Document serialVersionUID (#163)

* Document serialVersionUID

* old serialVersionUID

src/main/java/io/redisearch/Document.java

@@ -14,8 +14,10 @@
  */
 public class Document implements Serializable {
 
+    private static final long serialVersionUID = 4884173545291367373L;
+
     private static final Gson gson = new Gson();
-  
+
     private String id;
     private double score;
     private byte[] payload;

src/test/java/io/redisearch/DocumentTest.java

@@ -0,0 +1,44 @@
+package io.redisearch;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.HashMap;
+import java.util.Map;
+import org.junit.Test;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+public class DocumentTest {
+
+  @Test
+  public void serialize() throws IOException, ClassNotFoundException {
+    String id = "9f";
+    double score = 10d;
+    Map<String, Object> map = new HashMap<>();
+    map.put("string", "c");
+    map.put("float", 12d);
+    byte[] payload = "1a".getBytes();
+    Document document = new Document(id, map, score, payload);
+
+    ByteArrayOutputStream aos = new ByteArrayOutputStream();
+    ObjectOutputStream oos = new ObjectOutputStream(aos);
+    oos.writeObject(document);
+    oos.flush();
+    oos.close();
+
+    ByteArrayInputStream ais = new ByteArrayInputStream(aos.toByteArray());
+    ObjectInputStream ois = new ObjectInputStream(ais);
+    Document read = (Document) ois.readObject();
+    ois.close();
+
+    assertEquals(id, read.getId());
+    assertEquals(score, read.getScore(), 0d);
+    assertArrayEquals(payload, read.getPayload());
+    assertEquals("c", read.getString("string"));
+    assertEquals(Double.valueOf(12d), read.get("float"));
+  }
+}