Use Gradle test fixture support for spring-core

See gh-23550

spring-webflux/src/test/java/org/springframework/web/reactive/config/ResourceHandlerRegistryTests.java

@@ -28,7 +28,7 @@ import reactor.test.StepVerifier;
 
 import org.springframework.cache.concurrent.ConcurrentMapCache;
 import org.springframework.context.support.GenericApplicationContext;
-import org.springframework.core.io.buffer.support.DataBufferTestUtils;
+import org.springframework.core.test.fixtures.io.buffer.DataBufferTestUtils;
 import org.springframework.http.CacheControl;
 import org.springframework.http.server.PathContainer;
 import org.springframework.mock.http.server.reactive.test.MockServerHttpRequest;

spring-webflux/src/test/java/org/springframework/web/reactive/function/BodyInsertersTests.java

@@ -45,7 +45,7 @@ import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.DataBufferUtils;
 import org.springframework.core.io.buffer.DefaultDataBuffer;
 import org.springframework.core.io.buffer.DefaultDataBufferFactory;
-import org.springframework.core.io.buffer.support.DataBufferTestUtils;
+import org.springframework.core.test.fixtures.io.buffer.DataBufferTestUtils;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpRange;
 import org.springframework.http.ReactiveHttpOutputMessage;

spring-webflux/src/test/java/org/springframework/web/reactive/function/client/ExchangeFilterFunctionsTests.java

@@ -27,7 +27,7 @@ import reactor.test.StepVerifier;
 import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.DataBufferUtils;
 import org.springframework.core.io.buffer.DefaultDataBufferFactory;
-import org.springframework.core.io.buffer.support.DataBufferTestUtils;
+import org.springframework.core.test.fixtures.io.buffer.DataBufferTestUtils;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;

spring-webflux/src/test/java/org/springframework/web/reactive/function/client/WebClientDataBufferAllocatingTests.java

@@ -32,9 +32,9 @@ import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
 
 import org.springframework.core.ParameterizedTypeReference;
-import org.springframework.core.io.buffer.AbstractDataBufferAllocatingTests;
 import org.springframework.core.io.buffer.DataBufferFactory;
 import org.springframework.core.io.buffer.NettyDataBufferFactory;
+import org.springframework.core.test.fixtures.io.buffer.AbstractDataBufferAllocatingTests;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;

spring-webflux/src/test/java/org/springframework/web/reactive/resource/ResourceWebHandlerTests.java

@@ -39,7 +39,7 @@ import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.DataBufferFactory;
 import org.springframework.core.io.buffer.DataBufferUtils;
 import org.springframework.core.io.buffer.DefaultDataBufferFactory;
-import org.springframework.core.io.buffer.support.DataBufferTestUtils;
+import org.springframework.core.test.fixtures.io.buffer.DataBufferTestUtils;
 import org.springframework.http.CacheControl;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/MessageWriterResultHandlerTests.java

@@ -54,7 +54,7 @@ import org.springframework.web.reactive.accept.RequestedContentTypeResolver;
 import org.springframework.web.reactive.accept.RequestedContentTypeResolverBuilder;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.springframework.core.io.buffer.support.DataBufferTestUtils.dumpString;
+import static org.springframework.core.test.fixtures.io.buffer.DataBufferTestUtils.dumpString;
 import static org.springframework.http.MediaType.APPLICATION_JSON;
 import static org.springframework.web.method.ResolvableMethod.on;
 import static org.springframework.web.reactive.HandlerMapping.PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE;

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestPartMethodArgumentResolverTests.java

@@ -33,7 +33,7 @@ import org.springframework.core.MethodParameter;
 import org.springframework.core.ReactiveAdapterRegistry;
 import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.DataBufferUtils;
-import org.springframework.core.io.buffer.support.DataBufferTestUtils;
+import org.springframework.core.test.fixtures.io.buffer.DataBufferTestUtils;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.MediaType;
 import org.springframework.http.client.MultipartBodyBuilder;

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ResponseEntityResultHandlerTests.java

@@ -40,7 +40,7 @@ import org.springframework.core.MethodParameter;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.codec.ByteBufferEncoder;
 import org.springframework.core.codec.CharSequenceEncoder;
-import org.springframework.core.io.buffer.support.DataBufferTestUtils;
+import org.springframework.core.test.fixtures.io.buffer.DataBufferTestUtils;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;

spring-webflux/src/test/java/org/springframework/web/reactive/result/view/HttpMessageWriterViewTests.java

@@ -29,7 +29,7 @@ import reactor.test.StepVerifier;
 
 import org.springframework.core.codec.CharSequenceEncoder;
 import org.springframework.core.io.buffer.DataBuffer;
-import org.springframework.core.io.buffer.support.DataBufferTestUtils;
+import org.springframework.core.test.fixtures.io.buffer.DataBufferTestUtils;
 import org.springframework.http.MediaType;
 import org.springframework.http.codec.json.Jackson2JsonEncoder;
 import org.springframework.http.codec.xml.Jaxb2XmlEncoder;

spring-webflux/src/test/java/org/springframework/web/reactive/result/view/ViewResolutionResultHandlerTests.java

@@ -38,7 +38,7 @@ import org.springframework.core.Ordered;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.DefaultDataBufferFactory;
-import org.springframework.core.io.buffer.support.DataBufferTestUtils;
+import org.springframework.core.test.fixtures.io.buffer.DataBufferTestUtils;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.server.reactive.ServerHttpResponse;

spring-webflux/src/test/java/org/springframework/web/reactive/result/view/ZeroDemandResponse.java

@@ -24,7 +24,7 @@ import reactor.core.publisher.Mono;
 
 import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.DataBufferFactory;
-import org.springframework.core.io.buffer.LeakAwareDataBufferFactory;
+import org.springframework.core.test.fixtures.io.buffer.LeakAwareDataBufferFactory;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseCookie;