Update merge options for auto merge strategies

Currently, merge options is updated on #execute method,
however, we should have #update interface to make it explicit.

1 files changed, 24 insertions, 0 deletions

diff --git a/spec/services/auto_merge_service_spec.rb b/spec/services/auto_merge_service_spec.rb
index d0eefed3150..7e9c412adb3 100644
--- a/spec/services/auto_merge_service_spec.rb
+++ b/spec/services/auto_merge_service_spec.rb
@@ -92,6 +92,30 @@ describe AutoMergeService do
     end
   end
 
+  describe '#update' do
+    subject { service.update(merge_request) }
+
+    context 'when auto merge is enabled' do
+      let(:merge_request) { create(:merge_request, :merge_when_pipeline_succeeds) }
+
+      it 'delegates to a relevant service instance' do
+        expect_next_instance_of(AutoMerge::MergeWhenPipelineSucceedsService) do |service|
+          expect(service).to receive(:update).with(merge_request)
+        end
+
+        subject
+      end
+    end
+
+    context 'when auto merge is not enabled' do
+      let(:merge_request) { create(:merge_request) }
+
+      it 'returns failed' do
+        is_expected.to eq(:failed)
+      end
+    end
+  end
+
   describe '#process' do
     subject { service.process(merge_request) }