public void EmptyNameTest()
 {
     PersistentNextSpaceArray pnsa=null;
     try
     {
         pnsa = new PersistentNextSpaceArray("", 6, 6);
         Assert.Fail("Should throw exception");
     }
     catch (FileNotFoundException)
     {
         if(pnsa != null)
             pnsa.Close();
     }
 }
 public void NoArrayTest()
 {
     PersistentNextSpaceArray pnsa = null;
     try
     {
         pnsa = new PersistentNextSpaceArray("PADoesntExsist");
         Assert.Fail("Should throw exception");
     }
     catch (FileNotFoundException)
     {
         if(pnsa != null)
             pnsa.Close();
     }
 }