diff --git a/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterBuilderTests.java b/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterBuilderTests.java
index f89b559a..7defe7e1 100644
--- a/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterBuilderTests.java
+++ b/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterBuilderTests.java
@@ -43,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class GraphQlTesterBuilderTests extends GraphQlTesterTestSupport {
+class GraphQlTesterBuilderTests extends GraphQlTesterTestSupport {
 
 	private static final String DOCUMENT = "{ Query }";
 
diff --git a/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterTests.java b/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterTests.java
index b45536a1..ac54eb80 100644
--- a/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterTests.java
+++ b/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterTests.java
@@ -42,7 +42,7 @@ import static org.assertj.core.api.Assertions.assertThatThrownBy;
  * @author Rossen Stoyanchev
  * @author Brian Clozel
  */
-public class GraphQlTesterTests extends GraphQlTesterTestSupport {
+class GraphQlTesterTests extends GraphQlTesterTestSupport {
 
 	@Test
 	void missingDocumentByName() {
diff --git a/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/RSocketGraphQlTesterBuilderTests.java b/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/RSocketGraphQlTesterBuilderTests.java
index 48ae5d36..20a46712 100644
--- a/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/RSocketGraphQlTesterBuilderTests.java
+++ b/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/RSocketGraphQlTesterBuilderTests.java
@@ -48,10 +48,10 @@ import org.springframework.util.MimeType;
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
- *
+ * Tests for {@link RSocketGraphQlTester.Builder}.
  * @author Rossen Stoyanchev
  */
-public class RSocketGraphQlTesterBuilderTests {
+class RSocketGraphQlTesterBuilderTests {
 
 	private static final String DOCUMENT = "{ Query }";
 
diff --git a/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/WebGraphQlTesterBuilderTests.java b/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/WebGraphQlTesterBuilderTests.java
index d2340015..cf0e5db9 100644
--- a/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/WebGraphQlTesterBuilderTests.java
+++ b/spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/WebGraphQlTesterBuilderTests.java
@@ -68,7 +68,7 @@ import static org.springframework.web.reactive.function.server.RouterFunctions.r
  *
  * @author Rossen Stoyanchev
  */
-public class WebGraphQlTesterBuilderTests {
+class WebGraphQlTesterBuilderTests {
 
 	private static final String DOCUMENT = "{ Query }";
 
diff --git a/spring-graphql/src/main/java/org/springframework/graphql/execution/ErrorType.java b/spring-graphql/src/main/java/org/springframework/graphql/execution/ErrorType.java
index 05828b51..7dbee661 100644
--- a/spring-graphql/src/main/java/org/springframework/graphql/execution/ErrorType.java
+++ b/spring-graphql/src/main/java/org/springframework/graphql/execution/ErrorType.java
@@ -57,6 +57,6 @@ public enum ErrorType implements ErrorClassification {
 	 * {@link graphql.schema.DataFetcher} encountered an unexpected condition that
 	 * prevented it from fetching the data value.
 	 */
-	INTERNAL_ERROR;
+	INTERNAL_ERROR
 
 }
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/client/DefaultGraphQlClientResponseTests.java b/spring-graphql/src/test/java/org/springframework/graphql/client/DefaultGraphQlClientResponseTests.java
index 52003fe2..85e6bcab 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/client/DefaultGraphQlClientResponseTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/client/DefaultGraphQlClientResponseTests.java
@@ -43,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException
  * Unit tests for {@link DefaultClientGraphQlResponse}.
  * @author Rossen Stoyanchev
  */
-public class DefaultGraphQlClientResponseTests {
+class DefaultGraphQlClientResponseTests {
 
 	private static final ObjectMapper mapper = new ObjectMapper();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/client/GraphQlClientBuilderTests.java b/spring-graphql/src/test/java/org/springframework/graphql/client/GraphQlClientBuilderTests.java
index ac1eaf30..1f595777 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/client/GraphQlClientBuilderTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/client/GraphQlClientBuilderTests.java
@@ -33,7 +33,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class GraphQlClientBuilderTests extends GraphQlClientTestSupport {
+class GraphQlClientBuilderTests extends GraphQlClientTestSupport {
 
 	private static final String DOCUMENT = "{ Query }";
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/client/GraphQlClientTests.java b/spring-graphql/src/test/java/org/springframework/graphql/client/GraphQlClientTests.java
index e1e95fa9..bf95ae00 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/client/GraphQlClientTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/client/GraphQlClientTests.java
@@ -43,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThatThrownBy;
  *
  * @author Rossen Stoyanchev
  */
-public class GraphQlClientTests extends GraphQlClientTestSupport {
+class GraphQlClientTests extends GraphQlClientTestSupport {
 
