diff --git a/spec/lib/gitlab/gitaly_client/ref_service_spec.rb b/spec/lib/gitlab/gitaly_client/ref_service_spec.rb
index 400d426c949..0dab39575b9 100644
--- a/spec/lib/gitlab/gitaly_client/ref_service_spec.rb
+++ b/spec/lib/gitlab/gitaly_client/ref_service_spec.rb
@@ -89,6 +89,16 @@ describe Gitlab::GitalyClient::RefService do
     end
   end
 
+  describe '#list_new_blobs' do
+    it 'raises DeadlineExceeded when timeout is too small' do
+      newrev = '54fcc214b94e78d7a41a9a8fe6d87a5e59500e51'
+
+      expect do
+        client.list_new_blobs(newrev, dynamic_timeout: 0.001)
+      end.to raise_error(GRPC::DeadlineExceeded)
+    end
+  end
+
   describe '#local_branches' do
     it 'sends a find_local_branches message' do
       expect_any_instance_of(Gitaly::RefService::Stub)