public async Task GetRefundTest() { var id = "ID_VALUE"; _stripe.Get(Arg.Is <StripeRequest <Refund> >(a => a.UrlPath == "refunds/" + id), _cancellationToken).Returns(Task.FromResult(new StripeResponse <Refund>())); var response = await _client.GetRefund(id, _cancellationToken); response.Should().NotBeNull(); }