Test negative numbers

Author: thiemowmde

tests/src/values/TimeValue.tests.js

@@ -71,6 +71,9 @@ define( [
 		 */
 		testPad: function( assert ) {
 			var testCases = {
+				'-123456789012-00-00T00:00:00Z': '-123456789012-00-00T00:00:00Z',
+				'-12345678901-00-00T00:00:00Z': '-12345678901-00-00T00:00:00Z',
+				'-1-1-1T01:01:01Z': '-00000000001-01-01T01:01:01Z',
 				'1-1-1T01:01:01Z': '+00000000001-01-01T01:01:01Z',
 				'12-00-00T00:00:00Z': '+00000000012-00-00T00:00:00Z',
 				'1234567890-00-00T00:00:00Z': '+01234567890-00-00T00:00:00Z',