diff --git a/rxjava-2/src/test/java/com/baeldung/rxjava/RxJavaHooksManualTest.java b/rxjava-2/src/test/java/com/baeldung/rxjava/RxJavaHooksManualTest.java
new file mode 100644
index 0000000000..b79fa9af22
--- /dev/null
+++ b/rxjava-2/src/test/java/com/baeldung/rxjava/RxJavaHooksManualTest.java
@@ -0,0 +1,84 @@
+package com.baeldung.rxjava;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.After;
+import org.junit.Test;
+
+import io.reactivex.Observable;
+import io.reactivex.plugins.RxJavaPlugins;
+import io.reactivex.schedulers.Schedulers;
+
+public class RxJavaHooksManualTest {
+
+    private boolean initHookCalled = false;
+    private boolean hookCalled = false;
+    
+    @Test
+    public void givenIOScheduler_whenCalled_shouldExecuteTheHooks() {
+
+        RxJavaPlugins.setInitIoSchedulerHandler((scheduler) -> {
+            initHookCalled = true;
+            return scheduler.call();
+        });
+
+        RxJavaPlugins.setIoSchedulerHandler((scheduler) -> {
+            hookCalled = true;
+            return scheduler;
+        });
+
+        Observable.range(1, 10)
+            .map(v -> v * 2)
+            .subscribeOn(Schedulers.io())
+            .test();
+        assertTrue(hookCalled && initHookCalled);
+    }
+
+    @Test
+    public void givenNewThreadScheduler_whenCalled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setInitNewThreadSchedulerHandler((scheduler) -> {
+            initHookCalled = true;
+            return scheduler.call();
+        });
+
+        RxJavaPlugins.setNewThreadSchedulerHandler((scheduler) -> {
+            hookCalled = true;
+            return scheduler;
+        });
+
+        Observable.range(1, 15)
+            .map(v -> v * 2)
+            .subscribeOn(Schedulers.newThread())
+            .test();
+        assertTrue(hookCalled && initHookCalled);
+    }
+
+    @Test
+    public void givenSingleScheduler_whenCalled_shouldExecuteTheHooks() {
+
+        RxJavaPlugins.setInitSingleSchedulerHandler((scheduler) -> {
+            initHookCalled = true;
+            return scheduler.call();
+        });
+
+        RxJavaPlugins.setSingleSchedulerHandler((scheduler) -> {
+            hookCalled = true;
+            return scheduler;
+        });
+
+        Observable.range(1, 10)
+            .map(v -> v * 2)
+            .subscribeOn(Schedulers.single())
+            .test();
+        assertTrue(hookCalled && initHookCalled);
+
+    }
+    
+    @After
+    public void reset() {
+        hookCalled = false;
+        initHookCalled = false;
+        RxJavaPlugins.reset();
+    }
+}
diff --git a/rxjava-2/src/test/java/com/baeldung/rxjava/RxJavaHooksUnitTest.java b/rxjava-2/src/test/java/com/baeldung/rxjava/RxJavaHooksUnitTest.java
new file mode 100644
index 0000000000..dd4287a4a9
--- /dev/null
+++ b/rxjava-2/src/test/java/com/baeldung/rxjava/RxJavaHooksUnitTest.java
@@ -0,0 +1,244 @@
+package com.baeldung.rxjava;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.After;
+import org.junit.Test;
+
+import io.reactivex.Completable;
+import io.reactivex.Flowable;
+import io.reactivex.Maybe;
+import io.reactivex.Observable;
+import io.reactivex.Single;
+import io.reactivex.flowables.ConnectableFlowable;
+import io.reactivex.observables.ConnectableObservable;
+import io.reactivex.plugins.RxJavaPlugins;
+import io.reactivex.schedulers.Schedulers;
+
+public class RxJavaHooksUnitTest {
+
+    private boolean initHookCalled = false;
+    private boolean hookCalled = false;
+
+    @Test
+    public void givenObservable_whenError_shouldExecuteTheHook() {
+        RxJavaPlugins.setErrorHandler(throwable -> {
+            hookCalled = true;
+        });
+
+        Observable.error(new IllegalStateException())
+            .subscribe();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenCompletable_whenAssembled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnCompletableAssembly(completable -> {
+            hookCalled = true;
+            return completable;
+        });
+        Completable.fromSingle(Single.just(1));
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenCompletable_whenSubscribed_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnCompletableSubscribe((completable, observer) -> {
+            hookCalled = true;
+            return observer;
+        });
+
+        Completable.fromSingle(Single.just(1))
+            .test();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenObservable_whenAssembled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnObservableAssembly(observable -> {