 	@Test
 	void retrieveEntity() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/client/HttpGraphQlClientProtocolTests.java b/spring-graphql/src/test/java/org/springframework/graphql/client/HttpGraphQlClientProtocolTests.java
index f0f415d9..d8abbd2a 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/client/HttpGraphQlClientProtocolTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/client/HttpGraphQlClientProtocolTests.java
@@ -41,7 +41,7 @@ import static org.junit.jupiter.params.provider.Arguments.arguments;
  *
  * @see <a href="https://graphql.github.io/graphql-over-http/draft/#sec-application-graphql-response-json">GraphQL over HTTP specification</a>
  */
-public class HttpGraphQlClientProtocolTests {
+class HttpGraphQlClientProtocolTests {
 
 	private MockWebServer server;
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/client/HttpSyncGraphQlClientBuilderTests.java b/spring-graphql/src/test/java/org/springframework/graphql/client/HttpSyncGraphQlClientBuilderTests.java
index 0a1e1215..09e52158 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/client/HttpSyncGraphQlClientBuilderTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/client/HttpSyncGraphQlClientBuilderTests.java
@@ -69,7 +69,7 @@ import static org.springframework.web.reactive.function.server.RouterFunctions.r
  *
  * @author Rossen Stoyanchev
  */
-public class HttpSyncGraphQlClientBuilderTests {
+class HttpSyncGraphQlClientBuilderTests {
 
 	private static final String DOCUMENT = "{ Query }";
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/client/RSocketGraphQlClientBuilderTests.java b/spring-graphql/src/test/java/org/springframework/graphql/client/RSocketGraphQlClientBuilderTests.java
index 93df372a..97d39a65 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/client/RSocketGraphQlClientBuilderTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/client/RSocketGraphQlClientBuilderTests.java
@@ -51,7 +51,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class RSocketGraphQlClientBuilderTests {
+class RSocketGraphQlClientBuilderTests {
 
 	private static final String DOCUMENT = "{ Query }";
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/client/RSocketGraphQlTransportTests.java b/spring-graphql/src/test/java/org/springframework/graphql/client/RSocketGraphQlTransportTests.java
index 466e7b06..fcd10732 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/client/RSocketGraphQlTransportTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/client/RSocketGraphQlTransportTests.java
@@ -47,7 +47,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class RSocketGraphQlTransportTests {
+class RSocketGraphQlTransportTests {
 
 	private static final Jackson2JsonEncoder jsonEncoder = new Jackson2JsonEncoder();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/client/WebGraphQlClientBuilderTests.java b/spring-graphql/src/test/java/org/springframework/graphql/client/WebGraphQlClientBuilderTests.java
index 6e27bd55..a70b84c1 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/client/WebGraphQlClientBuilderTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/client/WebGraphQlClientBuilderTests.java
@@ -77,7 +77,7 @@ import static org.springframework.web.reactive.function.server.RouterFunctions.r
  *
  * @author Rossen Stoyanchev
  */
-public class WebGraphQlClientBuilderTests {
+class WebGraphQlClientBuilderTests {
 
 	private static final String DOCUMENT = "{ Query }";
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/client/WebSocketGraphQlTransportTests.java b/spring-graphql/src/test/java/org/springframework/graphql/client/WebSocketGraphQlTransportTests.java
index 9b333d44..125ef69a 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/client/WebSocketGraphQlTransportTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/client/WebSocketGraphQlTransportTests.java
@@ -55,7 +55,7 @@ import static org.mockito.Mockito.mock;
  *
  * @author Rossen Stoyanchev
  */
-public class WebSocketGraphQlTransportTests {
+class WebSocketGraphQlTransportTests {
 
 	private static final Duration TIMEOUT = Duration.ofSeconds(5);
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/federation/EntityMappingInvocationTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/federation/EntityMappingInvocationTests.java
index e51e39fc..554269b1 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/federation/EntityMappingInvocationTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/federation/EntityMappingInvocationTests.java
@@ -62,7 +62,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
  *
  * @author Rossen Stoyanchev
  */
-public class EntityMappingInvocationTests {
+class EntityMappingInvocationTests {
 
 	private static final Resource federationSchema = new ClassPathResource("books/federation-schema.graphqls");
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerConfigurerInterfaceMappingTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerConfigurerInterfaceMappingTests.java
index d6efb561..7a7528f9 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerConfigurerInterfaceMappingTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerConfigurerInterfaceMappingTests.java
@@ -42,7 +42,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Tests for registration of mappings with schema interfaces types.
  * @author Rossen Stoyanchev
  */
-public class AnnotatedControllerConfigurerInterfaceMappingTests {
+class AnnotatedControllerConfigurerInterfaceMappingTests {
 
 	private static final String SCHEMA = """
 			type Query {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerConfigurerTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerConfigurerTests.java
index ccd9db81..9a84eb8e 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerConfigurerTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerConfigurerTests.java
@@ -33,7 +33,7 @@ import static org.mockito.Mockito.mock;
  * @author Rossen Stoyanchev
  * @since 1.2.0
  */
-public class AnnotatedControllerConfigurerTests {
+class AnnotatedControllerConfigurerTests {
 
