public async Task Create_Favourite_For_CurrentUser_ReturnsResult()
{
// arrange
session.Returns(await Json.FromFile("data\\favorites\\favorited.txt"));
session.ExpectPost("https://api.twitter.com/1.1/favorites/create.json");
var tweet = new Tweet { Id = 1234 };
var favourite = await session.CreateFavourite(tweet);
Assert.IsNotNull(favourite);
Assert.IsTrue(favourite.Favourited);
}