WIP - Follows native behaviour in hasClass method. Fixes metal#209

Author: Fernando Souza

packages/metal-dom/src/domNamed.js

@@ -351,6 +351,9 @@ function hasClassWithNative_(element, className) {
  * @private
  */
 function hasClassWithoutNative_(element, className) {
+	if (className.indexOf(' ') >= 0) {
+		throw new Error(`White spaces are not allowed. ('${className}')`);
+	}
 	return (` ${element.className} `).indexOf(` ${className} `) >= 0;
 }
 

packages/metal-dom/test/dom.js

@@ -66,6 +66,13 @@ describe('dom', function() {
 			assert.ok(!dom.hasClass(element, 'class3'));
 		});
 
+		it('should throw an error if white spaces are used in the class name', function() {
+			var element = document.createElement('div');
+			dom.addClasses(element, 'class1 class2');
+
+			assert.throws(() => dom.hasClass(element, 'class1 class2'));
+		});
+
 		it('should check if css classes are being removed', function() {
 			var element = document.createElement('div');
 			dom.addClasses(element, 'class1 class2');