diff --git a/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutIsolatedTest.java b/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutIsolatedTest.java
new file mode 100644
index 0000000000..b9259a7ecf
--- /dev/null
+++ b/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutIsolatedTest.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2016-present, RxJava Contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is
+ * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
+ * the License for the specific language governing permissions and limitations under the License.
+ */
+
+package io.reactivex.rxjava4.internal.operators.maybe;
+
+import java.util.concurrent.TimeoutException;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.parallel.Isolated;
+
+import io.reactivex.rxjava4.core.RxJavaTest;
+import io.reactivex.rxjava4.exceptions.TestException;
+import io.reactivex.rxjava4.observers.TestObserver;
+import io.reactivex.rxjava4.plugins.RxJavaPlugins;
+import io.reactivex.rxjava4.processors.PublishProcessor;
+import io.reactivex.rxjava4.testsupport.*;
+
+@Isolated
+public class MaybeTimeoutIsolatedTest extends RxJavaTest {
+
+    @Test
+    public void onErrorRace() {
+        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
+            TestHelper.trackPluginErrors();
+            try {
+                final PublishProcessor<Integer> pp1 = PublishProcessor.create();
+                final PublishProcessor<Integer> pp2 = PublishProcessor.create();
+
+                TestObserver<Integer> to = pp1.singleElement().timeout(pp2.singleElement()).test();
+
+                final TestException ex = new TestException();
+
+                Runnable r1 = () -> pp1.onError(ex);
+                Runnable r2 = () -> pp2.onError(ex);
+
+                TestHelper.race(r1, r2);
+
+                to.assertFailure(TestException.class);
+            } finally {
+                RxJavaPlugins.reset();
+            }
+        }
+    }
+
+    @Test
+    public void onCompleteRace() {
+        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
+            final PublishProcessor<Integer> pp1 = PublishProcessor.create();
+            final PublishProcessor<Integer> pp2 = PublishProcessor.create();
+
+            TestObserverEx<Integer> to = pp1.singleElement().timeout(pp2.singleElement()).to(TestHelper.<Integer>testConsumer());
+
+            Runnable r1 = pp1::onComplete;
+            Runnable r2 = pp2::onComplete;
+
+            TestHelper.race(r1, r2);
+
+            to.assertSubscribed().assertNoValues();
+
+            if (!to.errors().isEmpty()) {
+                to.assertError(TimeoutException.class).assertNotComplete();
+            } else {
+                to.assertNoErrors().assertComplete();
+            }
+        }
+    }
+}
diff --git a/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutPublisherIsolatedTest.java b/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutPublisherIsolatedTest.java
new file mode 100644
index 0000000000..72675b0283
--- /dev/null
+++ b/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutPublisherIsolatedTest.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2016-present, RxJava Contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is
+ * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
+ * the License for the specific language governing permissions and limitations under the License.
+ */
+
+package io.reactivex.rxjava4.internal.operators.maybe;
+
+import java.util.concurrent.TimeoutException;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.parallel.Isolated;
+
+import io.reactivex.rxjava4.core.RxJavaTest;
+import io.reactivex.rxjava4.exceptions.TestException;
+import io.reactivex.rxjava4.observers.TestObserver;
+import io.reactivex.rxjava4.plugins.RxJavaPlugins;
+import io.reactivex.rxjava4.processors.PublishProcessor;
+import io.reactivex.rxjava4.testsupport.*;
+
+@Isolated
+public class MaybeTimeoutPublisherIsolatedTest extends RxJavaTest {
+
+    @Test
+    public void onErrorRace() {
+        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
+            TestHelper.trackPluginErrors();
+            try {
+                final PublishProcessor<Integer> pp1 = PublishProcessor.create();
+                final PublishProcessor<Integer> pp2 = PublishProcessor.create();
+
+                TestObserver<Integer> to = pp1.singleElement().timeout(pp2).test();
+
+                final TestException ex = new TestException();
+
+                Runnable r1 = () -> pp1.onError(ex);
+                Runnable r2 = () -> pp2.onError(ex);
+
+                TestHelper.race(r1, r2);
+
+                to.assertFailure(TestException.class);
+            } finally {
+                RxJavaPlugins.reset();
+            }
+        }
+    }
+
+    @Test
+    public void onCompleteRace() {
+        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
+            final PublishProcessor<Integer> pp1 = PublishProcessor.create();
+            final PublishProcessor<Integer> pp2 = PublishProcessor.create();
+
+            TestObserverEx<Integer> to = pp1.singleElement().timeout(pp2).to(TestHelper.<Integer>testConsumer());
+
+            Runnable r1 = pp1::onComplete;
+            Runnable r2 = pp2::onComplete;
+
+            TestHelper.race(r1, r2);
+
+            to.assertSubscribed().assertNoValues();
+
+            if (!to.errors().isEmpty()) {
+                to.assertError(TimeoutException.class).assertNotComplete();
+            } else {
+                to.assertNoErrors().assertComplete();
+            }
+        }
+    }
+}
diff --git a/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutPublisherTest.java b/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutPublisherTest.java
index ae2a83a9fc..d378d6798a 100644
--- a/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutPublisherTest.java
+++ b/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutPublisherTest.java
@@ -24,9 +24,8 @@
 import io.reactivex.rxjava4.disposables.Disposable;
 import io.reactivex.rxjava4.exceptions.TestException;
 import io.reactivex.rxjava4.observers.TestObserver;
-import io.reactivex.rxjava4.plugins.RxJavaPlugins;
 import io.reactivex.rxjava4.processors.PublishProcessor;
-import io.reactivex.rxjava4.testsupport.*;
+import io.reactivex.rxjava4.testsupport.TestHelper;
 
 public class MaybeTimeoutPublisherTest extends RxJavaTest {
 
@@ -156,53 +155,6 @@ public void dispose2() {
         TestHelper.checkDisposed(pp1.singleElement().timeout(pp2, Maybe.just(1)));
     }
 
