Abstract auto merge processes

We have one auto merge strategy today - Merge When Pipeline
Succeeds.

In order to add more strategies for Merge Train feature,
we abstract the architecture to be more extensible.

Removed arguments

Fix spec

1 files changed, 3 insertions, 2 deletions

diff --git a/spec/services/merge_requests/push_options_handler_service_spec.rb b/spec/services/merge_requests/push_options_handler_service_spec.rb
index f7a39bb42d5..54b9c6dae38 100644
--- a/spec/services/merge_requests/push_options_handler_service_spec.rb
+++ b/spec/services/merge_requests/push_options_handler_service_spec.rb
@@ -76,10 +76,11 @@ describe MergeRequests::PushOptionsHandlerService do
   shared_examples_for 'a service that can set the merge request to merge when pipeline succeeds' do
     subject(:last_mr) { MergeRequest.last }
 
-    it 'sets merge_when_pipeline_succeeds' do
+    it 'sets auto_merge_enabled' do
       service.execute
 
-      expect(last_mr.merge_when_pipeline_succeeds).to eq(true)
+      expect(last_mr.auto_merge_enabled).to eq(true)
+      expect(last_mr.auto_merge_strategy).to eq(AutoMergeService::STRATEGY_MERGE_WHEN_PIPELINE_SUCCEEDS)
     end
 
     it 'sets merge_user to the user' do