public Test AddAndEditTest(String testName, 
                           String testType = "SYSTEM-TEST", 
                           SubjectNode containingFolder)
{
  try
  {
    TestFactory testF;
    SubjectNode SubjRoot;
    TDFilter tFilter;
    List tList;
    String qTName;
    VCS versionCtl;
    bool bIsLocked;
    String strLockedBy;

    String tempStr = String.Empty;
    Test objTest = null;

    testF = (TestFactory)containingFolder.TestFactory;

    //Check if the test already exists
    tFilter = testF.Filter;
    qTName = "\"" + testName + "\"";
    tFilter["TS_NAME"] = qTName;
    tList = tFilter.NewList();
    foreach (Test aT in tList)
    {
      if (aT.Name == testName)
      {
        objTest = aT;
        break;
      }
    }

    //If test does not exist, create it
    if (objTest == null)
    {
      objTest = testF.AddItem(DBNull.Value);
      objTest.Name = testName;
      objTest.Type = testType;

      objTest.Post();
    }

    versionCtl = objTest.VCS;
    versionCtl.Refresh();

    bIsLocked = versionCtl.IsLocked;
    strLockedBy = versionCtl.LockedBy;

    //After POST, Test is checked in.
    tempStr = String.Format("Version is locked: {0}", bIsLocked);
    Debug.Print(tempStr);  //Is locked: False
    tempStr = String.Format("Version locked by: \"{0}\"", strLockedBy);
    Debug.Print(tempStr);  //Is locked by: ""

    versionCtl.CheckOut(Convert.ToString("-1"), "To change state", true);
    versionCtl.Refresh();

    bIsLocked = versionCtl.IsLocked;
    strLockedBy = versionCtl.LockedBy;

    tempStr = String.Format("Version is locked: {0}", bIsLocked);
    Debug.Print(tempStr); //Is locked: True
    
    tempStr = String.Format("Version locked by: \"{0}\"", strLockedBy);
    Debug.Print(tempStr); //Is locked by: "User1"

    //Take an arbitrary field to change.
    tempStr = String.Format("Status: \"{0}\"", objTest["TS_STATUS"]);
    Debug.Print(tempStr);

    objTest["TS_STATUS"] = "Ready";
    objTest.Post();

    versionCtl.CheckIn("", "Changed status");
    versionCtl.Refresh();

    bIsLocked = versionCtl.IsLocked;
    strLockedBy = versionCtl.LockedBy;

    tempStr = String.Format("Version is locked: {0}", bIsLocked);
    Debug.Print(tempStr);
    //Is locked: False
    tempStr = String.Format("Version locked by: \"{0}\"", strLockedBy);
    Debug.Print(tempStr);
    //Is locked by: ""

    return objTest;
  }
  catch (Exception)
  {
    return null;
  }
}