HHH-19846 Drop JUnit 4 usage

Author: dreab8

hibernate-core/src/test/java/org/hibernate/orm/test/serialization/ProxySerializationNoSessionFactoryTest.java

@@ -43,6 +43,7 @@ public void testInitializedProxy() {
 	}
 
 	private void executeTest(boolean initializeProxy) {
+		SessionFactoryRegistry.INSTANCE.clearRegistrations();
 		final Configuration cfg = new Configuration()
 				.setProperty( AvailableSettings.HBM2DDL_AUTO, Action.ACTION_CREATE_THEN_DROP )
 				.addAnnotatedClass( SimpleEntity.class )

hibernate-core/src/test/java/org/hibernate/orm/test/serialization/SessionFactorySerializationTest.java

@@ -13,6 +13,7 @@
 import org.hibernate.testing.orm.junit.BaseUnitTest;
 import org.hibernate.testing.util.ServiceRegistryUtil;
 import org.hibernate.type.SerializationException;
+import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -26,6 +27,11 @@
 public class SessionFactorySerializationTest {
 	public static final String NAME = "mySF";
 
+	@BeforeAll
+	public void clearRegistry() {
+		SessionFactoryRegistry.INSTANCE.clearRegistrations();
+	}
+
 	@Test
 	public void testNamedSessionFactorySerialization() {
 		Configuration cfg = new Configuration()