public void Average_ArgumentChecking()
{
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <int>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <double>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <float>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <decimal>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <long>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <int?>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <double?>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <float?>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <decimal?>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <long?>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default(double)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default(float)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default(decimal)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default(long)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default(int?)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default(double?)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default(float?)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default(decimal?)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(default(IObservable <DateTime>), _ => default(long?)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default(Func <DateTime, double>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default(Func <DateTime, float>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default(Func <DateTime, decimal>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default(Func <DateTime, long>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default(Func <DateTime, int?>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default(Func <DateTime, double?>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default(Func <DateTime, float?>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default(Func <DateTime, decimal?>)));
ReactiveAssert.Throws <ArgumentNullException>(() => Observable.Average(Observable.Empty <DateTime>(), default(Func <DateTime, long?>)));
}