fix specificity for :is() selector

Author: rbri

src/main/java/org/htmlunit/cssparser/parser/selector/SelectorSpecificity.java

@@ -17,6 +17,7 @@
 import java.io.Serializable;
 
 import org.htmlunit.cssparser.parser.condition.Condition;
+import org.htmlunit.cssparser.parser.condition.IsPseudoClassCondition;
 import org.htmlunit.cssparser.parser.condition.NotPseudoClassCondition;
 
 /**
@@ -131,8 +132,15 @@ private void readSelectorSpecificity(final Condition condition) {
                 return;
             case NOT_PSEUDO_CLASS_CONDITION:
                 final NotPseudoClassCondition notPseudoCondition = (NotPseudoClassCondition) condition;
-                final SelectorList selectorList = notPseudoCondition.getSelectors();
-                for (final Selector selector : selectorList) {
+                final SelectorList notSelectorList = notPseudoCondition.getSelectors();
+                for (final Selector selector : notSelectorList) {
+                    readSelectorSpecificity(selector);
+                }
+                return;
+            case IS_PSEUDO_CLASS_CONDITION:
+                final IsPseudoClassCondition isPseudoCondition = (IsPseudoClassCondition) condition;
+                final SelectorList isSelectorList = isPseudoCondition.getSelectors();
+                for (final Selector selector : isSelectorList) {
                     readSelectorSpecificity(selector);
                 }
                 return;

src/test/java/org/htmlunit/cssparser/parser/selector/SelectorSpecificityTest.java

@@ -213,4 +213,16 @@ public void notTest() throws Exception {
 
         selectorSpecifity("a:not(#fakeId#fakeId#fakeID)", "0,3,0,1");
     }
+
+    /**
+     * @throws Exception if the test fails
+     */
+    @Test
+    public void isTest() throws Exception {
+        selectorSpecifity("div:is(.inner) p", "0,0,1,2");
+
+        selectorSpecifity("div:is(.inner, #fakeId) p", "0,1,1,2");
+
+        selectorSpecifity("a:is(#fakeId#fakeId#fakeID)", "0,3,0,1");
+    }
 }