test serialization

Author: rbri

src/main/java/org/htmlunit/attachment/CollectingAttachmentHandler.java

@@ -31,7 +31,7 @@
  */
 public class CollectingAttachmentHandler implements AttachmentHandler {
 
-    private final List<Attachment> collectedAttachments_;
+    private final ArrayList<Attachment> collectedAttachments_;
 
     /**
      * Creates a new instance.
@@ -46,7 +46,7 @@ public CollectingAttachmentHandler() {
      */
     public CollectingAttachmentHandler(final List<Attachment> list) {
         WebAssert.notNull("list", list);
-        collectedAttachments_ = list;
+        collectedAttachments_ = new ArrayList<>(list);
     }
 
     /**

src/test/java/org/htmlunit/attachment/CollectingAttachmentHandlerTest.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2002-2023 Gargoyle Software Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.htmlunit.attachment;
+
+import org.apache.commons.lang3.SerializationUtils;
+import org.htmlunit.SimpleWebTestCase;
+import org.htmlunit.UnexpectedPage;
+import org.htmlunit.junit.BrowserRunner;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Tests for {@link CollectingAttachmentHandler}.
+ *
+ * @author Ronald Brill
+ */
+@RunWith(BrowserRunner.class)
+public class CollectingAttachmentHandlerTest extends SimpleWebTestCase {
+
+    /**
+     * @throws Exception if an error occurs
+     */
+    @Test
+    public void serialization() throws Exception {
+        final byte[] bytes = SerializationUtils.serialize(new CollectingAttachmentHandler());
+
+        final CollectingAttachmentHandler deserialized =
+                (CollectingAttachmentHandler) SerializationUtils.deserialize(bytes);
+        deserialized.handleAttachment(new UnexpectedPage(null, null));
+    }
+}