diff --git a/rxjava/pom.xml b/rxjava/pom.xml
index 6a351d98bd..f22e6a000a 100644
--- a/rxjava/pom.xml
+++ b/rxjava/pom.xml
@@ -31,11 +31,28 @@
             <artifactId>junit</artifactId>
             <version>${junit.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.jayway.awaitility</groupId>
+            <artifactId>awaitility</artifactId>
+            <version>${avaitility.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/org.hamcrest/hamcrest-all -->
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-all</artifactId>
+            <version>${hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+
     </dependencies>
 
     <properties>
         <junit.version>4.12</junit.version>
         <rx.java.version>1.2.5</rx.java.version>
+        <avaitility.version>1.7.0</avaitility.version>
+        <hamcrest.version>1.3</hamcrest.version>
     </properties>
 
 </project>
\ No newline at end of file
diff --git a/rxjava/src/test/java/com/baeldung/rxjava/RxJavaTesting.java b/rxjava/src/test/java/com/baeldung/rxjava/RxJavaTesting.java
new file mode 100644
index 0000000000..67f6e1c2b8
--- /dev/null
+++ b/rxjava/src/test/java/com/baeldung/rxjava/RxJavaTesting.java
@@ -0,0 +1,113 @@
+package com.baeldung.rxjava;
+
+import org.junit.Test;
+import rx.Observable;
+import rx.observers.TestSubscriber;
+import rx.schedulers.TestScheduler;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.assertThat;
+
+
+public class RxJavaTesting {
+    @Test
+    public void givenObservable_whenZip_shouldAssertBlockingInASameThread() {
+        //given
+        List<String> letters = Arrays.asList("A", "B", "C", "D", "E");
+        List<String> results = new ArrayList<>();
+        Observable<String> observable = Observable
+                .from(letters)
+                .zipWith(Observable.range(1, Integer.MAX_VALUE),
+                        (string, index) -> index + "-" + string);
+
+        //when
+        observable.subscribe(results::add);
+
+        //then
+        assertThat(results, notNullValue());
+        assertThat(results, hasSize(5));
+        assertThat(results, hasItems("1-A", "2-B", "3-C", "4-D", "5-E"));
+    }
+
+    @Test
+    public void givenObservable_whenZip_shouldAssertOnTestSubscriber() {
+        //given
+        List<String> letters = Arrays.asList("A", "B", "C", "D", "E");
+        TestSubscriber<String> subscriber = new TestSubscriber<>();
+
+        Observable<String> observable = Observable
+                .from(letters)
+                .zipWith(Observable.range(1, Integer.MAX_VALUE),
+                        ((string, index) -> index + "-" + string));
+
+        //when
+        observable.subscribe(subscriber);
+
+        //then
+        subscriber.assertCompleted();
+        subscriber.assertNoErrors();
+        subscriber.assertValueCount(5);
+        assertThat(subscriber.getOnNextEvents(), hasItems("1-A", "2-B", "3-C", "4-D", "5-E"));
+    }
+
+    @Test
+    public void givenTestObserver_whenExceptionWasThrowsOnObservable_observerShouldGetError() {
+        //given
+        List<String> letters = Arrays.asList("A", "B", "C", "D", "E");
+        TestSubscriber<String> subscriber = new TestSubscriber<>();
+
+
+        Observable<String> observable = Observable
+                .from(letters)
+                .zipWith(Observable.range(1, Integer.MAX_VALUE),
+                        ((string, index) -> index + "-" + string))
+                .concatWith(Observable.error(new RuntimeException("error in Observable")));
+
+        //when
+        observable.subscribe(subscriber);
+
+        //then
+        subscriber.assertError(RuntimeException.class);
+        subscriber.assertNotCompleted();
+    }
+
+    @Test
+    public void givenObservableThatEmitsEventPerSecond_whenUseAdvanceByTime_shouldEmitEventPerSecond() {
+        //given
+        List<String> letters = Arrays.asList("A", "B", "C", "D", "E");
+        TestScheduler scheduler = new TestScheduler();
+        TestSubscriber<String> subscriber = new TestSubscriber<>();
+        Observable<Long> tick = Observable.interval(1, TimeUnit.SECONDS, scheduler);
+
+        Observable<String> observable = Observable.from(letters)
+                .zipWith(tick, (string, index) -> index + "-" + string);
+
+        observable.subscribeOn(scheduler)
+                .subscribe(subscriber);
+
+        //expect
+        subscriber.assertNoValues();
+        subscriber.assertNotCompleted();
+
+        //when
+        scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
+
+        //then
+        subscriber.assertNoErrors();
+        subscriber.assertValueCount(1);
+        subscriber.assertValues("0-A");
+
+        //when
+        scheduler.advanceTimeTo(6, TimeUnit.SECONDS);
+        subscriber.assertCompleted();
+        subscriber.assertNoErrors();
+        subscriber.assertValueCount(5);
+        assertThat(subscriber.getOnNextEvents(), hasItems("0-A", "1-B", "2-C", "3-D", "4-E"));
+    }
+}
+