Add missing requires

lib/active_model/array_serializer.rb

@@ -1,3 +1,5 @@
+require 'active_model/serializer'
+
 module ActiveModel
   class ArraySerializer
     class << self

lib/active_model/serializer.rb

@@ -1,3 +1,4 @@
+require 'active_model/array_serializer'
 require 'active_model/serializer/associations'
 
 module ActiveModel

lib/active_model/serializer/associations.rb

@@ -1,3 +1,5 @@
+require 'active_model/serializer'
+
 module ActiveModel
   class Serializer
     class Association

lib/active_model_serializers.rb

@@ -1,6 +1,6 @@
 require 'active_model'
 require 'active_model/serializer'
-require 'active_model/array_serializer'
+require 'active_model/serializer/version'
 
 begin
   require 'action_controller'

test/integration/action_controller/serialization_test.rb

@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model_serializers'
 
 module ActionController
   module Serialization

test/integration/active_record/active_record_test.rb

@@ -1,6 +1,5 @@
 require 'test_helper'
 require 'fixtures/active_record'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer

test/test_helper.rb

@@ -1,6 +1,6 @@
 require 'bundler/setup'
-require 'active_model_serializers'
 require 'test/unit'
+require 'active_model_serializers'
 require 'fixtures/poro'
 
 module TestHelper

test/unit/active_model/array_serializer/root_test.rb

@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class ArraySerializer

test/unit/active_model/array_serializer/serialize_test.rb

@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class ArraySerializer

test/unit/active_model/serializer/attributes_test.rb

@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer

test/unit/active_model/serializer/has_many_test.rb

@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer

test/unit/active_model/serializer/has_one_test.rb

@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer

test/unit/active_model/serializer/meta_test.rb

@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer

test/unit/active_model/serializer/root_test.rb

@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer

test/unit/active_model/serializer/scope_test.rb

@@ -1,5 +1,4 @@
 require 'test_helper'
-require 'active_model/serializer'
 
 module ActiveModel
   class Serializer