public async Task IdOfNonexistentSupplier_GetSupplierProducts_ReturnNotFound()
        {
            const int supplierId = -1;

            var exception = await Assert.ThrowsAsync <ProblemDetailsException>(() =>
                                                                               _suppliersController.GetSupplierProducts(supplierId));

            Assert.Equal(StatusCodes.Status404NotFound, exception.Details.Status);
            Assert.Contains("supplier", exception.Details.Title, StringComparison.OrdinalIgnoreCase);
        }