Can I use xbehave.net with isolation (faking mocking substitution) libraries?

Of course!

You can use any isolation library you like with xBehave.net. Our recommendation is FakeItEasy.

E.g.

    public class CandyShopFeature
    {
        [Scenario]
        public void BuyingCandy(ICandy lollipop, ICandyShop shop, SweetTooth developer)
        {
            "Given a shop with a top selling candy"
                .Given(() =>
                {
                    lollipop = A.Fake<ICandy>();
                    shop = A.Fake<ICandyShop>();
                    A.CallTo(() => shop.GetTopSellingCandy()).Returns(lollipop);
                });

            "And a sweet tooth developer"
                .And(() => developer = new SweetTooth());

            "When the developer buys the tastiest candy from the shop"
                .When(() => developer.BuyTastiestCandy(shop));

            "Then the developer should have bought the top selling candy"
                .Then(() => A.CallTo(() => shop.BuyCandy(lollipop)).MustHaveHappened());
        }
    }