1 files changed, 92 insertions, 0 deletions
diff --git a/spec/services/issuable/import_csv/base_service_spec.rb b/spec/services/issuable/import_csv/base_service_spec.rb
new file mode 100644
index 00000000000..b07c4556694
--- /dev/null
+++ b/spec/services/issuable/import_csv/base_service_spec.rb
@@ -0,0 +1,92 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Issuable::ImportCsv::BaseService, feature_category: :importers do
+  let_it_be(:user) { create(:user) }
+  let_it_be(:group) { create(:group) }
+  let_it_be(:project) { create(:project, group: group) }
+  let_it_be(:csv_io) { double }
+
+  let(:importer_klass) do
+    Class.new(described_class) do
+      def email_results_to_user
+        # no-op
+      end
+    end
+  end
+
+  let(:service) do
+    uploader = FileUploader.new(project)
+    uploader.store!(file)
+
+    importer_klass.new(user, project, uploader)
+  end
+
+  subject { service.execute }
+
+  describe '#preprocess_milestones' do
+    let(:utility_class) { ImportCsv::PreprocessMilestonesService }
+    let(:file) { fixture_file_upload('spec/fixtures/csv_missing_milestones.csv') }
+    let(:mocked_object) { double }
+
+    before do
+      allow(service).to receive(:create_object).and_return(mocked_object)
+      allow(mocked_object).to receive(:persisted?).and_return(true)
+    end
+
+    context 'with csv that has milestone heading' do
+      before do
+        allow(utility_class).to receive(:new).and_return(utility_class)
+        allow(utility_class).to receive(:execute).and_return(ServiceResponse.success)
+      end
+
+      it 'calls PreprocessMilestonesService' do
+        subject
+        expect(utility_class).to have_received(:new)
+      end
+
+      it 'calls PreprocessMilestonesService with unique milestone titles' do
+        subject
+        expect(utility_class).to have_received(:new).with(user, project, %w[15.10 10.1])
+        expect(utility_class).to have_received(:execute)
+      end
+    end
+
+    context 'with csv that does not have milestone heading' do
+      let(:file) { fixture_file_upload('spec/fixtures/work_items_valid_types.csv') }
+
+      before do
+        allow(utility_class).to receive(:new).and_return(utility_class)
+      end
+
+      it 'does not call PreprocessMilestonesService' do
+        subject
+        expect(utility_class).not_to have_received(:new)
+      end
+    end
+
+    context 'when one or more milestones do not exist' do
+      it 'returns the expected error in results payload' do
+        results = subject
+
+        expect(results[:success]).to eq(0)
+        expect(results[:preprocess_errors]).to match({
+          milestone_errors: { missing: { header: 'Milestone', titles: %w[15.10 10.1] } }
+        })
+      end
+    end
+
+    context 'when all milestones exist' do
+      let!(:group_milestone) { create(:milestone, group: group, title: '10.1') }
+      let!(:project_milestone) { create(:milestone, project: project, title: '15.10') }
+
+      it 'returns a successful response' do
+        results = subject
+
+        expect(results[:preprocess_errors]).to be_empty
+        expect(results[:success]).to eq(4)
+      end
+    end
+  end
+end