diff --git a/spring-web/src/test/java/org/springframework/web/filter/reactive/ServerWebExchangeContextFilterTests.java b/spring-web/src/test/java/org/springframework/web/filter/reactive/ServerWebExchangeContextFilterTests.java
index 62c62b553d6..169f2efe480 100644
--- a/spring-web/src/test/java/org/springframework/web/filter/reactive/ServerWebExchangeContextFilterTests.java
+++ b/spring-web/src/test/java/org/springframework/web/filter/reactive/ServerWebExchangeContextFilterTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.web.filter.reactive;
 
 import java.time.Duration;
@@ -33,10 +34,10 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Unit tests for {@link ServerWebExchangeContextFilter}.
  * @author Rossen Stoyanchev
  */
-public class ServerWebExchangeContextFilterTests {
+class ServerWebExchangeContextFilterTests {
 
 	@Test
-	public void extractServerWebExchangeFromContext() {
+	void extractServerWebExchangeFromContext() {
 		MyService service = new MyService();
 
 		HttpHandler httpHandler = WebHttpHandlerBuilder
@@ -61,7 +62,7 @@ public class ServerWebExchangeContextFilterTests {
 		}
 
 		public Mono<String> service() {
-			return Mono.just("result").subscriberContext(context -> {
+			return Mono.just("result").contextWrite(context -> {
 				ServerWebExchangeContextFilter.get(context).ifPresent(exchangeRef::set);
 				return context;
 			});
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ErrorsMethodArgumentResolverTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ErrorsMethodArgumentResolverTests.java
index 5be02293760..1fcba691ab6 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ErrorsMethodArgumentResolverTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ErrorsMethodArgumentResolverTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@ import java.time.Duration;
 import org.junit.jupiter.api.Test;
 import reactor.core.publisher.Mono;
 import reactor.core.publisher.MonoProcessor;
+import reactor.core.publisher.Sinks;
 
 import org.springframework.core.MethodParameter;
 import org.springframework.core.ReactiveAdapterRegistry;
@@ -42,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
  *
  * @author Rossen Stoyanchev
  */
-public class ErrorsMethodArgumentResolverTests {
+class ErrorsMethodArgumentResolverTests {
 
 	private final ErrorsMethodArgumentResolver resolver =
 			new ErrorsMethodArgumentResolver(ReactiveAdapterRegistry.getSharedInstance());
@@ -56,7 +57,7 @@ public class ErrorsMethodArgumentResolverTests {
 
 
 	@Test
-	public void supports() {
+	void supports() {
 		MethodParameter parameter = this.testMethod.arg(Errors.class);
 		assertThat(this.resolver.supportsParameter(parameter)).isTrue();
 
@@ -71,7 +72,7 @@ public class ErrorsMethodArgumentResolverTests {
 	}
 
 	@Test
-	public void resolve() {
+	void resolve() {
 		BindingResult bindingResult = createBindingResult(new Foo(), "foo");
 		this.bindingContext.getModel().asMap().put(BindingResult.MODEL_KEY_PREFIX + "foo", bindingResult);
 
@@ -88,9 +89,9 @@ public class ErrorsMethodArgumentResolverTests {
 	}
 
 	@Test
-	public void resolveWithMono() {
+	void resolveWithMono() {
 		BindingResult bindingResult = createBindingResult(new Foo(), "foo");
-		MonoProcessor<BindingResult> monoProcessor = MonoProcessor.create();
+		MonoProcessor<BindingResult> monoProcessor = MonoProcessor.fromSink(Sinks.one());
 		monoProcessor.onNext(bindingResult);
 		this.bindingContext.getModel().asMap().put(BindingResult.MODEL_KEY_PREFIX + "foo", monoProcessor);
 
@@ -102,7 +103,7 @@ public class ErrorsMethodArgumentResolverTests {
 	}
 
 	@Test
-	public void resolveWithMonoOnBindingResultAndModelAttribute() {
+	void resolveWithMonoOnBindingResultAndModelAttribute() {
 		MethodParameter parameter = this.testMethod.arg(BindingResult.class);
 		assertThatIllegalStateException().isThrownBy(() ->
 				this.resolver.resolveArgument(parameter, this.bindingContext, this.exchange)
@@ -112,7 +113,7 @@ public class ErrorsMethodArgumentResolverTests {
 	}
 
 	@Test  // SPR-16187
-	public void resolveWithBindingResultNotFound() {
+	void resolveWithBindingResultNotFound() {
 		MethodParameter parameter = this.testMethod.arg(Errors.class);
 		assertThatIllegalStateException().isThrownBy(() ->
 				this.resolver.resolveArgument(parameter, this.bindingContext, this.exchange)
diff --git a/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ReactiveTypeHandlerTests.java b/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ReactiveTypeHandlerTests.java
index 8b2a4f7fa95..dbd26329286 100644
--- a/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ReactiveTypeHandlerTests.java
+++ b/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ReactiveTypeHandlerTests.java
@@ -125,7 +125,7 @@ public class ReactiveTypeHandlerTests {
 
 	@Test
 	public void deferredResultSubscriberWithNoValues() throws Exception {
-		MonoProcessor<String> monoEmpty = MonoProcessor.create();
+		MonoProcessor<String> monoEmpty = MonoProcessor.fromSink(Sinks.one());
 		testDeferredResultSubscriber(monoEmpty, Mono.class, forClass(String.class), monoEmpty::onComplete, null);
 	}
 
@@ -152,7 +152,7 @@ public class ReactiveTypeHandlerTests {
 		IllegalStateException ex = new IllegalStateException();
 
 		// Mono
-		MonoProcessor<String> mono = MonoProcessor.create();
+		MonoProcessor<String> mono = MonoProcessor.fromSink(Sinks.one());
 		testDeferredResultSubscriber(mono, Mono.class, forClass(String.class), () -> mono.onError(ex), ex);
 
 		// RxJava Single