Mocking during one test or one test module only

Questions & Help Questions
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This is the contents of my test/test_helper.exs

ExUnit.start()

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

Mox.defmock(ProcessosApiKafka.PublicadorMock, for: ProcessosApiKafka.Publicador)

Update:

In order for it to work on my side I had to change all of test/suport/*_case.ex files to have

    import Mox, only: [stub_with: 2]

    ProcessosApiKafka.PublicadorMock
    |> stub_with(ProcessosApiKafka.Publicador)

Inside its setup block, for instance, inside test/support/data_case.ex

setup tags do
    :ok = Ecto.Adapters.SQL.Sandbox.checkout(ProcessosApi.Repo)

    unless tags[:async] do
      Ecto.Adapters.SQL.Sandbox.mode(ProcessosApi.Repo, {:shared, self()})
    end

    import Mox, only: [stub_with: 2]

    ProcessosApiKafka.PublicadorMock
    |> stub_with(ProcessosApiKafka.Publicador)

    {:ok, conn: Phoenix.ConnTest.build_conn()}
  end

This seems pretty different from what @doodloo showed, but I couldn’t make it compile the other way. Do you have any idea what I’m doing wrong here?