We want to ensure that a warning is printed when the `scope` field is missing in the `seedingPolicy`.

``` alice

$ rad node status

! Warning: node 'seedingPolicy.scope' has been set to 'all' by default. This default value will be removed in a future release. Please explicitly set it to one of ['all', 'followed'] in your node config.

[..]

```

#[test]

fn rad_seed_policy_allow_no_scope() {

    let mut environment = Environment::new();

    let alice = environment.node_with(Config {

        seeding_policy: DefaultSeedingPolicy::Allow {

            scope: node::config::Scope::implicit(),

        },

        ..Config::test(Alias::new("alice"))

    });

    let alice = alice.spawn();

    test(

        "examples/rad-seed-policy-allow-no-scope.md",

        environment.work(&alice),

        Some(&alice.home),

        [],

    )

    .unwrap();

}