public async Task SendAsync()
{
var tcs = new TaskCompletionSource <bool>();
await _mt.SendAsync(() => tcs.TrySetResult(true), CancellationToken.None);
tcs.Task.IsCompleted.Should().BeTrue();
var cts = new CancellationTokenSource();
cts.Cancel();
var t = _mt.SendAsync(() => { }, cts.Token);
bool thrown = false;
try {
await t;
} catch (TaskCanceledException) {
thrown = true;
}
t.IsCanceled.Should().BeTrue();
thrown.Should().BeTrue();
}