 	@Test
 	void customArgumentResolvers() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerExceptionResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerExceptionResolverTests.java
index 46260800..8769b047 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerExceptionResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/AnnotatedControllerExceptionResolverTests.java
@@ -50,7 +50,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
  * @author Rossen Stoyanchev
  * @author Brian Clozel
  */
-public class AnnotatedControllerExceptionResolverTests {
+class AnnotatedControllerExceptionResolverTests {
 
 	private final DataFetchingEnvironment environment =
 			DataFetchingEnvironmentImpl.newDataFetchingEnvironment().build();
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingDetectionTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingDetectionTests.java
index fc15eeb0..64df5fbb 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingDetectionTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingDetectionTests.java
@@ -54,7 +54,7 @@ import static org.assertj.core.api.Assertions.assertThatThrownBy;
  * @author Rossen Stoyanchev
  */
 @SuppressWarnings({"rawtypes", "unused"})
-public class BatchMappingDetectionTests {
+class BatchMappingDetectionTests {
 
 	private final BatchLoaderRegistry batchLoaderRegistry = new DefaultBatchLoaderRegistry();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingInvocationTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingInvocationTests.java
index bf66fef9..7b9229b4 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingInvocationTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingInvocationTests.java
@@ -51,7 +51,7 @@ import static org.junit.jupiter.params.provider.Arguments.arguments;
  * @author Rossen Stoyanchev
  */
 @SuppressWarnings("unused")
-public class BatchMappingInvocationTests extends BatchMappingTestSupport {
+class BatchMappingInvocationTests extends BatchMappingTestSupport {
 
 	private static Stream<Arguments> controllers() {
 		return Stream.of(
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingPrincipalMethodArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingPrincipalMethodArgumentResolverTests.java
index 0252b7da..9efa11c6 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingPrincipalMethodArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/BatchMappingPrincipalMethodArgumentResolverTests.java
@@ -52,7 +52,7 @@ import static org.junit.jupiter.params.provider.Arguments.arguments;
  *
  * @author Rossen Stoyanchev
  */
-public class BatchMappingPrincipalMethodArgumentResolverTests extends BatchMappingTestSupport {
+class BatchMappingPrincipalMethodArgumentResolverTests extends BatchMappingTestSupport {
 
 	private final Authentication authentication = new TestingAuthenticationToken(new Object(), new Object());
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/ContextValueMethodArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/ContextValueMethodArgumentResolverTests.java
index 9a2e3639..4f0bffd3 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/ContextValueMethodArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/ContextValueMethodArgumentResolverTests.java
@@ -51,7 +51,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
  * Unit tests for {@link ContextValueMethodArgumentResolver}.
  * @author Rossen Stoyanchev
  */
-public class ContextValueMethodArgumentResolverTests {
+class ContextValueMethodArgumentResolverTests {
 
 	private static final Method method = ClassUtils.getMethod(
 			ContextValueMethodArgumentResolverTests.class, "handle", (Class<?>[]) null);
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataFetcherHandlerMethodTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataFetcherHandlerMethodTests.java
index 7ae6d731..5e40b1ad 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataFetcherHandlerMethodTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataFetcherHandlerMethodTests.java
@@ -49,7 +49,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class DataFetcherHandlerMethodTests {
+class DataFetcherHandlerMethodTests {
 
 	@Test
 	void annotatedMethodsOnInterface() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataFetchingEnvironmentArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataFetchingEnvironmentArgumentResolverTests.java
index c4dc8d6b..e626b8d0 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataFetchingEnvironmentArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataFetchingEnvironmentArgumentResolverTests.java
@@ -36,7 +36,7 @@ import static org.mockito.Mockito.mock;
  * Unit tests for {@link DataFetchingEnvironmentMethodArgumentResolver}.
  * @author Rossen Stoyanchev
  */
-public class DataFetchingEnvironmentArgumentResolverTests {
+class DataFetchingEnvironmentArgumentResolverTests {
 
 	private static final Method handleMethod = ClassUtils.getMethod(
 			DataFetchingEnvironmentArgumentResolverTests.class, "handle", (Class<?>[]) null);
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataLoaderArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataLoaderArgumentResolverTests.java
index c0a0d74f..c4c29743 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataLoaderArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/DataLoaderArgumentResolverTests.java
@@ -40,7 +40,7 @@ import static org.assertj.core.api.Assertions.assertThatThrownBy;
  * Unit tests for {@link DataLoaderMethodArgumentResolver}.
  * @author Rossen Stoyanchev
  */
-public class DataLoaderArgumentResolverTests {
+class DataLoaderArgumentResolverTests {
 
