public void Remove_ExistingIdPassed_RemovesOneItem()
        {
            // Arrange
            var Id_Existente = 2;
            // Act
            var okResponse = _controller.Remove(Id_Existente);

            // Assert
            Assert.Equal(4, _service.GetAllItems().Count());
        }
        public ActionResult <IEnumerable <CompraItem> > Get()
        {
            var items = _service.GetAllItems();

            return(Ok(items));
        }