public async Task Test_await_Task()
{
var sut = new Concurrency();
// async/await pattern is recommended over 'blocking' methods.
// but it forces to reimplement all blocking methods as they return Task or Task<T> type.
await sut.SayAsync("Hi", TimeSpan.FromMilliseconds(5));
// you can also mix Task.Run and blocking method though, it is not recommended.
// await Task.Run(() => sut.Say("Hi", TimeSpan.FromMilliseconds(5)));
var output = sut.Logs.ToArray();
Assert.True(output.All(message => message == "Hi"));
}