TestScheduler is provided, advanced the time by the specified duration.TestScheduler is provided, advanced the time by the specified duration.Assert class for Observable.Assert class for Single.AssertObservable for a given Observable.AssertSingle instance for a Single.ListAssert for the failures emitted.ListAssert from the error(s) emitted by the Single.Observable has completed.Single has completed.Observable has *not* completed.Single has *not* completed.ObjectAssert from the value emitted by the Single.ListAssert for the values emitted.