How to use the jquery-ui.min.css function in jquery-ui

pkg.toJson(function( error, files ) {
			if (error) {
				return test.done( error );
			}
			commonFilesCheck( test, files );
			themeFilesCheck( test, files, true );

			// 11 components selected, 7 have CSS, plus core, theme,
			// checkboxradio, controlgroup (tmp button dependencies)
			var includes = files[ "jquery-ui.min.css" ].match( /\* Includes: (.+)/ );
			test.equal( includes[ 1 ].split( "," ).length, 11, someWidgets2 + " -> " + includes[ 1 ] );

			test.done();
		});
	},

function Package( files, runtime ) {
	this.themeGallery = ThemeGallery( runtime.jqueryUi );
	if ( !runtime.themeVars ) {
		runtime.themeVars = this.themeGallery[ 0 ].vars;
	}
	Package1_12.apply( this, arguments );
}

extend( Package.prototype, {
	"AUTHORS.txt": Package1_12.prototype[ "AUTHORS.txt" ],
	"LICENSE.txt": Package1_12.prototype[ "LICENSE.txt" ],
	"images": Package1_12.prototype[ "images" ],
	"jquery-ui.css": Package1_12.prototype[ "jquery-ui.css" ],
	"jquery-ui.structure.css": Package1_12.prototype[ "jquery-ui.structure.css" ],
	"jquery-ui.theme.css": Package1_12.prototype[ "jquery-ui.theme.css" ],
	"jquery-ui.min.css": Package1_12.prototype[ "jquery-ui.min.css" ],
	"jquery-ui.structure.min.css": Package1_12.prototype[ "jquery-ui.structure.min.css" ],
	"jquery-ui.theme.min.css": Package1_12.prototype[ "jquery-ui.theme.min.css" ],

	"themes": function( callback ) {
		var files = {};
		var structureCssFileNames = this.structureCssFileNames;
		var themeCssFileNames = this.themeCssFileNames;
		var pkgJson = this.pkgJson;
		var themeGallery = this.themeGallery;
		this.structureCss.promise.then( function( structureCss ) {
			async.mapSeries( themeGallery, function( theme, callback ) {
				var themeCss = theme.css();

				files[path.join(theme.folderName(), "theme.css")] = themeCss;

				var _banner = banner( pkgJson, structureCssFileNames.concat( themeCssFileNames ), {