connection new_config
       yield
     ensure
       java.util.TimeZone.setDefault old_tz
       org.joda.time.DateTimeZone.setDefault old_jd
       old_user_tz ? java.lang.System.setProperty('user.timezone', old_user_tz) : java.lang.System.clearProperty('user.timezone')
+      ActiveRecord::Base.establish_connection prev_config
     end
   end