Fix DataNeo4jTestReactiveIntegrationTests

See gh-22940

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/data/neo4j/DataNeo4jTestReactiveIntegrationTests.java

@@ -19,6 +19,7 @@ package org.springframework.boot.test.autoconfigure.data.neo4j;
 import java.time.Duration;
 
 import org.junit.jupiter.api.Test;
+import org.neo4j.driver.Driver;
 import org.testcontainers.containers.Neo4jContainer;
 import org.testcontainers.junit.jupiter.Container;
 import org.testcontainers.junit.jupiter.Testcontainers;
@@ -27,8 +28,13 @@ import reactor.test.StepVerifier;
 
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.TestConfiguration;
 import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.data.neo4j.core.DatabaseSelectionProvider;
 import org.springframework.data.neo4j.core.ReactiveNeo4jTemplate;
+import org.springframework.data.neo4j.core.transaction.Neo4jTransactionManager;
+import org.springframework.data.neo4j.repository.config.ReactiveNeo4jRepositoryConfigurationExtension;
 import org.springframework.test.context.DynamicPropertyRegistry;
 import org.springframework.test.context.DynamicPropertySource;
 
@@ -38,6 +44,7 @@ import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  * Integration tests for the reactive SDN/RX Neo4j test slice.
  *
  * @author Michael J. Simons
+ * @author Scott Frederick
  * @since 2.4.0
  */
 @DataNeo4jTest
@@ -75,4 +82,20 @@ class DataNeo4jTestReactiveIntegrationTests {
 				.isThrownBy(() -> this.applicationContext.getBean(ExampleService.class));
 	}
 
+	// Providing this bean fulfills a requirement that a @Transactional test has a
+	// PlatformTransactionManager in the app context (enforced by
+	// org.springframework.test.context.transaction.TransactionalTestExecutionListener).
+	// Providing a ReactiveNeo4jTransactionManager would be more appropriate, but won't
+	// allow the test to succeed.
+	@TestConfiguration(proxyBeanMethods = false)
+	static class ReactiveTransactionManagerConfiguration {
+
+		@Bean(ReactiveNeo4jRepositoryConfigurationExtension.DEFAULT_TRANSACTION_MANAGER_BEAN_NAME)
+		Neo4jTransactionManager reactiveTransactionManager(Driver driver,
+				DatabaseSelectionProvider databaseNameProvider) {
+			return new Neo4jTransactionManager(driver, databaseNameProvider);
+		}
+
+	}
+
 }