XML troubles.

Hi so I'm trying to output some of my data in XML, it's mostly outputting correctly but there's just one problem, the program requires me to have a strucure as following
<?xml version="1.0" encoding="ISO-8859-7"?>
<testcases>
<testcase name="Kens Test Case">
<summary>This is the data sent from the Gen_4 unit test</summary>
<importance>4</importance>
</steps>
</testcase>
</testcases>

but when I run my script in unity I get

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfTestcase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
<testcase name="test_1">
<summary>testSummury</summary>
<importance>4</importance>
<steps />
</testcase>
</ArrayOfTestcase>

Ok so the problem is that on the second line it should just say
<testcases>
But for some reason it keeps spitting out
<ArrayOfTestcase>

Here is my code, I hope someone can help me with this

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Xml.Serialization;
4. using System.IO;
5. using System.Collections.Generic;
6.  
7. public class UnitTestManager : MonoBehaviour
8. {
9.  
10.     public class testcase
11.     {
12.         public testcase(string name, string summary, string importance, List<Step> steps)
13.         {
14.             this.name = name;
15.             this.summary = summary;
16.             this.importance = importance;
17.             this.steps = steps;
18.         }
19.         public testcase() { }
20.  
21.         [XmlAttribute]
22.         public string name;
23.         public string summary;
24.         public string importance;
25.         public List<Step> steps;
26.     }
27.     public class Step
28.     {
29.         public Step()
30.         {
31.         }
32.  
33.         public Step(int step_number, string actions, string expectedResults)
34.         {
35.             this.step_number = step_number;
36.             this.actions = actions;
37.             this.expectedResults = expectedResults;
38.         }
39.  
40.         public int step_number;
41.         public string actions;
42.         public string expectedResults;
43.  
44.     }
45.     [XmlElement("testcases")]
46.     private List<testcase> testcases;
47.    
48.  
49.     void Serialize()
50.     {
51.         string screenshotFolder = "";
52.         Config.Instance.GetValue(Config.SCREENSHOTFOLDER, ref screenshotFolder);
53.  
54.         XmlSerializer serial = new XmlSerializer(typeof(List<testcase>));
55.  
56.             TextWriter writer = new StreamWriter(screenshotFolder + "UnitTests.xml");
57.             serial.Serialize(writer, testcases);      
58.     }
59.  
60.     void Start()
61.     {
62.        
63.         testcases = new List<testcase>();
64.         testcases.Add(new testcase("test_1", "testSummury", "4", new List<Step>()));
65.         Serialize();
66.     }
67. }