public async Task UpdateSkuTest() { // Arrange var args = new SkuUpdateArguments { SkuId = "sku-id" }; _stripe.Post( Arg.Is <StripeRequest <SkuUpdateArguments, Sku> >(a => a.UrlPath == "skus/" + args.SkuId && a.Model == args), _cancellationToken).Returns(Task.FromResult(new StripeResponse <Sku>())); // Act var response = await _client.UpdateSku(args, _cancellationToken); // Assert response.Should().NotBeNull(); }