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); }