Add test for DropDownList model

spec/factories/drop_down_list.rb

@@ -0,0 +1,5 @@
+FactoryGirl.define do
+  factory :drop_down_list do
+    value ''
+  end
+end

spec/models/drop_down_list_spec.rb

@@ -0,0 +1,32 @@
+require 'spec_helper'
+
+describe DropDownList do
+  describe 'database columns' do
+    it { is_expected.to have_db_column(:value) }
+  end
+
+  describe 'associations' do
+    it { is_expected.to belong_to(:type_de_champ) }
+  end
+
+  describe '#options' do
+    let(:value) { "Cohésion sociale
+Dév.Eco / Emploi
+Cadre de vie / Urb.
+Pilotage / Ingénierie
+" }
+    let(:dropdownlist) { create :drop_down_list, value: value }
+
+    it { expect(dropdownlist.options).to eq ["Cohésion sociale", "Dév.Eco / Emploi", "Cadre de vie / Urb.", "Pilotage / Ingénierie"] }
+
+    context 'when one value is empty' do
+      let(:value) { "Cohésion sociale
+
+Cadre de vie / Urb.
+Pilotage / Ingénierie
+"  }
+
+      it { expect(dropdownlist.options).to eq ["Cohésion sociale", "Cadre de vie / Urb.", "Pilotage / Ingénierie"] }
+    end
+  end
+end