views: fix missing attestation link

- Fix the missing link to see attestations (see #4400)
- Fix the "Repasser en instruction" wording being confusing for
  accepted state
- Add lot of tests

spec/views/instructeur/dossiers/_state_button.html.haml_spec.rb

@@ -0,0 +1,127 @@
+require 'spec_helper'
+
+describe 'instructeurs/dossiers/state_button.html.haml', type: :view do
+  include DossierHelper
+
+  subject! do
+    render('instructeurs/dossiers/state_button.html.haml', dossier: dossier)
+  end
+
+  matcher :have_state_label do |expected_title|
+    match do |rendered|
+      expect(rendered).to have_selector('.label', text: expected_title)
+      expect(rendered).not_to have_selector('.dropdown')
+    end
+  end
+
+  matcher :have_dropdown_title do |expected_title|
+    match do |rendered|
+      expect(rendered).to have_selector('.dropdown .dropdown-button', text: expected_title)
+    end
+  end
+
+  matcher :have_dropdown_items do |options|
+    match do |rendered|
+      expected_count = options[:count] || 1
+      expect(rendered).to have_selector('ul.dropdown-items li', count: expected_count)
+    end
+  end
+
+  matcher :have_dropdown_item do |expected_title, options = {}|
+    match do |rendered|
+      expected_href = options[:href]
+      if (expected_href.present?)
+        expect(rendered).to have_selector("ul.dropdown-items li a[href='#{expected_href}']", text: expected_title)
+      else
+        expect(rendered).to have_selector('ul.dropdown-items li', text: expected_title)
+      end
+    end
+  end
+
+  context 'brouillon' do
+    let(:dossier) { create(:dossier) }
+
+    # Currently the state button is not supposed to be displayed for brouillons.
+    # But better have a sane fallback than crashing.
+
+    it 'renders a label' do
+      expect(rendered).to have_state_label('brouillon')
+    end
+  end
+
+  context 'en_contruction' do
+    let(:dossier) { create(:dossier, :en_construction) }
+
+    it 'renders a dropdown' do
+      expect(rendered).to have_dropdown_title('En construction')
+      expect(rendered).to have_dropdown_items(count: 2)
+      expect(rendered).to have_dropdown_item('En construction')
+      expect(rendered).to have_dropdown_item('Passer en instruction', href: passer_en_instruction_instructeur_dossier_path(dossier.procedure, dossier))
+    end
+  end
+
+  context 'en_instruction' do
+    let(:dossier) { create(:dossier, :en_instruction) }
+
+    it 'renders a dropdown' do
+      expect(rendered).to have_dropdown_title('En instruction')
+      expect(rendered).to have_dropdown_items(count: 5)
+      expect(rendered).to have_dropdown_item('Repasser en construction', href: repasser_en_construction_instructeur_dossier_path(dossier.procedure, dossier))
+      expect(rendered).to have_dropdown_item('En instruction')
+      expect(rendered).to have_dropdown_item('Accepter')
+      expect(rendered).to have_dropdown_item('Classer sans suite')
+      expect(rendered).to have_dropdown_item('Refuser')
+    end
+  end
+
+  shared_examples 'a dropdown for a closed state' do |state|
+    let(:dossier) { create :dossier, state }
+
+    # FIXME: it should also render the link to move back to instruction
+    it 'renders a simple label' do
+      expect(rendered).to have_state_label(dossier_display_state(dossier, lower: true))
+    end
+
+    context 'with a motivation' do
+      let(:dossier) { create :dossier, state, motivation: 'Correspond au programme' }
+
+      it 'renders a dropdown' do
+        expect(rendered).to have_dropdown_title(dossier_display_state(dossier, lower: true))
+        expect(rendered).to have_dropdown_items(count: 1)
+        expect(rendered).to have_dropdown_item('Repasser en instruction', href: repasser_en_instruction_instructeur_dossier_path(dossier.procedure, dossier))
+      end
+
+      it 'displays the motivation text' do
+        expect(rendered).to have_content('Motivation')
+        expect(rendered).to have_content(dossier.motivation)
+      end
+    end
+
+    context 'with an attestation' do
+      let(:dossier) { create :dossier, state, :with_attestation }
+
+      it 'renders a dropdown' do
+        expect(rendered).to have_dropdown_title(dossier_display_state(dossier, lower: true))
+        expect(rendered).to have_dropdown_items(count: 1)
+        expect(rendered).to have_dropdown_item('Repasser en instruction', href: repasser_en_instruction_instructeur_dossier_path(dossier.procedure, dossier))
+      end
+
+      it 'provides a link to the attestation' do
+        expect(rendered).to have_content('Attestation')
+        expect(rendered).to have_link(href: attestation_instructeur_dossier_path(dossier.procedure, dossier))
+      end
+    end
+  end
+
+  context 'accepte' do
+    it_behaves_like 'a dropdown for a closed state', :accepte
+  end
+
+  context 'refuse' do
+    it_behaves_like 'a dropdown for a closed state', :refuse
+  end
+
+  context 'sans_suite' do
+    it_behaves_like 'a dropdown for a closed state', :sans_suite
+  end
+end