Remove hardcoded value

app/models/epp_session.rb

@@ -6,11 +6,10 @@ class EppSession < ApplicationRecord
   class_attribute :timeout
   self.timeout = (ENV['epp_session_timeout_seconds'] || 300).to_i.seconds
 
-  alias_attribute :last_access, :updated_at
+  class_attribute :limit_per_registrar
+  self.limit_per_registrar = (ENV['epp_session_limit_per_registrar'] || 4).to_i
 
-  def self.limit_per_registrar
-    4
-  end
+  alias_attribute :last_access, :updated_at
 
   def self.limit_reached?(registrar)
     count = where(user_id: registrar.api_users.ids).where('updated_at >= ?', Time.zone.now - 1.second).count

config/application.yml.sample

@@ -170,6 +170,8 @@ tara_rant_redirect_uri: 'redirect_uri'
 default_email_validation_type: 'regex'
 
 
+epp_session_limit_per_registrar: '4'
+
 # Since the keys for staging are absent from the repo, we need to supply them separate for testing.
 test:
   payments_seb_bank_certificate: 'test/fixtures/files/seb_bank_cert.pem'

test/models/epp_session_test.rb

@@ -49,10 +49,6 @@ class EppSessionTest < ActiveSupport::TestCase
     end
   end
 
-  def test_limit_per_registrar
-    assert_equal 4, EppSession.limit_per_registrar
-  end
-
   def test_limit_is_per_registrar
     travel_to Time.zone.parse('2010-07-05')
     EppSession.delete_all