 	private static final Method method = ClassUtils.getMethod(
 			DataLoaderArgumentResolverTests.class, "handle", (Class<?>[]) null);
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/LocalContextValueMethodArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/LocalContextValueMethodArgumentResolverTests.java
index 8b2a3298..e2712f16 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/LocalContextValueMethodArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/LocalContextValueMethodArgumentResolverTests.java
@@ -38,7 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Unit tests for {@link ContextValueMethodArgumentResolver}.
  * @author Rossen Stoyanchev
  */
-public class LocalContextValueMethodArgumentResolverTests {
+class LocalContextValueMethodArgumentResolverTests {
 
 	private static final Method method = ClassUtils.getMethod(
 			LocalContextValueMethodArgumentResolverTests.class, "handle", (Class<?>[]) null);
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/ProjectedPayloadMethodArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/ProjectedPayloadMethodArgumentResolverTests.java
index f375808b..70f08eb0 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/ProjectedPayloadMethodArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/ProjectedPayloadMethodArgumentResolverTests.java
@@ -37,7 +37,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Unit tests for {@link ProjectedPayloadMethodArgumentResolver}.
  * @author Rossen Stoyanchev
  */
-public class ProjectedPayloadMethodArgumentResolverTests extends ArgumentResolverTestSupport {
+class ProjectedPayloadMethodArgumentResolverTests extends ArgumentResolverTestSupport {
 
 	private ProjectedPayloadMethodArgumentResolver resolver;
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingDetectionTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingDetectionTests.java
index 7483668d..e042e041 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingDetectionTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingDetectionTests.java
@@ -46,7 +46,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class SchemaMappingDetectionTests {
+class SchemaMappingDetectionTests {
 
 	@Test
 	void registerWithDefaultCoordinates() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingInvocationTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingInvocationTests.java
index 9f5116fe..816fd50a 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingInvocationTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingInvocationTests.java
@@ -66,7 +66,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Rossen Stoyanchev
  * @author Mark Paluch
  */
-public class SchemaMappingInvocationTests {
+class SchemaMappingInvocationTests {
 
 	@Test
 	void queryWithScalarArgument() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingPaginationTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingPaginationTests.java
index d25cf288..9472ecf7 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingPaginationTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingPaginationTests.java
@@ -44,7 +44,7 @@ import org.springframework.stereotype.Controller;
  * @author Rossen Stoyanchev
  * @author Oliver Drotbohm
  */
-public class SchemaMappingPaginationTests {
+class SchemaMappingPaginationTests {
 
 
 	@Test
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingPrincipalMethodArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingPrincipalMethodArgumentResolverTests.java
index 51a8709b..f2c083b8 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingPrincipalMethodArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SchemaMappingPrincipalMethodArgumentResolverTests.java
@@ -61,7 +61,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class SchemaMappingPrincipalMethodArgumentResolverTests {
+class SchemaMappingPrincipalMethodArgumentResolverTests {
 
 	private final PrincipalMethodArgumentResolver resolver = new PrincipalMethodArgumentResolver();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SortMethodArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SortMethodArgumentResolverTests.java
index aa556d62..8429ef53 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SortMethodArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SortMethodArgumentResolverTests.java
@@ -38,7 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class SortMethodArgumentResolverTests extends ArgumentResolverTestSupport {
+class SortMethodArgumentResolverTests extends ArgumentResolverTestSupport {
 
 	private final SortMethodArgumentResolver resolver = new SortMethodArgumentResolver(new MySortStrategy());
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SourceMethodArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SourceMethodArgumentResolverTests.java
index 9855df84..f8f5ef12 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SourceMethodArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SourceMethodArgumentResolverTests.java
@@ -150,6 +150,6 @@ class SourceMethodArgumentResolverTests extends ArgumentResolverTestSupport {
 	}
 
 	enum Format {
-		PAPERBACK, EBOOK;
+		PAPERBACK, EBOOK
 	}
 }
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SubrangeMethodArgumentResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SubrangeMethodArgumentResolverTests.java
index 3826a23c..d2426d4d 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SubrangeMethodArgumentResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/method/annotation/support/SubrangeMethodArgumentResolverTests.java
@@ -36,7 +36,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Unit tests for {@link SubrangeMethodArgumentResolver}.
  * @author Rossen Stoyanchev
  */
-public class SubrangeMethodArgumentResolverTests extends ArgumentResolverTestSupport {
+class SubrangeMethodArgumentResolverTests extends ArgumentResolverTestSupport {
 
