public async Task IdOfNonexistentSupplier_UpdateSupplierProduct_ReturnNotFound()
{
const int supplierId = -1;
const int productId = 10;
var productModel = new ProductModel();
var exception = await Assert.ThrowsAsync <ProblemDetailsException>(() =>
_suppliersController.UpdateSupplierProduct(supplierId, productId, productModel));
Assert.Equal(StatusCodes.Status404NotFound, exception.Details.Status);
Assert.Contains("supplier", exception.Details.Title, StringComparison.OrdinalIgnoreCase);
}