-    @Test
-    public void onErrorRace() {
-        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
-            TestHelper.trackPluginErrors();
-            try {
-                final PublishProcessor<Integer> pp1 = PublishProcessor.create();
-                final PublishProcessor<Integer> pp2 = PublishProcessor.create();
-
-                TestObserver<Integer> to = pp1.singleElement().timeout(pp2).test();
-
-                final TestException ex = new TestException();
-
-                Runnable r1 = () -> pp1.onError(ex);
-                Runnable r2 = () -> pp2.onError(ex);
-
-                TestHelper.race(r1, r2);
-
-                to.assertFailure(TestException.class);
-            } finally {
-                RxJavaPlugins.reset();
-            }
-        }
-    }
-
-    @Test
-    public void onCompleteRace() {
-        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
-            final PublishProcessor<Integer> pp1 = PublishProcessor.create();
-            final PublishProcessor<Integer> pp2 = PublishProcessor.create();
-
-            TestObserverEx<Integer> to = pp1.singleElement().timeout(pp2).to(TestHelper.<Integer>testConsumer());
-
-            Runnable r1 = pp1::onComplete;
-            Runnable r2 = pp2::onComplete;
-
-            TestHelper.race(r1, r2);
-
-            to.assertSubscribed().assertNoValues();
-
-            if (!to.errors().isEmpty()) {
-                to.assertError(TimeoutException.class).assertNotComplete();
-            } else {
-                to.assertNoErrors().assertComplete();
-            }
-        }
-    }
-
     @Test
     public void badSourceOther() {
         TestHelper.checkBadSourceFlowable(f -> Maybe.never().timeout(f, Maybe.just(1)), false, null, 1, 1);
diff --git a/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutTest.java b/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutTest.java
index 2153cbb6f3..669d7020f9 100644
--- a/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutTest.java
+++ b/src/test/java/io/reactivex/rxjava4/internal/operators/maybe/MaybeTimeoutTest.java
@@ -24,11 +24,10 @@
 import io.reactivex.rxjava4.disposables.Disposable;
 import io.reactivex.rxjava4.exceptions.TestException;
 import io.reactivex.rxjava4.observers.TestObserver;
-import io.reactivex.rxjava4.plugins.RxJavaPlugins;
 import io.reactivex.rxjava4.processors.PublishProcessor;
 import io.reactivex.rxjava4.schedulers.Schedulers;
 import io.reactivex.rxjava4.subjects.MaybeSubject;
-import io.reactivex.rxjava4.testsupport.*;
+import io.reactivex.rxjava4.testsupport.TestHelper;
 
 public class MaybeTimeoutTest extends RxJavaTest {
 
@@ -278,53 +277,6 @@ public void dispose2() {
         TestHelper.checkDisposed(pp1.singleElement().timeout(pp2.singleElement(), Maybe.just(1)));
     }
 
-    @Test
-    public void onErrorRace() {
-        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
-            TestHelper.trackPluginErrors();
-            try {
-                final PublishProcessor<Integer> pp1 = PublishProcessor.create();
-                final PublishProcessor<Integer> pp2 = PublishProcessor.create();
-
-                TestObserver<Integer> to = pp1.singleElement().timeout(pp2.singleElement()).test();
-
-                final TestException ex = new TestException();
-
-                Runnable r1 = () -> pp1.onError(ex);
-                Runnable r2 = () -> pp2.onError(ex);
-
-                TestHelper.race(r1, r2);
-
-                to.assertFailure(TestException.class);
-            } finally {
-                RxJavaPlugins.reset();
-            }
-        }
-    }
-
-    @Test
-    public void onCompleteRace() {
-        for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
-            final PublishProcessor<Integer> pp1 = PublishProcessor.create();
-            final PublishProcessor<Integer> pp2 = PublishProcessor.create();
-
-            TestObserverEx<Integer> to = pp1.singleElement().timeout(pp2.singleElement()).to(TestHelper.<Integer>testConsumer());
-
-            Runnable r1 = pp1::onComplete;
-            Runnable r2 = pp2::onComplete;
-
-            TestHelper.race(r1, r2);
-
-            to.assertSubscribed().assertNoValues();
-
-            if (!to.errors().isEmpty()) {
-                to.assertError(TimeoutException.class).assertNotComplete();
-            } else {
-                to.assertNoErrors().assertComplete();
-            }
-        }
-    }
-
     @Test
     public void mainSuccessAfterOtherSignal() {
         MaybeSubject<Integer> ms = MaybeSubject.create();