 	private final SubrangeMethodArgumentResolver<MyPosition> resolver =
 			new SubrangeMethodArgumentResolver<>(new MyPositionCursorStrategy());
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/pagination/Base64CursorEncoderTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/pagination/Base64CursorEncoderTests.java
index a530c65f..60920711 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/pagination/Base64CursorEncoderTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/pagination/Base64CursorEncoderTests.java
@@ -25,7 +25,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class Base64CursorEncoderTests {
+class Base64CursorEncoderTests {
 
 	private final Base64CursorEncoder encoder = new Base64CursorEncoder();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/pagination/ConnectionFieldTypeVisitorTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/pagination/ConnectionFieldTypeVisitorTests.java
index 84912e67..f104c5b0 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/pagination/ConnectionFieldTypeVisitorTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/pagination/ConnectionFieldTypeVisitorTests.java
@@ -63,7 +63,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class ConnectionFieldTypeVisitorTests {
+class ConnectionFieldTypeVisitorTests {
 
 
 	@Test
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/query/JsonKeysetCursorStrategyTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/query/JsonKeysetCursorStrategyTests.java
index f8f6c187..a1d3392b 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/query/JsonKeysetCursorStrategyTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/query/JsonKeysetCursorStrategyTests.java
@@ -33,7 +33,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class JsonKeysetCursorStrategyTests {
+class JsonKeysetCursorStrategyTests {
 
 	private final JsonKeysetCursorStrategy cursorStrategy = new JsonKeysetCursorStrategy();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/query/PropertySelectionTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/query/PropertySelectionTests.java
index 3a5762cc..1b26122d 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/query/PropertySelectionTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/query/PropertySelectionTests.java
@@ -35,7 +35,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class PropertySelectionTests {
+class PropertySelectionTests {
 
 	@Test
 	void propertySelectionWithConnection() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/query/RepositoryUtilsTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/query/RepositoryUtilsTests.java
index d3a9db5b..33f030ee 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/query/RepositoryUtilsTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/query/RepositoryUtilsTests.java
@@ -34,7 +34,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Unit tests for {@link RepositoryUtils}.
  */
 @SuppressWarnings("OptionalGetWithoutIsPresent")
-public class RepositoryUtilsTests {
+class RepositoryUtilsTests {
 
 	private final CursorStrategy<ScrollPosition> cursorStrategy = RepositoryUtils.defaultCursorStrategy();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/query/ScrollPositionCursorStrategyTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/query/ScrollPositionCursorStrategyTests.java
index 5f7dec93..c9ff227d 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/query/ScrollPositionCursorStrategyTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/query/ScrollPositionCursorStrategyTests.java
@@ -31,7 +31,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Rossen Stoyanchev
  * @author Oliver Drotbohm
  */
-public class ScrollPositionCursorStrategyTests {
+class ScrollPositionCursorStrategyTests {
 
 	private final ScrollPositionCursorStrategy cursorStrategy = new ScrollPositionCursorStrategy();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/query/ScrollSubrangeTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/query/ScrollSubrangeTests.java
index fab3459b..28c107c6 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/query/ScrollSubrangeTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/query/ScrollSubrangeTests.java
@@ -34,7 +34,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Rossen Stoyanchev
  * @author Oliver Drotbohm
  */
-public class ScrollSubrangeTests {
+class ScrollSubrangeTests {
 
 	@Test
 	void offsetForward() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/query/SliceConnectionAdapterTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/query/SliceConnectionAdapterTests.java
index f2e78a16..7f4e0488 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/query/SliceConnectionAdapterTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/query/SliceConnectionAdapterTests.java
@@ -33,7 +33,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class SliceConnectionAdapterTests {
+class SliceConnectionAdapterTests {
 
 	private final SliceConnectionAdapter adapter = new SliceConnectionAdapter(new ScrollPositionCursorStrategy());
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/data/query/WindowConnectionAdapterTests.java b/spring-graphql/src/test/java/org/springframework/graphql/data/query/WindowConnectionAdapterTests.java
index 0193ff5f..668fc8e7 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/data/query/WindowConnectionAdapterTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/data/query/WindowConnectionAdapterTests.java
@@ -35,7 +35,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Rossen Stoyanchev
  * @author Oliver Drotbohm
  */
-public class WindowConnectionAdapterTests {
+class WindowConnectionAdapterTests {
 
 	private final WindowConnectionAdapter adapter = new WindowConnectionAdapter(new ScrollPositionCursorStrategy());
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/BatchLoadingTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/BatchLoadingTests.java
index 47eca06f..cb7a442a 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/BatchLoadingTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/BatchLoadingTests.java
@@ -42,7 +42,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class BatchLoadingTests {
+class BatchLoadingTests {
 
 	private final BatchLoaderRegistry registry = new DefaultBatchLoaderRegistry();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/ClassNameTypeResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/ClassNameTypeResolverTests.java
index 195e892d..28aae785 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/ClassNameTypeResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/ClassNameTypeResolverTests.java
@@ -33,7 +33,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Rossen Stoyanchev
  * @since 1.0.0
  */
-public class ClassNameTypeResolverTests {
+class ClassNameTypeResolverTests {
 
