src/main/java/io/reactivex/plugins/RxJavaPlugins.java
public static void reset() {
        setErrorHandler(null);
        setScheduleHandler(null);

        setComputationSchedulerHandler(null);
        setInitComputationSchedulerHandler(null);

        setIoSchedulerHandler(null);
        setInitIoSchedulerHandler(null);

        setSingleSchedulerHandler(null);
        setInitSingleSchedulerHandler(null);

        setNewThreadSchedulerHandler(null);
        setInitNewThreadSchedulerHandler(null);

        setOnFlowableAssembly(null);
        setOnFlowableSubscribe(null);

        setOnObservableAssembly(null);
        setOnObservableSubscribe(null);

        setOnSingleAssembly(null);
        setOnSingleSubscribe(null);

        setOnCompletableAssembly(null);
        setOnCompletableSubscribe(null);

        setOnConnectableFlowableAssembly(null);
        setOnConnectableObservableAssembly(null);

        setOnMaybeAssembly(null);
        setOnMaybeSubscribe(null);

        setOnParallelAssembly(null);

        setFailOnNonBlockingScheduler(false);
        setOnBeforeBlocking(null);
    }
public static void reset() {
        setErrorHandler(null);
        setScheduleHandler(null);

        setComputationSchedulerHandler(null);
        setInitComputationSchedulerHandler(null);

        setIoSchedulerHandler(null);
        setInitIoSchedulerHandler(null);

        setSingleSchedulerHandler(null);
        setInitSingleSchedulerHandler(null);

        setNewThreadSchedulerHandler(null);
        setInitNewThreadSchedulerHandler(null);

        setOnFlowableAssembly(null);
        setOnFlowableSubscribe(null);

        setOnObservableAssembly(null);
        setOnObservableSubscribe(null);

        setOnSingleAssembly(null);
        setOnSingleSubscribe(null);

        setOnCompletableAssembly(null);
        setOnCompletableSubscribe(null);

        setOnConnectableFlowableAssembly(null);
        setOnConnectableObservableAssembly(null);

        setOnMaybeAssembly(null);
        setOnMaybeSubscribe(null);

        setOnParallelAssembly(null);

        setFailOnNonBlockingScheduler(false);
        setOnBeforeBlocking(null);
    }
Removes all handlers and resets to default behavior.