public async Task CreateCardTokenTest() { // Arrange var args = new CardTokenCreateArguments(); _stripe.Post( Arg.Is <StripeRequest <CardTokenCreateArguments, Token> >(a => a.UrlPath == "tokens" && a.Model == args), _cancellationToken).Returns(Task.FromResult(new StripeResponse <Token>())); // Act var response = await _client.CreateCardToken(args, _cancellationToken); // Assert response.Should().NotBeNull(); }