rename simple adapter to json

test/adapter/json_adapter_test.rb

@@ -3,12 +3,12 @@ require 'test_helper'
 module ActiveModel
   class Serializer
     class Adapter
-      class SimpleAdapterTest < Minitest::Test
+      class JsonAdapterTest < Minitest::Test
         def setup
           @profile = Profile.new({ name: 'Name 1', description: 'Description 1', comments: 'Comments 1' })
           @profile_serializer = ProfileSerializer.new(@profile)
 
-          @adapter = SimpleAdapter.new(@profile_serializer)
+          @adapter = JsonAdapter.new(@profile_serializer)
         end
 
         def test_serializable_hash

test/serializers/adapter_for_test.rb

@@ -11,7 +11,7 @@ module ActiveModel
 
       def test_returns_default_adapter
         adapter = ActiveModel::Serializer.adapter
-        assert_equal ActiveModel::Serializer::Adapter::SimpleAdapter, adapter
+        assert_equal ActiveModel::Serializer::Adapter::JsonAdapter, adapter
       end
 
       def test_overwrite_adapter_with_symbol

test/serializers/configuration_test.rb

@@ -8,7 +8,7 @@ module ActiveModel
       end
 
       def test_adapter
-        assert_equal :simple, ActiveModel::Serializer.config.adapter
+        assert_equal :json, ActiveModel::Serializer.config.adapter
       end
     end
   end