diff --git a/spring-core/src/test/java/org/springframework/core/codec/StringDecoderTests.java b/spring-core/src/test/java/org/springframework/core/codec/StringDecoderTests.java
index e5593a7be8..df83b60f42 100644
--- a/spring-core/src/test/java/org/springframework/core/codec/StringDecoderTests.java
+++ b/spring-core/src/test/java/org/springframework/core/codec/StringDecoderTests.java
@@ -25,8 +25,6 @@ import java.util.Collections;
 import java.util.List;
 
 import org.junit.jupiter.api.Test;
-import org.reactivestreams.Subscription;
-import reactor.core.publisher.BaseSubscriber;
 import reactor.core.publisher.Flux;
 import reactor.test.StepVerifier;
 
@@ -268,13 +266,4 @@ class StringDecoderTests extends AbstractDecoderTests<StringDecoder> {
 		return buffer;
 	}
 
-
-	private static class SingleRequestSubscriber extends BaseSubscriber<String> {
-
-		@Override
-		protected void hookOnSubscribe(Subscription subscription) {
-			subscription.request(1);
-		}
-	}
-
 }