Serializer should be available wiithing adapter to inspect attributes and assotions

test/adapter_test.rb

@@ -5,8 +5,8 @@ module ActiveModel
     class AdapterTest < Minitest::Test
       def setup
         profile = Profile.new
-        serializer = ProfileSerializer.new(profile)
-        @adapter = ActiveModel::Serializer::Adapter.new(serializer)
+        @serializer = ProfileSerializer.new(profile)
+        @adapter = ActiveModel::Serializer::Adapter.new(@serializer)
       end
 
       def test_serializable_hash_is_abstract_method
@@ -20,6 +20,10 @@ module ActiveModel
           @adapter.to_json(only: [:name])
         end
       end
+
+      def test_serializer
+        assert_equal @serializer, @adapter.serializer
+      end
     end
 
     class AdapterForTest < Minitest::Test