RxJavaObservablePlugins.lockdown(); try { assertTrue(RxJavaObservablePlugins.isLockdown()); Consumer a1 = Functions.emptyConsumer(); Callable f0 = new Callable() { RxJavaObservablePlugins.unlock(); RxJavaObservablePlugins.reset(); assertFalse(RxJavaObservablePlugins.isLockdown());