public async Task IdOfNonexistentCustomer_DeleteCustomerOrder_ReturnNotFound() { const int customerId = -1; const int orderId = 8; var exception = await Assert.ThrowsAsync <ProblemDetailsException>(() => _customerController.DeleteCustomerOrder(customerId, orderId)); Assert.Equal(StatusCodes.Status404NotFound, exception.Details.Status); Assert.Contains("customer", exception.Details.Title, StringComparison.OrdinalIgnoreCase); }