public async Task GetSkuTest() { // Arrange var id = "sku-id"; _stripe.Get(Arg.Is <StripeRequest <Sku> >(a => a.UrlPath == "skus/" + id), _cancellationToken) .Returns(Task.FromResult(new StripeResponse <Sku>())); // Act var response = await _client.GetSku(id, _cancellationToken); // Assert response.Should().NotBeNull(); }