diff --git a/module/spring-boot-http-codec/src/test/java/org/springframework/boot/http/codec/autoconfigure/CodecsAutoConfigurationTests.java b/module/spring-boot-http-codec/src/test/java/org/springframework/boot/http/codec/autoconfigure/CodecsAutoConfigurationTests.java
index 8463f8dcd28..7adc04246ee 100644
--- a/module/spring-boot-http-codec/src/test/java/org/springframework/boot/http/codec/autoconfigure/CodecsAutoConfigurationTests.java
+++ b/module/spring-boot-http-codec/src/test/java/org/springframework/boot/http/codec/autoconfigure/CodecsAutoConfigurationTests.java
@@ -27,6 +27,7 @@ import tools.jackson.databind.json.JsonMapper;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.http.codec.CodecCustomizer;
+import org.springframework.boot.http.codec.autoconfigure.CodecsAutoConfiguration.KotlinxSerializationJsonCodecConfiguration;
 import org.springframework.boot.kotlinx.serialization.json.autoconfigure.KotlinxSerializationJsonAutoConfiguration;
 import org.springframework.boot.test.context.FilteredClassLoader;
 import org.springframework.boot.test.context.assertj.AssertableApplicationContext;
@@ -161,6 +162,17 @@ class CodecsAutoConfigurationTests {
 			});
 	}
 
+	@Test
+	void kotlinSerializationAppliesKotlinxJsonCodecCustomizer() {
+		this.contextRunner.withConfiguration(AutoConfigurations.of(KotlinxSerializationJsonAutoConfiguration.class))
+			.run((context) -> {
+				String kotlinJsonCodeCustomizerBeanName = "kotlinxJsonCodecCustomizer";
+				assertThat(context).hasSingleBean(KotlinxSerializationJsonCodecConfiguration.class)
+					.hasBean(kotlinJsonCodeCustomizerBeanName);
+				assertThat(context.getBean(kotlinJsonCodeCustomizerBeanName)).isInstanceOf(CodecCustomizer.class);
+			});
+	}
+
 	@Test
 	void userProvidedCustomizerCanOverrideKotlinxJsonCodecCustomizer() {
 		this.contextRunner.withUserConfiguration(KotlinxJsonConfiguration.class, CodecCustomizerConfiguration.class)
@@ -171,15 +183,6 @@ class CodecsAutoConfigurationTests {
 			});
 	}
 
-	@Test
-	void applyKotlinxSerializationJsonAutoConfigurationBeforeCodecsAutoConfiguration() {
-		this.contextRunner.withConfiguration(AutoConfigurations.of(KotlinxSerializationJsonAutoConfiguration.class))
-			.run((context) -> {
-				Map<String, CodecCustomizer> codecCustomizers = context.getBeansOfType(CodecCustomizer.class);
-				assertThat(codecCustomizers).containsKey("kotlinxJsonCodecCustomizer");
-			});
-	}
-
 	@SuppressWarnings("unchecked")
 	private <T> T findEncoder(AssertableApplicationContext context, Class<T> encoderClass) {
 		ServerCodecConfigurer configurer = ServerCodecConfigurer.create();