disable france connect authentication for admin and instructeurs

spec/models/france_connect_information_spec.rb

@@ -6,4 +6,27 @@ describe FranceConnectInformation, type: :model do
       it { is_expected.to allow_value('mon super projet').for(:france_connect_particulier_id) }
     end
   end
+
+  describe 'associate_user!' do
+    context 'when there is no user with same email' do
+      let(:fci) { create(:france_connect_information) }
+      let(:subject) { fci.associate_user! }
+
+      it { expect { subject }.to change(User, :count).by(1) }
+      it do
+        subject
+        expect(fci.user.email).to eq(fci.email_france_connect)
+      end
+    end
+
+    context 'when a user with same email (but who is not an instructeur) exist' do
+      let(:user) { create(:user) }
+      let(:fci) { build(:france_connect_information, email_france_connect: user.email) }
+      let(:subject) { fci.associate_user! }
+
+      before { subject }
+
+      it { expect(fci.user).to eq(user) }
+    end
+  end
 end