 	private static final String schema = """
 			type Query {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/CompositeSubscriptionExceptionResolverTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/CompositeSubscriptionExceptionResolverTests.java
index e079acea..3defc9c8 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/CompositeSubscriptionExceptionResolverTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/CompositeSubscriptionExceptionResolverTests.java
@@ -42,7 +42,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Tests for resolving exceptions via {@link SubscriptionExceptionResolver}.
  * @author Rossen Stoyanchev
  */
-public class CompositeSubscriptionExceptionResolverTests {
+class CompositeSubscriptionExceptionResolverTests {
 
 	private static final Duration TIMEOUT = Duration.ofSeconds(5);
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/ConnectionTypeDefinitionConfigurerTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/ConnectionTypeDefinitionConfigurerTests.java
index c1ac2c45..982fd2e3 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/ConnectionTypeDefinitionConfigurerTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/ConnectionTypeDefinitionConfigurerTests.java
@@ -42,7 +42,7 @@ import org.springframework.graphql.ResponseHelper;
  * @author Rossen Stoyanchev
  * @since 1.2.0
  */
-public class ConnectionTypeDefinitionConfigurerTests {
+class ConnectionTypeDefinitionConfigurerTests {
 
 	@Test
 	void connectionTypeGeneration() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/ContextDataFetcherDecoratorTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/ContextDataFetcherDecoratorTests.java
index e41ab704..9424d674 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/ContextDataFetcherDecoratorTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/ContextDataFetcherDecoratorTests.java
@@ -61,7 +61,7 @@ import static org.awaitility.Awaitility.await;
  * @author Brian Clozel
  */
 @SuppressWarnings("ReactiveStreamsUnusedPublisher")
-public class ContextDataFetcherDecoratorTests {
+class ContextDataFetcherDecoratorTests {
 
 	private static final String SCHEMA_CONTENT = """
 			directive @UpperCase on FIELD_DEFINITION \
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultBatchLoaderRegistryTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultBatchLoaderRegistryTests.java
index bc2b0011..fd0bf301 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultBatchLoaderRegistryTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultBatchLoaderRegistryTests.java
@@ -41,7 +41,7 @@ import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
  * Unit tests for {@link DefaultBatchLoaderRegistry}.
  * @author Rossen Stoyanchev
  */
-public class DefaultBatchLoaderRegistryTests {
+class DefaultBatchLoaderRegistryTests {
 
 	private final BatchLoaderRegistry batchLoaderRegistry =
 			new DefaultBatchLoaderRegistry(() -> {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultExecutionGraphQlServiceTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultExecutionGraphQlServiceTests.java
index 7143c695..37dee336 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultExecutionGraphQlServiceTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultExecutionGraphQlServiceTests.java
@@ -42,7 +42,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class DefaultExecutionGraphQlServiceTests {
+class DefaultExecutionGraphQlServiceTests {
 
 	@Test
 	void customDataLoaderRegistry() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultSchemaResourceGraphQlSourceBuilderTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultSchemaResourceGraphQlSourceBuilderTests.java
index 9ffe73bf..2adadb4a 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultSchemaResourceGraphQlSourceBuilderTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/DefaultSchemaResourceGraphQlSourceBuilderTests.java
@@ -47,7 +47,7 @@ import static org.mockito.Mockito.mock;
  *
  * @author Rossen Stoyanchev
  */
-public class DefaultSchemaResourceGraphQlSourceBuilderTests {
+class DefaultSchemaResourceGraphQlSourceBuilderTests {
 
 	@Test // gh-230
 	void duplicateResourcesAreIgnored() {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/ExceptionResolversExceptionHandlerTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/ExceptionResolversExceptionHandlerTests.java
index 35140500..08c55900 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/ExceptionResolversExceptionHandlerTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/ExceptionResolversExceptionHandlerTests.java
@@ -38,7 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Tests for {@link ExceptionResolversExceptionHandler}.
  * @author Rossen Stoyanchev
  */
-public class ExceptionResolversExceptionHandlerTests {
+class ExceptionResolversExceptionHandlerTests {
 
 	private final GraphQlSetup graphQlSetup =
 			GraphQlSetup.schemaContent("type Query { greeting: String }")
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/SchemaMappingInspectorInterfaceTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/SchemaMappingInspectorInterfaceTests.java
index ff60e286..b8c1c8ae 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/SchemaMappingInspectorInterfaceTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/SchemaMappingInspectorInterfaceTests.java
@@ -29,7 +29,7 @@ import org.springframework.stereotype.Controller;
  *
  * @author Rossen Stoyanchev
  */
-public class SchemaMappingInspectorInterfaceTests extends SchemaMappingInspectorTestSupport {
+class SchemaMappingInspectorInterfaceTests extends SchemaMappingInspectorTestSupport {
 
