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