//[ClassInitialize()]
 //public static void MyClassInitialize(TestContext testContext)
 //{
 //    TestConstants.CreateTestDir();
 //}
 //[ClassCleanup()]
 //public static void MyClassCleanup()
 //{
 //    TestConstants.DeleteTestDir();
 //}
 private IPersistentArrayNextSpace InitPA(String name, int eleSize, int uHeaderSize)
 {
     PersistentNextSpaceArray array;
     try
     {
         array = new PersistentNextSpaceArray(name, eleSize, uHeaderSize);
     }
     catch (FileNameConflictException)
     {
         array = new PersistentNextSpaceArray(name);
         array.Delete();
         array = new PersistentNextSpaceArray(name, eleSize, uHeaderSize);
     }
     return array;
 }