diff --git a/spec/serializers/topic_view_serializer_spec.rb b/spec/serializers/topic_view_serializer_spec.rb
index ac256d27928..a1be88f7800 100644
--- a/spec/serializers/topic_view_serializer_spec.rb
+++ b/spec/serializers/topic_view_serializer_spec.rb
@@ -57,7 +57,7 @@ describe TopicViewSerializer do
         expect(json[:image_url]).to end_with(image_upload.url)
       end
 
-      it 'should have thumbnails' do
+      it 'should have thumbnail jobs enqueued' do
         SiteSetting.create_thumbnails = true
 
         Discourse.redis.del(topic.thumbnail_job_redis_key(Topic.thumbnail_sizes))
@@ -72,6 +72,16 @@ describe TopicViewSerializer do
         expect do
           json = serialize_topic(topic, user)
         end.to change { Jobs::GenerateTopicThumbnails.jobs.size }.by(0)
+      end
+
+      it 'should have thumbnails after jobs run' do
+        Jobs.run_immediately!
+        SiteSetting.create_thumbnails = true
+
+        Discourse.redis.del(topic.thumbnail_job_redis_key(Topic.thumbnail_sizes))
+        json = serialize_topic(topic, user)
+        topic.generate_thumbnails!
+        json = serialize_topic(topic, user)
 
         # Original + Optimized
         expect(json[:thumbnails].length).to eq(2)