From 162a9abb6be6321146e2c63875767176b52490e9 Mon Sep 17 00:00:00 2001
From: Christoph Strobl <cstrobl@vmware.com>
Date: Fri, 10 Sep 2021 10:34:15 +0200
Subject: [PATCH] Prevent sync client from being created in reactive test
 config.

Closes #3817
Original pull request: #3987.
---
 .../mongodb/test/util/MongoTestTemplateConfiguration.java  | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/MongoTestTemplateConfiguration.java b/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/MongoTestTemplateConfiguration.java
index d9489b812..804b2c388 100644
--- a/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/MongoTestTemplateConfiguration.java
+++ b/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/test/util/MongoTestTemplateConfiguration.java
@@ -34,6 +34,7 @@ import org.springframework.data.mongodb.core.convert.DefaultDbRefResolver;
 import org.springframework.data.mongodb.core.convert.MappingMongoConverter;
 import org.springframework.data.mongodb.core.convert.MongoConverter;
 import org.springframework.data.mongodb.core.convert.MongoCustomConversions;
+import org.springframework.data.mongodb.core.convert.NoOpDbRefResolver;
 import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
 import org.springframework.data.mongodb.core.mapping.event.AuditingEventListener;
 import org.springframework.data.mongodb.core.mapping.event.MongoMappingEvent;
@@ -64,7 +65,11 @@ public class MongoTestTemplateConfiguration {
 
 		if (converter == null) {
 
-			converter = new MappingMongoConverter(new DefaultDbRefResolver(databaseFactory()), mappingContext());
+			if(dbFactoryConfig.syncClient != null || syncClient != null) {
+				converter = new MappingMongoConverter(new DefaultDbRefResolver(databaseFactory()), mappingContext());
+			} else {
+				converter = new MappingMongoConverter(NoOpDbRefResolver.INSTANCE, mappingContext());
+			}
 
 			if (mongoConverterConfigurer.customConversions != null) {
 				converter.setCustomConversions(mongoConverterConfigurer.customConversions);