test: add serialization test

Add javax.servlet-api dependency to pom

Author: ngonzalezpazFC

pom.xml

@@ -131,6 +131,13 @@
 			<version>3.0.0</version>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>javax.servlet</groupId>
+			<artifactId>javax.servlet-api</artifactId>
+			<version>3.1.0</version>
+			<type>jar</type>
+			<scope>test</scope>
+		</dependency>
     </dependencies>
 
     <build>

src/test/java/com/flowingcode/addons/chipfield/test/SerializationTest.java

@@ -0,0 +1,47 @@
+/*-
+ * #%L
+ * ChipField Addon
+ * %%
+ * Copyright (C) 2018 Flowing Code
+ * %%
+ * 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
+ *
+ *      http://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.
+ * #L%
+ */
+package com.flowingcode.addons.chipfield.test;
+
+import com.flowingcode.vaadin.addons.chipfield.ChipField;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import org.junit.Test;
+
+public class SerializationTest {
+
+    private void testSerializationOf(Object obj) throws IOException, ClassNotFoundException {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
+            oos.writeObject(obj);
+        }
+        try (ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()))) {
+            obj.getClass().cast(in.readObject());
+        }
+    }
+
+    @Test
+    public void testSerialization() throws ClassNotFoundException, IOException {
+		testSerializationOf(new ChipField<>("Label", "Item1", "Item2", "Item3"));
+    }
+
+}