testAlign.js

( function() {
	var registerBlockType = wp.blocks.registerBlockType;
	var el = wp.element.createElement;

	registerBlockType( 'test/align', {
		title: 'Test Align',
		icon: 'cart',
		category: 'common',
		attributes: {
			align: {
				type: 'string',
				default: 'right',
			},
		},
		supports: {
			align: true,
		},

		edit: function( props ) {
			return el( 'div', { style: { outline: '1px solid gray', padding: 5 } },
				'Test Align Block'
			);
		},

		save: function() {
			return el( 'div', { style: { outline: '1px solid gray', padding: 5 } },
				'Test Align Block'
			);
		},
	} );
} )();