protect page with check the owner's dossier

spec/support/shared_exemples_for_dossier.rb

@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+RSpec.shared_examples 'not owner of dossier' do |controller, redirect|
+  let(:dossier_2) { create(:dossier, :with_user) }
+
+  before do
+    get controller, dossier_id: dossier_2.id
+  end
+
+  it 'redirect to home page' do
+    redirect_page = '/'
+    redirect_page = redirect unless redirect.nil?
+
+    expect(response).to redirect_to(redirect_page)
+  end
+
+  it 'show a flash message error' do
+    expect(flash[:alert]).to be_present
+  end
+end