1 files changed, 63 insertions, 0 deletions
diff --git a/spec/workers/merge_requests/delete_source_branch_worker_spec.rb b/spec/workers/merge_requests/delete_source_branch_worker_spec.rb
new file mode 100644
index 00000000000..957adbbbd6e
--- /dev/null
+++ b/spec/workers/merge_requests/delete_source_branch_worker_spec.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe MergeRequests::DeleteSourceBranchWorker do
+  let_it_be(:merge_request) { create(:merge_request) }
+  let_it_be(:user) { create(:user) }
+
+  let(:sha) { merge_request.source_branch_sha }
+  let(:worker) { described_class.new }
+
+  describe '#perform' do
+    context 'with a non-existing merge request' do
+      it 'does nothing' do
+        expect(::Branches::DeleteService).not_to receive(:new)
+        expect(::MergeRequests::RetargetChainService).not_to receive(:new)
+
+        worker.perform(non_existing_record_id, sha, user.id)
+      end
+    end
+
+    context 'with a non-existing user' do
+      it 'does nothing' do
+        expect(::Branches::DeleteService).not_to receive(:new)
+        expect(::MergeRequests::RetargetChainService).not_to receive(:new)
+
+        worker.perform(merge_request.id, sha, non_existing_record_id)
+      end
+    end
+
+    context 'with existing user and merge request' do
+      it 'calls service to delete source branch' do
+        expect_next_instance_of(::Branches::DeleteService) do |instance|
+          expect(instance).to receive(:execute).with(merge_request.source_branch)
+        end
+
+        worker.perform(merge_request.id, sha, user.id)
+      end
+
+      it 'calls service to try retarget merge requests' do
+        expect_next_instance_of(::MergeRequests::RetargetChainService) do |instance|
+          expect(instance).to receive(:execute).with(merge_request)
+        end
+
+        worker.perform(merge_request.id, sha, user.id)
+      end
+
+      context 'source branch sha does not match' do
+        it 'does nothing' do
+          expect(::Branches::DeleteService).not_to receive(:new)
+          expect(::MergeRequests::RetargetChainService).not_to receive(:new)
+
+          worker.perform(merge_request.id, 'new-source-branch-sha', user.id)
+        end
+      end
+    end
+
+    it_behaves_like 'an idempotent worker' do
+      let(:merge_request) { create(:merge_request) }
+      let(:job_args) { [merge_request.id, sha, user.id] }
+    end
+  end
+end