tests: add specs for duos

api/spec/factories/exams.rb

@@ -16,5 +16,11 @@
         exam.questions = create_list(:question, evaluator.question_count, :with_options)
       end
     end
+
+    trait :with_duos do
+      after(:create) do |exam, evaluator|
+        exam.questions = create_list(:question, evaluator.question_count, :duos)
+      end
+    end
   end
 end

api/spec/factories/questions.rb

@@ -14,5 +14,13 @@
         question.options.first.update(correct: true)
       end
     end
+
+    trait :duos do
+      after(:build) do |question, evaluator|
+        question.has_duo = true
+        question.options = build_list(:option, evaluator.options_count, question:)
+        question.options.first.update(correct: true)
+      end
+    end
   end
 end

api/spec/requests/exams_spec.rb

@@ -79,4 +79,39 @@
       end
     end
   end
+
+  describe 'GET /exams/:id/duos' do
+    let!(:exam) { create(:exam, :with_duos, id: 1) }
+
+    describe 'when question.has_duo' do
+      it 'return duos list randomly' do
+        get '/api/exams/1/duos'
+
+        expect(response).to have_http_status(:success)
+
+        expect(json_body).to include('title')
+        expect(json_body['duos'][0].length).not_to eq(0)
+        expect(json_body['duos'][1].length).not_to eq(0)
+      end
+    end
+  end
+
+  describe 'POST /exams/:id/duos/evaluate' do
+    let!(:exam) { create(:exam, :with_duos, id: 1) }
+
+    describe 'when does not match duos' do
+      let(:params) do
+        {
+          duos: exam.questions.map { |q| [q.id, q.options[0].id] }
+        }
+      end
+
+      it 'return failure message' do
+        post('/api/exams/1/duos/evaluate', params:)
+
+        expect(response).to have_http_status(:success)
+        expect(json_body['message']).to eq('Oops, try again!')
+      end
+    end
+  end
 end