+            hookCalled = true;
+            return observable;
+        });
+
+        Observable.range(1, 10);
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenObservable_whenSubscribed_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnObservableSubscribe((observable, observer) -> {
+            hookCalled = true;
+            return observer;
+        });
+
+        Observable.range(1, 10)
+            .test();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenConnectableObservable_whenAssembled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnConnectableObservableAssembly(connectableObservable -> {
+            hookCalled = true;
+            return connectableObservable;
+        });
+
+        ConnectableObservable.range(1, 10)
+            .publish()
+            .connect();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenFlowable_whenAssembled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnFlowableAssembly(flowable -> {
+            hookCalled = true;
+            return flowable;
+        });
+
+        Flowable.range(1, 10);
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenFlowable_whenSubscribed_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnFlowableSubscribe((flowable, observer) -> {
+            hookCalled = true;
+            return observer;
+        });
+
+        Flowable.range(1, 10)
+            .test();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenConnectableFlowable_whenAssembled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnConnectableFlowableAssembly(connectableFlowable -> {
+            hookCalled = true;
+            return connectableFlowable;
+        });
+
+        ConnectableFlowable.range(1, 10)
+            .publish()
+            .connect();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenParallel_whenAssembled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnParallelAssembly(parallelFlowable -> {
+            hookCalled = true;
+            return parallelFlowable;
+        });
+
+        Flowable.range(1, 10)
+            .parallel();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenMaybe_whenAssembled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnMaybeAssembly(maybe -> {
+            hookCalled = true;
+            return maybe;
+        });
+
+        Maybe.just(1);
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenMaybe_whenSubscribed_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnMaybeSubscribe((maybe, observer) -> {
+            hookCalled = true;
+            return observer;
+        });
+
+        Maybe.just(1)
+            .test();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenSingle_whenAssembled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnSingleAssembly(single -> {
+            hookCalled = true;
+            return single;
+        });
+
+        Single.just(1);
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenSingle_whenSubscribed_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setOnSingleSubscribe((single, observer) -> {
+            hookCalled = true;
+            return observer;
+        });
+
+        Single.just(1)
+            .test();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenAnyScheduler_whenCalled_shouldExecuteTheHook() {
+
+        RxJavaPlugins.setScheduleHandler((runnable) -> {
+            hookCalled = true;
+            return runnable;
+        });
+
+        Observable.range(1, 10)
+            .map(v -> v * 2)
+            .subscribeOn(Schedulers.single())
+            .test();
+        hookCalled = false;
+        Observable.range(1, 10)
+            .map(v -> v * 2)
+            .subscribeOn(Schedulers.computation())
+            .test();
+        assertTrue(hookCalled);
+    }
+
+    @Test
+    public void givenComputationScheduler_whenCalled_shouldExecuteTheHooks() {
+
+        RxJavaPlugins.setInitComputationSchedulerHandler((scheduler) -> {
+            initHookCalled = true;
+            return scheduler.call();
+        });
+        RxJavaPlugins.setComputationSchedulerHandler((scheduler) -> {
+            hookCalled = true;
+            return scheduler;
+        });
+
+        Observable.range(1, 10)
+            .map(v -> v * 2)
+            .subscribeOn(Schedulers.computation())
+            .test();
+        assertTrue(hookCalled && initHookCalled);
+    }
+
+    @After
+    public void reset() {
+        initHookCalled = false;
+        hookCalled = false;
+        RxJavaPlugins.reset();
+    }
+}