1 files changed, 42 insertions, 0 deletions
diff --git a/spec/services/merge_requests/pushed_branches_service_spec.rb b/spec/services/merge_requests/pushed_branches_service_spec.rb
new file mode 100644
index 00000000000..7b5d505f4d9
--- /dev/null
+++ b/spec/services/merge_requests/pushed_branches_service_spec.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe MergeRequests::PushedBranchesService do
+  let(:project) { create(:project) }
+  let!(:service) { described_class.new(project, nil, changes: pushed_branches) }
+
+  context 'when branches pushed' do
+    let(:pushed_branches) do
+      %w(branch1 branch2 extra1 extra2 extra3).map do |branch|
+        { ref: "refs/heads/#{branch}" }
+      end
+    end
+
+    it 'returns only branches which have a merge request' do
+      create(:merge_request, source_branch: 'branch1', source_project: project)
+      create(:merge_request, source_branch: 'branch2', source_project: project)
+      create(:merge_request, target_branch: 'branch2', source_project: project)
+      create(:merge_request, :closed, target_branch: 'extra1', source_project: project)
+      create(:merge_request, source_branch: 'extra2')
+
+      expect(service.execute).to contain_exactly('branch1', 'branch2')
+    end
+  end
+
+  context 'when tags pushed' do
+    let(:pushed_branches) do
+      %w(v10.0.0 v11.0.2 v12.1.0).map do |branch|
+        { ref: "refs/tags/#{branch}" }
+      end
+    end
+
+    it 'returns empty result without any SQL query performed' do
+      control_count = ActiveRecord::QueryRecorder.new do
+        expect(service.execute).to be_empty
+      end.count
+
+      expect(control_count).to be_zero
+    end
+  end
+end