public void Fused_Basic()
 {
     ObservableSource.FromEnumerable(Enumerable.Range(1, 5))
     .Test(fusionMode: FusionSupport.Any)
     .AssertFuseable()
     .AssertFusionMode(FusionSupport.Sync)
     .AssertResult(1, 2, 3, 4, 5);
 }