add complexity check to admin account creation

spec/models/user_spec.rb

@@ -295,4 +295,34 @@ describe User, type: :model do
       end
     end
   end
+
+  describe '#password_complexity' do
+    let(:email) { 'mail@beta.gouv.fr' }
+    let(:passwords) { ['pass', '12pass23', 'démarches ', 'démarches-simple', '{My-$3cure-p4ssWord}'] }
+    let(:administrateur) { build(:user, email: email, password: password, administrateur: build(:administrateur)) }
+    let(:min_complexity) { PASSWORD_COMPLEXITY_FOR_ADMIN }
+
+    subject do
+      administrateur.save
+      administrateur.errors.full_messages
+    end
+
+    context 'when password is too short' do
+      let(:password) { 's' * (PASSWORD_MIN_LENGTH - 1) }
+
+      it { expect(subject).to eq(["Le mot de passe est trop court"]) }
+    end
+
+    context 'when password is too simple' do
+      let(:password) { passwords[min_complexity - 1] }
+
+      it { expect(subject).to eq(["Le mot de passe n’est pas assez complexe"]) }
+    end
+
+    context 'when password is acceptable' do
+      let(:password) { passwords[min_complexity] }
+
+      it { expect(subject).to eq([]) }
+    end
+  end
 end