Testing asynchronous systems is not an easy task and is obscured by details such as handling threads, timeouts and concurrency. PleaseWait is a lightweight DSL that allows you to express the expectations of an asynchronous system in a straightforward manner by waiting for conditions to occur. For example:
using static PleaseWait.Dsl;
using static PleaseWait.TimeUnit;
...
[Test]
public void DemonstratePleaseWait()
{
var orange = new Orange();
_ = orange.PeelFastAsync();
// PleaseWait lets you wait until the asynchronous operation completes:
Wait().AtMost(10, SECONDS).Until(() => orange.IsPeeled);
...
}