diff --git a/Gemfile b/Gemfile
index 13763e699..1d23d00d8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -93,6 +93,7 @@ group :test do
   gem 'shoulda-matchers', require: false
   gem 'timecop'
   gem 'vcr'
+  gem 'webdrivers', '~> 4.0'
   gem 'webmock'
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 7eaa820eb..fae5871bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -162,7 +162,7 @@ GEM
       carrierwave (>= 0.9)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
-    crass (1.0.4)
+    crass (1.0.5)
     css_parser (1.6.0)
       addressable
     curb (0.9.10)
@@ -356,7 +356,7 @@ GEM
       railties (>= 4)
       request_store (~> 1.0)
     logstash-event (1.2.02)
-    loofah (2.2.3)
+    loofah (2.3.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.13)
@@ -385,7 +385,7 @@ GEM
     nenv (0.3.0)
     netrc (0.11.0)
     nio4r (2.3.1)
-    nokogiri (1.10.4)
+    nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
@@ -678,6 +678,10 @@ GEM
       activemodel (>= 5.0)
       bindex (>= 0.4.0)
       railties (>= 5.0)
+    webdrivers (4.1.3)
+      nokogiri (~> 1.6)
+      rubyzip (>= 1.3.0)
+      selenium-webdriver (>= 3.0, < 4.0)
     webfinger (1.1.0)
       activesupport
       httpclient (>= 2.4)
@@ -812,6 +816,7 @@ DEPENDENCIES
   vcr
   warden
   web-console
+  webdrivers (~> 4.0)
   webmock
   webpacker
   xray-rails
diff --git a/README.md b/README.md
index 97683c010..faf159341 100644
--- a/README.md
+++ b/README.md
@@ -43,8 +43,14 @@ Les informations nécessaire à l'initialisation de la base doivent être pré-c
     > create user tps_test with password 'tps_test' superuser;
     > \q
 
+
 ### Initialisation de l'environnement de développement
 
+Sous Ubuntu, certains packages doivent être installés au préalable :
+
+    sudo apt-get install libcurl3 libcurl3-gnutls libcurl4-openssl-dev libcurl4-gnutls-dev zlib1g-dev
+
+
 Afin d'initialiser l'environnement de développement, exécutez la commande suivante :
 
     bin/setup
diff --git a/app/controllers/admin/assigns_controller.rb b/app/controllers/admin/assigns_controller.rb
index 5a59330c4..cf2899643 100644
--- a/app/controllers/admin/assigns_controller.rb
+++ b/app/controllers/admin/assigns_controller.rb
@@ -17,8 +17,9 @@ class Admin::AssignsController < AdminController
 
     not_assign_scope = current_administrateur.instructeurs.where.not(id: assign_scope.ids)
 
-    if params[:filter]
-      not_assign_scope = not_assign_scope.where("email LIKE ?", "%#{params[:filter]}%")
+    if params[:filter].present?
+      filter = params[:filter].downcase.strip
+      not_assign_scope = not_assign_scope.where('users.email LIKE ?', "%#{filter}%")
     end
 
     @instructeurs_not_assign = smart_listing_create :instructeurs_not_assign,
diff --git a/app/lib/api_carto/api.rb b/app/lib/api_carto/api.rb
index f94c11e2d..eadb813f8 100644
--- a/app/lib/api_carto/api.rb
+++ b/app/lib/api_carto/api.rb
@@ -12,11 +12,14 @@ class ApiCarto::API
   private
 
   def self.call(url, geojson)
-    params = geojson.to_s
-    RestClient.post(url, params, content_type: 'application/json')
+    response = Typhoeus.post(url, body: geojson.to_s, headers: { 'content-type' => 'application/json' })
 
-  rescue RestClient::InternalServerError, RestClient::BadGateway, RestClient::GatewayTimeout, RestClient::ServiceUnavailable => e
-    Rails.logger.error "[ApiCarto] Error on #{url}: #{e}"
-    raise RestClient::ResourceNotFound
+    if response.success?
+      response.body
+    else
+      message = response.code == 0 ? response.return_message : response.code.to_s
+      Rails.logger.error "[ApiCarto] Error on #{url}: #{message}"
+      raise RestClient::ResourceNotFound
+    end
   end
 end
diff --git a/bin/setup b/bin/setup
index 3d592bcd5..34110e498 100755
--- a/bin/setup
+++ b/bin/setup
@@ -18,6 +18,8 @@ chdir APP_ROOT do
   system('bundle check') || system!('bundle install')
   system! 'bin/yarn install'
 
