Introduce tests for "No transaction in progress for @⁠Nested test class"

Since we now officially support the TEST_METHOD ExtensionContextScope
(see gh-35676 and gh-35680), this commit introduces tests which
demonstrate that the issue raised in gh-34576 is no longer an "issue" if
the user indirectly configures the SpringExtension to use the TEST_METHOD
scope via the "junit.jupiter.extensions.testinstantiation.extensioncontextscope.default"
configuration parameter.

spring-test/src/test/java/org/springframework/test/context/orm/jpa/JpaConfig.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2002-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.test.context.orm.jpa;
+
+import javax.sql.DataSource;
+
+import jakarta.persistence.EntityManagerFactory;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.Database;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.test.context.orm.jpa.domain.JpaPersonRepository;
+import org.springframework.test.context.orm.jpa.domain.Person;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+@Configuration(proxyBeanMethods = false)
+@EnableTransactionManagement
+class JpaConfig {
+
+	@Bean
+	JpaPersonRepository personRepository() {
+		return new JpaPersonRepository();
+	}
+
+	@Bean
+	EmbeddedDatabase dataSource() {
+		return new EmbeddedDatabaseBuilder().generateUniqueName(true).build();
+	}
+
+	@Bean
+	JdbcTemplate jdbcTemplate(DataSource dataSource) {
+		return new JdbcTemplate(dataSource);
+	}
+
+	@Bean
+	LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
+		LocalContainerEntityManagerFactoryBean emfb = new LocalContainerEntityManagerFactoryBean();
+		emfb.setDataSource(dataSource);
+		emfb.setPackagesToScan(Person.class.getPackage().getName());
+		HibernateJpaVendorAdapter hibernateJpaVendorAdapter = new HibernateJpaVendorAdapter();
+		hibernateJpaVendorAdapter.setGenerateDdl(true);
+		hibernateJpaVendorAdapter.setDatabase(Database.H2);
+		emfb.setJpaVendorAdapter(hibernateJpaVendorAdapter);
+		return emfb;
+	}
+
+	@Bean
+	JpaTransactionManager transactionManager(EntityManagerFactory emf) {
+		return new JpaTransactionManager(emf);
+	}
+
+}

spring-test/src/test/java/org/springframework/test/context/orm/jpa/JpaEntityListenerTests.java

@@ -18,30 +18,18 @@ package org.springframework.test.context.orm.jpa;
 
 import java.util.List;
 
-import javax.sql.DataSource;
-
 import jakarta.persistence.EntityManager;
-import jakarta.persistence.EntityManagerFactory;
 import jakarta.persistence.PersistenceContext;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
 import org.springframework.jdbc.core.JdbcTemplate;
-import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
-import org.springframework.orm.jpa.JpaTransactionManager;
-import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
-import org.springframework.orm.jpa.vendor.Database;
-import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
 import org.springframework.test.context.jdbc.Sql;
 import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
-import org.springframework.test.context.orm.jpa.domain.JpaPersonRepository;
 import org.springframework.test.context.orm.jpa.domain.Person;
 import org.springframework.test.context.orm.jpa.domain.PersonListener;
 import org.springframework.test.context.orm.jpa.domain.PersonRepository;
-import org.springframework.transaction.annotation.EnableTransactionManagement;
 import org.springframework.transaction.annotation.Transactional;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -55,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @see <a href="https://github.com/spring-projects/spring-framework/issues/28228">issue gh-28228</a>
  * @see org.springframework.test.context.orm.hibernate.HibernateSessionFlushingTests
  */
-@SpringJUnitConfig
+@SpringJUnitConfig(JpaConfig.class)
 @Transactional
 @Sql(statements = "insert into person(id, name) values(0, 'Jane')")
 class JpaEntityListenerTests {
@@ -156,43 +144,4 @@ class JpaEntityListenerTests {
 		}
 	}
 
-
-	@Configuration(proxyBeanMethods = false)
-	@EnableTransactionManagement
-	static class Config {
-
-		@Bean
-		PersonRepository personRepository() {
-			return new JpaPersonRepository();
-		}
-
-		@Bean
-		DataSource dataSource() {
-			return new EmbeddedDatabaseBuilder().generateUniqueName(true).build();
-		}
-
-		@Bean
-		JdbcTemplate jdbcTemplate(DataSource dataSource) {
-			return new JdbcTemplate(dataSource);
-		}
-
-		@Bean
-		LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
-			LocalContainerEntityManagerFactoryBean emfb = new LocalContainerEntityManagerFactoryBean();
-			emfb.setDataSource(dataSource);
-			emfb.setPackagesToScan(Person.class.getPackage().getName());
-			HibernateJpaVendorAdapter hibernateJpaVendorAdapter = new HibernateJpaVendorAdapter();
-			hibernateJpaVendorAdapter.setGenerateDdl(true);
-			hibernateJpaVendorAdapter.setDatabase(Database.HSQL);
-			emfb.setJpaVendorAdapter(hibernateJpaVendorAdapter);
-			return emfb;
-		}
-
-		@Bean
-		JpaTransactionManager transactionManager(EntityManagerFactory emf) {
-			return new JpaTransactionManager(emf);
-		}
-
-	}
-
 }

