Textinput: Add aria-hidden="true" to clear button and test correct markup

Closes jquery-archivegh-7647

Author: Gabriel Schulhof

js/widgets/forms/clearButton.js

@@ -30,7 +30,7 @@ define( [
 		},
 
 		clearButton: function() {
-			return $( "<a href='#' tabindex='-1' " +
+			return $( "<a href='#' tabindex='-1' aria-hidden='true' " +
 				"class='ui-input-clear ui-btn ui-icon-delete ui-btn-icon-notext ui-corner-all'>" +
 				"</a>" )
 					.attr( "title", this.options.clearBtnText )

tests/unit/textinput/textinput_core.js

@@ -97,7 +97,9 @@
 	});
 
 	test( "data-clear-btn adds clear button to text inputs", function() {
-		ok( $( '#text-input-clear-btn' ).next().is( 'a.ui-input-clear' ), "data-clear-btn adds clear button to text inputs" );
+		ok( $( '#text-input-clear-btn' ).next()
+			.is( 'a.ui-input-clear[tabindex="-1"][aria-hidden="true"]' ),
+			"correctly marked up clear button is present" );
 	});
 
 	test( "data-clear-btn does not add clear button to textarea", function() {