You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: size.rs
    path of file: ./repos/freya/crates/torin/tests
    
    the code of the file until where you have to start completion: use euclid::Length;
use torin::{prelude::*, test_utils::*};

#[test]
pub fn unsized_parent_with_child_with_margin() {
    let (mut layout, mut measurer) = test_utils();

    let mut mocked_dom = TestingDOM::default();
    mocked_dom.add(
        0,
        None,
        vec![1],
        Node::from_size_and_direction(Size::Inner, Size::Inner, DirectionMode::Vertical),
    );
    mocked_dom.add(
        1,
        Some(0),
        vec![],
        Node::from_size_and_margin(
            Size::Percentage(Length::new(100.0)),
            Size::Percentage(Length::new(100.0)),
            Gaps::new(10.0, 20.0, 30.0, 40.0),
        ),
    );

    layout.measure(
        0,
        Rect::new(Point2D::new(0.0, 0.0), Size2D::new(1000.0, 1000.0)),
        &mut measurer,
        &mut mocked_dom,
    );

    assert_eq!(
        layout.get(0).unwrap().visible_area(),
        Rect::new(Point2D::new(0.0, 0.0), Size2D::new(1000.0, 1000.0)),
    );

    assert_eq!(
        layout.get(1).unwrap().visible_area(),
        Rect::new(Point2D::new(40.0, 10.0), Size2D::new(940.0, 960.0)),
    );
}

#[test]
pub fn unsized_parent_with_padding() {
    let (mut layout, mut measurer) = test_utils();

    let mut mocked_dom = TestingDOM::default();
    mocked_dom.add(
        0,
        None,
        vec![1],
        Node::from_size_and_padding(Size::Inner, Size::Inner, Gaps::new(10.0, 20.0, 30.0, 40.0)),
    );
    mocked_dom.add(
        1,
        Some(0),
        vec![],
        Node::from_size_and_direction(
            Size::Percentage(Length::new(100.0)),
            Size::Percentage(Length::new(100.0)),
            DirectionMode::Vertical,
        ),
    );

    layout.measure(
        0,
        Rect::new(Point2D::new(0.0, 0.0), Size2D::new(1000.0, 1000.0)),
        &mut measurer,
        &mut mock
    
pub fn direction() {
    let (mut layout, mut measurer) = test_utils();

    let mut mocked_dom = TestingDOM::default();
    mocked_dom.add(
        0,
        None,
        vec![1, 2],
        Node::from_size_and_direction(
            Size::Pixels(Length::new(200.0)),
            Size::Pixels(Length::new(200.0)),
            DirectionMode::Vertical,
        ),
    );
    mocked_dom.add(
        1,
        Some(0),
        vec![],
        Node::from_size_and_direction(
            Size::Pixels(Length::new(100.0)),
            Size::Pixels(Length::new(100.0)),
            DirectionMode::Vertical,
        ),
    );
    mocked_dom.add(
        2,
        Some(0),
        vec![],
        Node::from_size_and_direction(
            Size::Pixels(Length::new(100.0)),
            Size::Pixels(Length::new(100.0)),
            DirectionMode::Vertical,
        ),
    );

    layout.measure(
        0,
        Rect::new(Point2D::new(0.0, 0.0), Size2D::new(1000.0, 1000.0)),
        &mut measurer,
        &mut mocked_dom,
    );

    assert_eq!(
        layout.get(1).unwrap().area,
        Rect::new(Point2D::new(0.0, 0.0), Size2D::new(100.0, 100.0)),
    );

    assert_eq!(
        layout.get(2).unwrap().area,
        Rect::new(Point2D::new(0.0, 100.0), Size2D::new(100.0, 100.0)),
    );

    // Change the direction from vertical to horizontal

    mocked_dom.set_node(
        0,
        Node::from_size_and_direction(
            Size::Pixels(Length::new(200.0)),
            Size::Pixels(Length::new(200.0)),
            DirectionMode::Horizontal,
        ),
    );
    layout.invalidate(0);

    layout.find_best_root(&mut mocked_dom);
    layout.measure(
        0,
        Rect::new(Point2D::new(0.0, 0.0), Size2D::new(1000.0, 1000.0)),
        &mut measurer,
        &mut mocked_dom,
    );

    assert_eq!(
        layout.get(1).unwrap().area,
        Rect::new(Point2D::new(0.0, 0.0), Size2D::new(100.0, 100.0)),
    );

    assert_eq!(
        layout.get(2).unwrap().area,
        Rect::new(Point2D::new(100.0, 0.0), Size2D::new(100.0, 100.0)),
    );
}