To ensure that we can handle diverse workflows, we also allow patches to be

opened when we're in the infamous 'detached HEAD' state.

First, we will enter this state by using `git checkout` on a commit object:

``` (stderr) RAD_HINT=1

$ git checkout f2de534b5e81d7c6e2dcaf58c3dd91573c0a0354

Note: switching to 'f2de534b5e81d7c6e2dcaf58c3dd91573c0a0354'.

You are in 'detached HEAD' state. You can look around, make experimental

changes and commit them, and you can discard any commits you make in this

state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may

do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at f2de534 Second commit

```

Now, we can create a commit on top of this and create a patch, as usual:

``` (stderr) RAD_HINT=1

$ git commit -a -m "Add things" -q --allow-empty

$ git push -o patch.message="Add things #1" -o patch.message="See commits for details." rad HEAD:refs/patches

✓ Patch 6035d2f582afbe01ff23ea87528ae523d76875b6 opened

hint: offline push, your node is not running

hint: to sync with the network, run `rad node start`

To rad://z42hL2jL4XNk6K8oHQaSWfMgCL7ji/z6MknSLrJoTcukLrE435hVNQT4JUhbvWLX4kUzqkEStBU8Vi

 * [new reference]   HEAD -> refs/patches

```

Note that there will be no upstream branch, since we did not have a branch to

set an upstream for in the first place!

fn rad_patch_detached_head() {

    let mut environment = Environment::new();

    let profile = environment.profile(config::profile("alice"));

    let working = tempfile::tempdir().unwrap();

    let home = &profile.home;

    // Setup a test repository.

    fixtures::repository(working.path());

    test("examples/rad-init.md", working.path(), Some(home), []).unwrap();

    test(

        "examples/rad-patch-detached-head.md",

        working.path(),

        Some(home),

        [],

    )

    .unwrap();

}

#[test]

    // Can't set an upstream for something that's not a branch

    if !r.is_branch() {

        return Ok(None);

    }