use super::*;use pretty_assertions::assert_eq;struct HeightRenderable(u16);impl HeightRenderable {    fn with_height(height: u16) -> Self {        Self(height)    }}impl Renderable for HeightRenderable {    fn render(&self, _area: Rect, _buf: &mut Buffer) {}    fn desired_height(&self, _width: u16) -> u16 {        self.0    }}#[test]fn flex_redistributes_space_unused_by_short_children() {    let mut flex = FlexRenderable::new();    flex.push(        /*flex*/ 1,        RenderableItem::Owned(Box::new(HeightRenderable::with_height(/*height*/ 20))),    );    flex.push(        /*flex*/ 1,        RenderableItem::Owned(Box::new(HeightRenderable::with_height(/*height*/ 2))),    );    let allocated = flex.allocate(Rect::new(        /*x*/ 0, /*y*/ 0, /*width*/ 80, /*height*/ 10,    ));    assert_eq!(        allocated            .into_iter()            .map(|area| area.height)            .collect::<Vec<_>>(),        vec![8, 2],    );}#[test]fn flex_reserves_non_flex_space_before_flexible_children() {    let mut flex = FlexRenderable::new();    flex.push(        /*flex*/ 1,        RenderableItem::Owned(Box::new(HeightRenderable::with_height(/*height*/ 20))),    );    flex.push(        /*flex*/ 0,        RenderableItem::Owned(Box::new(HeightRenderable::with_height(/*height*/ 2))),    );    flex.push(        /*flex*/ 1,        RenderableItem::Owned(Box::new(HeightRenderable::with_height(/*height*/ 20))),    );    let allocated = flex.allocate(Rect::new(        /*x*/ 0, /*y*/ 0, /*width*/ 80, /*height*/ 10,    ));    assert_eq!(        allocated            .into_iter()            .map(|area| area.height)            .collect::<Vec<_>>(),        vec![4, 2, 4],    );}