spring-test/src/test/java/org/springframework/test/context/orm/jpa/JpaPersonRepositoryTests.java

@@ -0,0 +1,98 @@
+/*
+ * Copyright 2002-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.test.context.orm.jpa;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.PersistenceContext;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.TestInstantiationAwareExtension.ExtensionContextScope;
+import org.junit.platform.suite.api.ConfigurationParameter;
+import org.junit.platform.suite.api.SelectClasses;
+import org.junit.platform.suite.api.Suite;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.jdbc.Sql;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+import org.springframework.test.context.orm.jpa.domain.Person;
+import org.springframework.test.context.orm.jpa.domain.PersonRepository;
+import org.springframework.transaction.annotation.Transactional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Test {@link Suite @Suite} which selects a single test class and runs it with
+ * {@link ExtensionContextScope#TEST_METHOD}.
+ *
+ * @author Sam Brannen
+ * @since 6.2.13
+ * @see <a href="https://github.com/spring-projects/spring-framework/issues/34576">issue gh-34576</a>
+ */
+@Suite
+@SelectClasses(JpaPersonRepositoryTests.TestCase.class)
+@ConfigurationParameter(
+	key = ExtensionContextScope.DEFAULT_SCOPE_PROPERTY_NAME,
+	value = "test_method" // If this is changed to "default", NestedTests will fail.
+)
+// Even though this is a @Suite, it is intentionally named JpaPersonRepositoryTests
+// instead of JpaPersonRepositoryTestSuite, so that it is run with the Gradle build
+// due to the "*Tests" naming convention.
+class JpaPersonRepositoryTests {
+
+	/**
+	 * Transactional tests for JPA support with {@link Nested @Nested} test classes.
+	 */
+	@SpringJUnitConfig(JpaConfig.class)
+	@Transactional
+	@Sql(statements = "insert into person(id, name) values(0, 'Jane')")
+	static class TestCase {
+
+		@PersistenceContext
+		EntityManager em;
+
+		@Autowired
+		PersonRepository repo;
+
+
+		@BeforeEach
+		void setup() {
+			em.persist(new Person("John"));
+			em.flush();
+		}
+
+		@Test
+		void findAll() {
+			assertThat(repo.findAll()).map(Person::getName).containsExactlyInAnyOrder("Jane", "John");
+		}
+
+
+		@Nested
+		// Declare a random test property to ensure we get a different ApplicationContext.
+		@TestPropertySource(properties = "nested = true")
+		class NestedTests {
+
+			@Test
+			void findAll() {
+				assertThat(repo.findAll()).map(Person::getName).containsExactlyInAnyOrder("Jane", "John");
+			}
+		}
+
+	}
+
+}

spring-test/src/test/java/org/springframework/test/context/orm/jpa/domain/JpaPersonRepository.java

@@ -16,6 +16,8 @@
 
 package org.springframework.test.context.orm.jpa.domain;
 
+import java.util.List;
+
 import jakarta.persistence.EntityManager;
 import jakarta.persistence.PersistenceContext;
 
@@ -35,6 +37,12 @@ public class JpaPersonRepository implements PersonRepository {
 	@PersistenceContext
 	private EntityManager entityManager;
 
+
+	@Override
+	public List<Person> findAll() {
+		return this.entityManager.createQuery("from Person", Person.class).getResultList();
+	}
+
 	@Override
 	public Person findById(Long id) {
 		return this.entityManager.find(Person.class, id);

spring-test/src/test/java/org/springframework/test/context/orm/jpa/domain/PersonRepository.java

@@ -16,6 +16,8 @@
 
 package org.springframework.test.context.orm.jpa.domain;
 
+import java.util.List;
+
 /**
  * Person repository API.
  *
@@ -24,6 +26,8 @@ package org.springframework.test.context.orm.jpa.domain;
  */
 public interface PersonRepository {
 
+	List<Person> findAll();
+
 	Person findById(Long id);
 
 	Person findByName(String name);