public async Task SetAsyncRtf_ReturnsValueFromAsyncTask()
{
DataPackage dataPackage = new DataPackage();
dataPackage.SetAsyncRtf(async (formatId, deadline) =>
{
await Task.Delay(200);
return "Test RTF";
});
DataPackageView dataPackageView = dataPackage.GetView();
string result = await dataPackageView.GetRtfAsync();
Assert.AreEqual("Test RTF", result);
}