Minor cleanup with tests

Added converter on saving in db user

spring-data-mongodb/src/main/java/org/baeldung/model/EmailAddress.java

@@ -0,0 +1,34 @@
+package org.baeldung.model;
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+@Document
+public class EmailAddress {
+    @Id
+    private String id;
+    private String value;
+    
+    public EmailAddress(){
+    }
+    
+    public EmailAddress(String value) {
+        this.value =  value;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+    }
+}