Test that ConnectionFactoryUnwrapper works without pooled-jms jar

Closes gh-41583

Author: philwebb

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jms/ConnectionFactoryUnwrapperTests.java

@@ -20,8 +20,10 @@
 import org.junit.jupiter.api.Test;
 import org.messaginghub.pooled.jms.JmsPoolConnectionFactory;
 
+import org.springframework.boot.testsupport.classpath.ClassPathExclusions;
 import org.springframework.jms.connection.CachingConnectionFactory;
 import org.springframework.jms.connection.SingleConnectionFactory;
+import org.springframework.util.ClassUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.mock;
@@ -79,4 +81,13 @@ void unwrapWithNestedJmsPoolConnectionFactories() {
 		assertThat(ConnectionFactoryUnwrapper.unwrap(secondPooledConnectionFactory)).isSameAs(connectionFactory);
 	}
 
+	@Test
+	@ClassPathExclusions("pooled-jms-*")
+	void unwrapWithoutJmsPoolOnClasspath() {
+		assertThat(ClassUtils.isPresent("org.messaginghub.pooled.jms.JmsPoolConnectionFactory", null)).isFalse();
+		ConnectionFactory connectionFactory = mock(ConnectionFactory.class);
+		assertThat(ConnectionFactoryUnwrapper.unwrap(new CachingConnectionFactory(connectionFactory)))
+			.isSameAs(connectionFactory);
+	}
+
 }