void AssertPurchaseOrder(PurchaseOrderObject obj)
 {
    Assert.AreEqual(id, obj.Id);
    Assert.AreEqual(NUMBER, obj.Number);
    Assert.AreEqual(DATE, obj.Date);
    Assert.IsTrue(obj.IsActive);
 }
      public void TestPurchaseOrderObjectCopyConstructor()
      {
         PurchaseOrderObject obj = new PurchaseOrderObject(SetupMock());

         AssertPurchaseOrder(obj);
      }