Rename test fixture package in spring-core

See gh-23550

spring-tx/src/test/java/org/springframework/transaction/annotation/AnnotationTransactionAttributeSourceTests.java

@@ -31,7 +31,7 @@ import org.junit.jupiter.api.Test;
 import org.springframework.aop.framework.Advised;
 import org.springframework.aop.framework.ProxyFactory;
 import org.springframework.core.annotation.AnnotationUtils;
-import org.springframework.core.test.fixtures.io.SerializationTestUtils;
+import org.springframework.core.testfixture.io.SerializationTestUtils;
 import org.springframework.tests.transaction.CallCountingTransactionManager;
 import org.springframework.transaction.interceptor.NoRollbackRuleAttribute;
 import org.springframework.transaction.interceptor.RollbackRuleAttribute;

spring-tx/src/test/java/org/springframework/transaction/config/AnnotationDrivenTests.java

@@ -27,7 +27,7 @@ import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
-import org.springframework.core.test.fixtures.io.SerializationTestUtils;
+import org.springframework.core.testfixture.io.SerializationTestUtils;
 import org.springframework.tests.transaction.CallCountingTransactionManager;
 import org.springframework.transaction.support.TransactionSynchronizationManager;
 

spring-tx/src/test/java/org/springframework/transaction/interceptor/TransactionAttributeSourceAdvisorTests.java

@@ -20,7 +20,7 @@ import java.util.Properties;
 
 import org.junit.jupiter.api.Test;
 
-import org.springframework.core.test.fixtures.io.SerializationTestUtils;
+import org.springframework.core.testfixture.io.SerializationTestUtils;
 
 /**
  * @author Rod Johnson

spring-tx/src/test/java/org/springframework/transaction/interceptor/TransactionInterceptorTests.java

@@ -24,7 +24,7 @@ import org.junit.jupiter.api.Test;
 import org.springframework.aop.framework.ProxyFactory;
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
-import org.springframework.core.test.fixtures.io.SerializationTestUtils;
+import org.springframework.core.testfixture.io.SerializationTestUtils;
 import org.springframework.lang.Nullable;
 import org.springframework.transaction.PlatformTransactionManager;
 import org.springframework.transaction.TransactionDefinition;

spring-tx/src/test/java/org/springframework/transaction/support/JtaTransactionManagerSerializationTests.java

@@ -22,7 +22,7 @@ import javax.transaction.UserTransaction;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.context.test.fixtures.jndi.SimpleNamingContextBuilder;
-import org.springframework.core.test.fixtures.io.SerializationTestUtils;
+import org.springframework.core.testfixture.io.SerializationTestUtils;
 import org.springframework.transaction.jta.JtaTransactionManager;
 
 import static org.assertj.core.api.Assertions.assertThat;