 	private static final String schema = """
 				type Query {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/execution/SchemaMappingInspectorUnionTests.java b/spring-graphql/src/test/java/org/springframework/graphql/execution/SchemaMappingInspectorUnionTests.java
index b60a2ff0..14b40109 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/execution/SchemaMappingInspectorUnionTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/execution/SchemaMappingInspectorUnionTests.java
@@ -30,7 +30,7 @@ import org.springframework.stereotype.Controller;
  *
  * @author Rossen Stoyanchev
  */
-public class SchemaMappingInspectorUnionTests extends SchemaMappingInspectorTestSupport {
+class SchemaMappingInspectorUnionTests extends SchemaMappingInspectorTestSupport {
 
 	private static final String schema = """
 				type Query {
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/GraphQlRSocketHandlerTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/GraphQlRSocketHandlerTests.java
index db0d5a21..ba058b28 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/GraphQlRSocketHandlerTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/GraphQlRSocketHandlerTests.java
@@ -44,7 +44,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Unit tests for {@link GraphQlWebSocketHandler}.
  * @author Rossen Stoyanchev
  */
-public class GraphQlRSocketHandlerTests {
+class GraphQlRSocketHandlerTests {
 
 	private static final Duration TIMEOUT = Duration.ofSeconds(5);
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/WebGraphQlHandlerTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/WebGraphQlHandlerTests.java
index 9f317079..4158f9e4 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/WebGraphQlHandlerTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/WebGraphQlHandlerTests.java
@@ -43,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 /**
  * Tests for {@link WebGraphQlHandler}, common to both HTTP and WebSocket.
  */
-public class WebGraphQlHandlerTests {
+class WebGraphQlHandlerTests {
 
 	private static final WebGraphQlRequest webInput = new WebGraphQlRequest(
 			URI.create("https://abc.org"), new HttpHeaders(), null, null, Collections.emptyMap(),
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/WebGraphQlInterceptorTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/WebGraphQlInterceptorTests.java
index 6d007dbb..466db571 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/WebGraphQlInterceptorTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/WebGraphQlInterceptorTests.java
@@ -38,7 +38,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 /**
  * Unit tests for a {@link WebGraphQlInterceptor} chain.
  */
-public class WebGraphQlInterceptorTests {
+class WebGraphQlInterceptorTests {
 
 	private static final WebGraphQlRequest webRequest = new WebGraphQlRequest(
 			URI.create("http://abc.org"), new HttpHeaders(), null, null, Collections.emptyMap(),
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/support/BearerTokenAuthenticationExtractorTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/support/BearerTokenAuthenticationExtractorTests.java
index 3ca41d54..88076643 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/support/BearerTokenAuthenticationExtractorTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/support/BearerTokenAuthenticationExtractorTests.java
@@ -33,7 +33,7 @@ import static org.assertj.core.api.Assertions.assertThatThrownBy;
  *
  * @author Rossen Stoyanchev
  */
-public class BearerTokenAuthenticationExtractorTests {
+class BearerTokenAuthenticationExtractorTests {
 
 	private static final BearerTokenAuthenticationExtractor extractor = new BearerTokenAuthenticationExtractor();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/AuthenticationWebSocketInterceptorTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/AuthenticationWebSocketInterceptorTests.java
index 626ea033..f583b103 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/AuthenticationWebSocketInterceptorTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/AuthenticationWebSocketInterceptorTests.java
@@ -46,7 +46,7 @@ import static org.springframework.graphql.server.support.BearerTokenAuthenticati
  *
  * @author Rossen Stoyanchev
  */
-public class AuthenticationWebSocketInterceptorTests {
+class AuthenticationWebSocketInterceptorTests {
 
 	private static final String ATTRIBUTE_KEY = AuthenticationWebSocketInterceptor.class.getName() + ".AUTHENTICATION";
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlHttpHandlerTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlHttpHandlerTests.java
index ccd88cff..afebaa18 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlHttpHandlerTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlHttpHandlerTests.java
@@ -57,7 +57,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Tests for {@link GraphQlHttpHandler}.
  * @author Rossen Stoyanchev
  */
-public class GraphQlHttpHandlerTests {
+class GraphQlHttpHandlerTests {
 
 	private static final List<HttpMessageReader<?>> MESSAGE_READERS =
 			List.of(new DecoderHttpMessageReader<>(new Jackson2JsonDecoder()));
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlHttpProtocolTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlHttpProtocolTests.java
index 5def941e..46675d70 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlHttpProtocolTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlHttpProtocolTests.java
@@ -45,7 +45,7 @@ import org.springframework.web.reactive.function.server.ServerResponse;
  *
  * @see <a href="https://graphql.github.io/graphql-over-http/draft/#sec-application-graphql-response-json">GraphQL over HTTP specification</a>
  */
-public class GraphQlHttpProtocolTests {
+class GraphQlHttpProtocolTests {
 
