Add dossier_legacy_state helper

app/helpers/dossier_helper.rb

@@ -31,4 +31,21 @@ module DossierHelper
     state = I18n.t(dossier.state, scope: [:activerecord, :attributes, :dossier, :state])
     lower ? state.downcase : state
   end
+
+  def dossier_legacy_state(dossier)
+    case dossier.state
+    when Dossier.states.fetch(:en_construction)
+      'initiated'
+    when Dossier.states.fetch(:en_instruction)
+      'received'
+    when Dossier.states.fetch(:accepte)
+      'closed'
+    when Dossier.states.fetch(:refuse)
+      'refused'
+    when Dossier.states.fetch(:sans_suite)
+      'without_continuation'
+    else
+      dossier.state
+    end
+  end
 end

spec/helpers/dossier_helper_spec.rb

@@ -166,4 +166,38 @@ RSpec.describe DossierHelper, type: :helper do
       end
     end
   end
+
+  describe '.dossier_legacy_state' do
+    subject { dossier_legacy_state(dossier) }
+
+    context 'when the dossier is en instruction' do
+      let(:dossier) { create(:dossier) }
+
+      it { is_expected.to eq('brouillon') }
+    end
+
+    context 'when the dossier is en instruction' do
+      let(:dossier) { create(:dossier, :en_instruction) }
+
+      it { is_expected.to eq('received') }
+    end
+
+    context 'when the dossier is accepte' do
+      let(:dossier) { create(:dossier, state: Dossier.states.fetch(:accepte)) }
+
+      it { is_expected.to eq('closed') }
+    end
+
+    context 'when the dossier is refuse' do
+      let(:dossier) { create(:dossier, state: Dossier.states.fetch(:refuse)) }
+
+      it { is_expected.to eq('refused') }
+    end
+
+    context 'when the dossier is sans_suite' do
+      let(:dossier) { create(:dossier, state: Dossier.states.fetch(:sans_suite)) }
+
+      it { is_expected.to eq('without_continuation') }
+    end
+  end
 end