In previous Phoenix version I have been running test in my database without any sandbox and everyting run well.
Because already we have a specific database for development,configured in: config/test.exs
Now upgrade Phoenix and a new feature appear Sandbox

So I want to make all changes insert, update, delete, persistent.

I read this post but it is not was usefull for me:

I don’t want to use Shared mode:

I just only want to remove the sanbox an work in the database

Please can somebody tell me wich is the right way.

This is a part from my test.exs:

import Config

config :gis, Gis.Repo,
  username: "gisuser",
  password: "gisuser",
  hostname: "localhost",
  database: "gisapp" , #{System.get_env("MIX_TEST_PARTITION")}",
  pool: Ecto.Adapters.SQL.Sandbox,
  pool_size: 10

How to configure pool argument to use NO sandbox ?
What must to write to directly use my Repo
Or may be need to change : connn_case.ex file

I try removing the next line from test_helpers.exs

# Ecto.Adapters.SQL.Sandbox.mode(Gis.Repo, :manual)

and remove:

#pool: Ecto.Adapters.SQL.Sandbox,
from config/test.exs

But nothing happen

Also the documentation does not say anything of how to disable it.

please can anybody tell me how to proceed ?

Greetings