 	private GraphQlSetup greetingSetup = GraphQlSetup.schemaContent("type Query { greeting: String }")
 			.queryFetcher("greeting", (env) -> "Hello");
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlWebSocketHandlerTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlWebSocketHandlerTests.java
index 3d112774..15d218ae 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlWebSocketHandlerTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/webflux/GraphQlWebSocketHandlerTests.java
@@ -65,7 +65,7 @@ import static org.springframework.graphql.server.support.GraphQlWebSocketMessage
 /**
  * Unit tests for {@link GraphQlWebSocketHandler}.
  */
-public class GraphQlWebSocketHandlerTests extends WebSocketHandlerTestSupport {
+class GraphQlWebSocketHandlerTests extends WebSocketHandlerTestSupport {
 
 	private static final Jackson2JsonDecoder decoder = new Jackson2JsonDecoder();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/AuthenticationWebSocketInterceptorTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/AuthenticationWebSocketInterceptorTests.java
index a69f6006..ee18c67e 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/AuthenticationWebSocketInterceptorTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/AuthenticationWebSocketInterceptorTests.java
@@ -46,7 +46,7 @@ import static org.springframework.graphql.server.support.BearerTokenAuthenticati
  *
  * @author Rossen Stoyanchev
  */
-public class AuthenticationWebSocketInterceptorTests {
+class AuthenticationWebSocketInterceptorTests {
 
 	private static final String ATTRIBUTE_KEY = AuthenticationWebSocketInterceptor.class.getName() + ".AUTHENTICATION";
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlHttpHandlerTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlHttpHandlerTests.java
index c7962471..9aa659f5 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlHttpHandlerTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlHttpHandlerTests.java
@@ -55,7 +55,7 @@ import static org.assertj.core.api.Assertions.assertThatNoException;
  * @author Rossen Stoyanchev
  * @author Brian Clozel
  */
-public class GraphQlHttpHandlerTests {
+class GraphQlHttpHandlerTests {
 
 	private static final List<HttpMessageConverter<?>> MESSAGE_READERS =
 			List.of(new MappingJackson2HttpMessageConverter(), new ByteArrayHttpMessageConverter());
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlHttpProtocolTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlHttpProtocolTests.java
index c2591122..17e87c97 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlHttpProtocolTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlHttpProtocolTests.java
@@ -50,7 +50,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @see <a href="https://graphql.github.io/graphql-over-http/draft/#sec-application-graphql-response-json">GraphQL over HTTP specification</a>
  */
-public class GraphQlHttpProtocolTests {
+class GraphQlHttpProtocolTests {
 
 
 	private GraphQlSetup greetingSetup = GraphQlSetup.schemaContent("type Query { greeting: String }")
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlWebSocketHandlerTests.java b/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlWebSocketHandlerTests.java
index 66e3ffd4..f74653c1 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlWebSocketHandlerTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/server/webmvc/GraphQlWebSocketHandlerTests.java
@@ -71,7 +71,7 @@ import static org.springframework.graphql.server.support.GraphQlWebSocketMessage
 /**
  * Unit tests for {@link GraphQlWebSocketHandler}.
  */
-public class GraphQlWebSocketHandlerTests extends WebSocketHandlerTestSupport {
+class GraphQlWebSocketHandlerTests extends WebSocketHandlerTestSupport {
 
 	private static final HttpMessageConverter<?> converter = new MappingJackson2HttpMessageConverter();
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/support/CachingDocumentSourceTests.java b/spring-graphql/src/test/java/org/springframework/graphql/support/CachingDocumentSourceTests.java
index 10df4592..4cc6daeb 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/support/CachingDocumentSourceTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/support/CachingDocumentSourceTests.java
@@ -30,7 +30,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Unit tests for {@link ResourceDocumentSource}.
  * @author Rossen Stoyanchev
  */
-public class CachingDocumentSourceTests {
+class CachingDocumentSourceTests {
 
 	private CachingDocumentSource source;
 
diff --git a/spring-graphql/src/test/java/org/springframework/graphql/support/ResourceDocumentSourceTests.java b/spring-graphql/src/test/java/org/springframework/graphql/support/ResourceDocumentSourceTests.java
index 19916e89..d30cce12 100644
--- a/spring-graphql/src/test/java/org/springframework/graphql/support/ResourceDocumentSourceTests.java
+++ b/spring-graphql/src/test/java/org/springframework/graphql/support/ResourceDocumentSourceTests.java
@@ -31,7 +31,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Unit tests for {@link ResourceDocumentSource}.
  * @author Rossen Stoyanchev
  */
-public class ResourceDocumentSourceTests {
+class ResourceDocumentSourceTests {
 
 	private ResourceDocumentSource source;