testLayouts.js

( function() {
	const { registerBlockType } = wp.blocks;
	const { createElement: el } = wp.element;
	const { InnerBlocks } = wp.editor;

	registerBlockType( 'block/test-layouts', {
		title: 'Test layouts',
		icon: 'carrot',
		category: 'common',

		edit() {
			return el( 'div', { style: { outline: '1px solid gray', padding: 5 } },
				el( InnerBlocks, {
					layouts: {
						normal: { label: 'Normal Width', icon: 'align-center' },
						wide: { label: 'Width Width', icon: 'align-wide' },
					},
       } )
			);
		},

		save() {
			return el( 'div', { style: { outline: '1px solid gray', padding: 5 } },
				el( InnerBlocks.Content )
			);
		},
    } );
} )();