Macro makeup::test::make_test_ui

macro_rules! make_test_ui {
    ($root:expr) => { ... };
    ($root:expr, $size:expr) => { ... };
    ($root:expr, $w:expr, $h:expr) => { ... };
}

Create a test UI with a fake renderer and input.

Usage:

let ui = make_test_ui!(root_component);
let ui = make_test_ui!(root_component, 128); // both dimensions
let ui = make_test_ui!(root_component, 256, 64); // width, height