Make admin serialiser specs runnable on their own

app/serializers/api/admin/subscription_customer_serializer.rb

@@ -1,3 +1,5 @@
+require 'spec_helper'
+
 module Api
   module Admin
     # Used by admin subscription form

spec/serializers/admin/customer_serializer_spec.rb

@@ -1,3 +1,5 @@
+require 'spec_helper'
+
 describe Api::Admin::CustomerSerializer do
   let(:customer) { create(:customer, tag_list: "one, two, three") }
   let!(:tag_rule) { create(:tag_rule, enterprise: customer.enterprise, preferred_customer_tags: "two") }

spec/serializers/admin/enterprise_serializer_spec.rb

@@ -1,3 +1,5 @@
+require 'spec_helper'
+
 describe Api::Admin::EnterpriseSerializer do
   let(:enterprise) { create(:distributor_enterprise) }
   it "serializes an enterprise" do

spec/serializers/admin/exchange_serializer_spec.rb

@@ -1,3 +1,4 @@
+require 'spec_helper'
 require 'open_food_network/order_cycle_permissions'
 
 describe Api::Admin::ExchangeSerializer do

spec/serializers/admin/index_enterprise_serializer_spec.rb

@@ -1,3 +1,5 @@
+require 'spec_helper'
+
 describe Api::Admin::IndexEnterpriseSerializer do
   include AuthenticationWorkflow
 

spec/serializers/admin/subscription_customer_serializer_spec.rb

@@ -1,3 +1,5 @@
+require 'spec_helper'
+
 describe Api::Admin::SubscriptionCustomerSerializer do
   let(:address) { build(:address) }
   let(:customer) { build(:customer) }