@Test public void innerCanFuse() { AssertSubscriber<Integer> ts = AssertSubscriber.create(); ts.requestedFusionMode(Fuseable.ANY); Flux.never().publish(o -> range(1, 5)).subscribe(ts); ts.assertFuseableSource() .assertFusionMode(Fuseable.SYNC) .assertValues(1, 2, 3, 4, 5) .assertComplete() .assertNoError(); }