models: require belong_to associations on trusted_device_token

app/models/trusted_device_token.rb

@@ -12,7 +12,7 @@ class TrustedDeviceToken < ApplicationRecord
   LOGIN_TOKEN_VALIDITY = 1.week
   LOGIN_TOKEN_YOUTH = 15.minutes
 
-  belongs_to :instructeur
+  belongs_to :instructeur, optional: false
   has_secure_token
 
   def token_valid?

spec/factories/trusted_device_token.rb

@@ -0,0 +1,5 @@
+FactoryBot.define do
+  factory :trusted_device_token do
+    association :instructeur
+  end
+end

spec/models/trusted_device_token_spec.rb

@@ -1,6 +1,6 @@
 RSpec.describe TrustedDeviceToken, type: :model do
   describe '#token_valid?' do
-    let(:token) { TrustedDeviceToken.create }
+    let(:token) { create(:trusted_device_token) }
 
     context 'when the token is create after login_token_validity' do
       it { expect(token.token_valid?).to be true }
@@ -14,7 +14,7 @@ RSpec.describe TrustedDeviceToken, type: :model do
   end
 
   describe '#token_young?' do
-    let(:token) { TrustedDeviceToken.create }
+    let(:token) { create(:trusted_device_token) }
 
     context 'when the token is create after login_token_youth' do
       it { expect(token.token_young?).to be true }