diff --git a/spring-core/src/test/java/org/springframework/core/codec/ResourceRegionEncoderTests.java b/spring-core/src/test/java/org/springframework/core/codec/ResourceRegionEncoderTests.java
index 465780eb385..6412af93394 100644
--- a/spring-core/src/test/java/org/springframework/core/codec/ResourceRegionEncoderTests.java
+++ b/spring-core/src/test/java/org/springframework/core/codec/ResourceRegionEncoderTests.java
@@ -63,7 +63,7 @@ class ResourceRegionEncoderTests extends AbstractLeakCheckingTests {
 	}
 
 	@Test
-	void shouldEncodeResourceRegionFileResource() throws Exception {
+	void shouldEncodeResourceRegionFileResource() {
 		ResourceRegion region = new ResourceRegion(
 				new ClassPathResource("ResourceRegionEncoderTests.txt", getClass()), 0, 6);
 		Flux<DataBuffer> result = this.encoder.encode(Mono.just(region), this.bufferFactory,
diff --git a/spring-core/src/testFixtures/java/org/springframework/core/testfixture/io/buffer/AbstractLeakCheckingTests.java b/spring-core/src/testFixtures/java/org/springframework/core/testfixture/io/buffer/AbstractLeakCheckingTests.java
index 061cad5f8e3..348f5dbbecb 100644
--- a/spring-core/src/testFixtures/java/org/springframework/core/testfixture/io/buffer/AbstractLeakCheckingTests.java
+++ b/spring-core/src/testFixtures/java/org/springframework/core/testfixture/io/buffer/AbstractLeakCheckingTests.java
@@ -16,6 +16,8 @@
 
 package org.springframework.core.testfixture.io.buffer;
 
+import java.time.Duration;
+
 import org.junit.jupiter.api.AfterEach;
 
 import org.springframework.core.io.buffer.DataBufferFactory;
@@ -42,7 +44,7 @@ public abstract class AbstractLeakCheckingTests {
 	 */
 	@AfterEach
 	final void checkForLeaks() {
-		this.bufferFactory.checkForLeaks();
+		this.bufferFactory.checkForLeaks(Duration.ofSeconds(1));
 	}
 
 }
diff --git a/spring-core/src/testFixtures/java/org/springframework/core/testfixture/io/buffer/LeakAwareDataBufferFactory.java b/spring-core/src/testFixtures/java/org/springframework/core/testfixture/io/buffer/LeakAwareDataBufferFactory.java
index e038b59f0b7..ebf5df7d8df 100644
--- a/spring-core/src/testFixtures/java/org/springframework/core/testfixture/io/buffer/LeakAwareDataBufferFactory.java
+++ b/spring-core/src/testFixtures/java/org/springframework/core/testfixture/io/buffer/LeakAwareDataBufferFactory.java
@@ -80,13 +80,21 @@ public class LeakAwareDataBufferFactory implements DataBufferFactory {
 	 * method.
 	 */
 	public void checkForLeaks() {
+		checkForLeaks(Duration.ofSeconds(0));
+	}
+
+	/**
+	 * Variant of {@link #checkForLeaks()} with the option to wait for buffer release.
+	 * @param timeout how long to wait for buffers to be released; 0 for no waiting
+	 */
+	public void checkForLeaks(Duration timeout) {
 		this.trackCreated.set(false);
 		Instant start = Instant.now();
 		while (true) {
 			if (this.created.stream().noneMatch(LeakAwareDataBuffer::isAllocated)) {
 				return;
 			}
-			if (Instant.now().isBefore(start.plus(Duration.ofSeconds(5)))) {
+			if (Instant.now().isBefore(start.plus(timeout))) {
 				try {
 					Thread.sleep(50);
 				}