Have unit tests extends RxJavaTest - 3 (#6595)

This commit updates the unit tests of the following operators:
* single
* subjects
* subscribers
And for internal operators:
* internal.disposable
* internal.fuctions
* internal.observers
* internal.queue
* interanl.schedulers
* internal.subscribers
* internal.subscriptions
* internal.operator.completable

Related: #6583

Author: RomanWuattier

src/test/java/io/reactivex/BackpressureEnumTest.java

@@ -21,7 +21,7 @@
 
 import io.reactivex.annotations.BackpressureKind;
 
-public class BackpressureEnumTest {
+public class BackpressureEnumTest extends RxJavaTest {
 
     @Test
     public void backpressureOverflowStrategy() {

src/test/java/io/reactivex/ConverterTest.java

@@ -20,7 +20,7 @@
 import io.reactivex.exceptions.TestException;
 import io.reactivex.parallel.*;
 
-public final class ConverterTest {
+public final class ConverterTest extends RxJavaTest {
 
     @Test
     public void flowableConverterThrows() {

src/test/java/io/reactivex/NotificationTest.java

@@ -19,7 +19,7 @@
 
 import io.reactivex.exceptions.TestException;
 
-public class NotificationTest {
+public class NotificationTest extends RxJavaTest {
 
     @Test
     public void valueOfOnErrorIsNull() {

src/test/java/io/reactivex/TransformerTest.java

@@ -19,7 +19,7 @@
 
 import static org.junit.Assert.*;
 
-public class TransformerTest {
+public class TransformerTest extends RxJavaTest {
 
     @Test
     public void flowableTransformerThrows() {

src/test/java/io/reactivex/XFlatMapTest.java

@@ -29,7 +29,7 @@
 import io.reactivex.subscribers.TestSubscriber;
 import io.reactivex.testsupport.TestHelper;
 
-public class XFlatMapTest {
+public class XFlatMapTest extends RxJavaTest {
 
     @Rule
     public Retry retry = new Retry(5, 1000, true);

src/test/java/io/reactivex/internal/SubscribeWithTest.java

@@ -21,7 +21,7 @@
 import io.reactivex.observers.TestObserver;
 import io.reactivex.subscribers.TestSubscriber;
 
-public class SubscribeWithTest {
+public class SubscribeWithTest extends RxJavaTest {
 
     @Test
     public void withFlowable() {

src/test/java/io/reactivex/internal/disposables/ArrayCompositeDisposableTest.java

@@ -15,12 +15,13 @@
 
 import static org.junit.Assert.*;
 
+import io.reactivex.RxJavaTest;
 import org.junit.Test;
 
 import io.reactivex.disposables.*;
 import io.reactivex.testsupport.TestHelper;
 
-public class ArrayCompositeDisposableTest {
+public class ArrayCompositeDisposableTest extends RxJavaTest {
 
     @Test
     public void normal() {

src/test/java/io/reactivex/internal/disposables/CancellableDisposableTest.java

@@ -18,14 +18,15 @@
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import io.reactivex.RxJavaTest;
 import org.junit.Test;
 
 import io.reactivex.exceptions.TestException;
 import io.reactivex.functions.Cancellable;
 import io.reactivex.plugins.RxJavaPlugins;
 import io.reactivex.testsupport.TestHelper;
 
-public class CancellableDisposableTest {
+public class CancellableDisposableTest extends RxJavaTest {
 
     @Test
     public void normal() {

src/test/java/io/reactivex/internal/disposables/DisposableHelperTest.java

@@ -18,13 +18,14 @@
 import java.util.List;
 import java.util.concurrent.atomic.AtomicReference;
 
+import io.reactivex.RxJavaTest;
 import org.junit.Test;
 
 import io.reactivex.disposables.*;
 import io.reactivex.plugins.RxJavaPlugins;
 import io.reactivex.testsupport.TestHelper;
 
-public class DisposableHelperTest {
+public class DisposableHelperTest extends RxJavaTest {
     @Test
     public void enumMethods() {
         assertEquals(1, DisposableHelper.values().length);

src/test/java/io/reactivex/internal/disposables/EmptyDisposableTest.java

@@ -15,12 +15,13 @@
 
 import static org.junit.Assert.*;
 
+import io.reactivex.RxJavaTest;
 import org.junit.Test;
 
 import io.reactivex.internal.fuseable.*;
 import io.reactivex.testsupport.TestHelper;
 
-public class EmptyDisposableTest {
+public class EmptyDisposableTest extends RxJavaTest {
 
     @Test
     public void noOffer() {