Polish "Improve Spring Session auto-configuration tests"

See gh-11063

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/session/MongoSessionConfiguration.java

@@ -27,6 +27,7 @@ import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.data.mongodb.core.MongoOperations;
 import org.springframework.session.SessionRepository;
+import org.springframework.session.data.mongo.MongoOperationsSessionRepository;
 import org.springframework.session.data.mongo.config.annotation.web.http.MongoHttpSessionConfiguration;
 
 /**
@@ -36,7 +37,7 @@ import org.springframework.session.data.mongo.config.annotation.web.http.MongoHt
  * @author Stephane Nicoll
  */
 @Configuration
-@ConditionalOnClass(MongoHttpSessionConfiguration.class)
+@ConditionalOnClass({ MongoOperations.class, MongoOperationsSessionRepository.class })
 @ConditionalOnMissingBean(SessionRepository.class)
 @ConditionalOnBean(MongoOperations.class)
 @Conditional(ServletSessionCondition.class)