+  puts "\n== Updating webdrivers =="
+  system! 'RAILS_ENV=test bin/rails webdrivers:chromedriver:update'
 
   puts "\n== Copying sample files =="
   unless File.exist?('.env')
diff --git a/bin/update b/bin/update
index c1968201d..04eb642c5 100755
--- a/bin/update
+++ b/bin/update
@@ -18,6 +18,9 @@ chdir APP_ROOT do
   system('bundle check') || system!('bundle install')
   system! 'bin/yarn install'
 
+  puts "\n== Updating webdrivers =="
+  system! 'RAILS_ENV=test bin/rails webdrivers:chromedriver:update'
+
   puts "\n== Updating database =="
   system! 'bin/rails db:migrate'
 
diff --git a/spec/controllers/admin/assigns_controller_spec.rb b/spec/controllers/admin/assigns_controller_spec.rb
index 95fb4474a..741937dd8 100644
--- a/spec/controllers/admin/assigns_controller_spec.rb
+++ b/spec/controllers/admin/assigns_controller_spec.rb
@@ -2,19 +2,53 @@ require 'spec_helper'
 
 describe Admin::AssignsController, type: :controller do
   let(:admin) { create(:administrateur) }
-  let(:procedure) { create :procedure, administrateur: admin }
-  let(:instructeur) { create :instructeur, administrateurs: [admin] }
 
   before do
     sign_in(admin.user)
   end
 
   describe 'GET #show' do
-    subject { get :show, params: { procedure_id: procedure.id } }
-    it { expect(subject.status).to eq(200) }
+    let(:procedure) { create :procedure, administrateur: admin, instructeurs: [instructeur_assigned_1, instructeur_assigned_2] }
+    let!(:instructeur_assigned_1) { create :instructeur, email: 'instructeur_1@ministere_a.gouv.fr', administrateurs: [admin] }
+    let!(:instructeur_assigned_2) { create :instructeur, email: 'instructeur_2@ministere_b.gouv.fr', administrateurs: [admin] }
+    let!(:instructeur_not_assigned_1) { create :instructeur, email: 'instructeur_3@ministere_a.gouv.fr', administrateurs: [admin] }
+    let!(:instructeur_not_assigned_2) { create :instructeur, email: 'instructeur_4@ministere_b.gouv.fr', administrateurs: [admin] }
+    let(:filter) { nil }
+
+    subject! { get :show, params: { procedure_id: procedure.id, filter: filter } }
+
+    it { expect(response.status).to eq(200) }
+
+    it 'sets the assigned and not assigned instructeurs' do
+      expect(assigns(:instructeurs_assign)).to match_array([instructeur_assigned_1, instructeur_assigned_2])
+      expect(assigns(:instructeurs_not_assign)).to match_array([instructeur_not_assigned_1, instructeur_not_assigned_2])
+    end
+
+    context 'with a search filter' do
+      let(:filter) { '@ministere_a.gouv.fr' }
+
+      it 'filters the unassigned instructeurs' do
+        expect(assigns(:instructeurs_not_assign)).to match_array([instructeur_not_assigned_1])
+      end
+
+      it 'does not filter the assigned instructeurs' do
+        expect(assigns(:instructeurs_assign)).to match_array([instructeur_assigned_1, instructeur_assigned_2])
+      end
+
+      context 'when the filter has spaces or a mixed case' do
+        let(:filter) { ' @ministere_A.gouv.fr  ' }
+
+        it 'trims spaces and ignores the case' do
+          expect(assigns(:instructeurs_not_assign)).to match_array([instructeur_not_assigned_1])
+        end
+      end
+    end
   end
 
   describe 'PUT #update' do
+    let(:procedure) { create :procedure, administrateur: admin }
+    let(:instructeur) { create :instructeur, administrateurs: [admin] }
+
     subject { put :update, params: { instructeur_id: instructeur.id, procedure_id: procedure.id, to: 'assign' } }
 
     it { expect(subject).to redirect_to admin_procedure_assigns_path(procedure_id: procedure.id) }
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index dd0af845a..655686eb2 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -83,7 +83,7 @@ VCR.configure do |c|
   c.hook_into :webmock
   c.cassette_library_dir = 'spec/fixtures/cassettes'
   c.configure_rspec_metadata!
-  c.ignore_hosts 'test.host'
+  c.ignore_hosts 'test.host', 'chromedriver.storage.googleapis.com'
 end
 
 DatabaseCleaner.strategy = :transaction