fn pane_set() -> PaneSet {

    PaneSet::new(PANES, PaneId::Prompt)

}

fn initial_focus_is_prompt() {

    let ps = pane_set();

    assert_eq!(ps.focused(), PaneId::Prompt);

    assert!(ps.is_focused(PaneId::Prompt));

    assert!(!ps.is_focused(PaneId::Scrollback));

}

fn focus_moves_to_member() {

    let mut ps = pane_set();

    ps.focus(PaneId::Scrollback);

    assert!(ps.is_focused(PaneId::Scrollback));

}

fn focus_on_non_member_is_noop() {

    let mut ps = PaneSet::new(PROMPT_ONLY, PaneId::Prompt);

    ps.focus(PaneId::Scrollback);

    assert!(ps.is_focused(PaneId::Prompt));

}

fn cycle_forward_wraps() {

    let mut ps = pane_set();

    ps.cycle(true);

    assert!(ps.is_focused(PaneId::Scrollback));

    ps.cycle(true);

    assert!(ps.is_focused(PaneId::Prompt));

}

fn cycle_backward_wraps() {

    let mut ps = pane_set();

    ps.cycle(false);

    assert!(ps.is_focused(PaneId::Scrollback));

    ps.cycle(false);

    assert!(ps.is_focused(PaneId::Prompt));

}

fn cycle_forward_then_backward_returns_to_start() {

    let mut ps = pane_set();

    ps.cycle(true);

    ps.cycle(false);

    assert!(ps.is_focused(PaneId::Prompt));

}