Terraform test - Override_resource on terraform_data or null_resource

I've tried override_resource in many different resources for my tests. But I'm unable to do so with terraform_data or null_resource.

For example:

resource "time_offset" "one_year" {
  offset_years = 1
}

resource "null_resource" "example" {
  provisioner "local-exec" {
    command = "echo a"
  }
}

And tftest: run "test" { command = apply assert { condition = timecmp(time_offset.one_year.rfc3339, timeadd(timestamp(), "8761h")) == -1 && timecmp(time_offset.one_year.rfc3339, timeadd(timestamp(), "8759h")) == 1 error_message = "${timestamp()} ${time_offset.one_year.rfc3339} Expiration date did not match expected" } }

override_resource {
  target = null_resource.example
  values = {
    input  = "sup"
    output = "aaaa"
    id     = "send help"
  }
}

In this example, If I do time_offset override resource I get the random 8 alphanumeric string which is expected.

Is there a way to do it? My objective is to skip it entirely so it doesn't run during tests.