diff --git a/lib/active_model/serializer/adapter/json_api/links.rb b/lib/active_model/serializer/adapter/json_api/links.rb
deleted file mode 100644
index 4e4c6127..00000000
--- a/lib/active_model/serializer/adapter/json_api/links.rb
+++ /dev/null
@@ -1,25 +0,0 @@
-module ActiveModel
-  class Serializer
-    class Adapter
-      class JsonApi < Adapter
-        class Links
-          def initialize(links = {})
-            @links = links
-          end
-
-          def serializable_hash
-            @links
-          end
-
-          def update(links = {})
-            @links.update(links)
-          end
-
-          def present?
-            !@links.empty?
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/test/action_controller/serialization_test.rb b/test/action_controller/serialization_test.rb
index c6489b29..7e6ea6cc 100644
--- a/test/action_controller/serialization_test.rb
+++ b/test/action_controller/serialization_test.rb
@@ -47,12 +47,11 @@ module ActionController
 
         def render_array_using_implicit_serializer_and_links
           with_adapter ActiveModel::Serializer::Adapter::JsonApi do
-
             @profiles = [
-              Profile.new({ name: 'Name 1', description: 'Description 1', comments: 'Comments 1' })
+              Profile.new(name: 'Name 1', description: 'Description 1', comments: 'Comments 1')
             ]
 
-            render json: @profiles, links: { self: "http://example.com/api/profiles/1" }
+            render json: @profiles, links: { self: 'http://example.com/api/profiles/1' }
           end
         end
 
@@ -272,15 +271,15 @@ module ActionController
           data: [
             {
               id: assigns(:profiles).first.id.to_s,
-              type: "profiles",
+              type: 'profiles',
               attributes: {
-                name: "Name 1",
-                description: "Description 1"
+                name: 'Name 1',
+                description: 'Description 1'
               }
             }
           ],
           links: {
-            self: "http://example.com/api/profiles/1"
+            self: 'http://example.com/api/profiles/1'
           }
         }
 
diff --git a/test/adapter/json_api/links_test.rb b/test/adapter/json_api/links_test.rb
index dbda88ea..5e65f3d5 100644
--- a/test/adapter/json_api/links_test.rb
+++ b/test/adapter/json_api/links_test.rb
@@ -47,6 +47,15 @@ module ActiveModel
             assert_equal(expected, hash[:links])
           end
 
+          def test_nil_toplevel_links
+            hash = ActiveModel::SerializableResource.new(
+              @post,
+              adapter: :json_api,
+              links: nil
+            ).serializable_hash
+            assert_equal(nil, hash[:links])
+          end
+
           def test_resource_links
             hash = serializable(@author, adapter: :json_api).serializable_hash
             expected = {
diff --git a/test/adapter/json_api/top_level_links_test.rb b/test/adapter/json_api/top_level_links_test.rb
deleted file mode 100644
index 3b849d5b..00000000
--- a/test/adapter/json_api/top_level_links_test.rb
+++ /dev/null
@@ -1,101 +0,0 @@
-require 'test_helper'
-
-module ActiveModel
-  class Serializer
-    class Adapter
-      class JsonApi
-        class TopLevelLinksTest < Minitest::Test
-          URI = 'http://example.com'
-
-          def setup
-            ActionController::Base.cache_store.clear
-            @blog = Blog.new(id: 1,
-                             name: 'AMS Hints',
-                             writer: Author.new(id: 2, name: "Steve"),
-                             articles: [Post.new(id: 3, title: "AMS")])
-          end
-
-          def load_adapter(paginated_collection, options = {})
-            options = options.merge(adapter: :json_api)
-            ActiveModel::SerializableResource.new(paginated_collection, options)
-          end
-
-          def test_links_is_not_present_when_not_defined
-            adapter = load_adapter(@blog)
-
-            expected = {
-              :data => {
-                :id => "1",
-                :type => "blogs",
-                :attributes => {
-                  :name => "AMS Hints"
-                },
-                :relationships => {
-                  :writer=> {:data => {:type => "authors", :id => "2"}},
-                  :articles => {:data => [{:type => "posts", :id => "3"}]}
-               }
-            }}
-
-            assert_equal expected, adapter.serializable_hash(@options)
-          end
-
-          def test_links_is_present_when_defined
-            adapter = load_adapter(@blog, {links: links})
-
-            expected = {
-              :data => {
-                :id => "1",
-                :type => "blogs",
-                :attributes => {
-                  :name => "AMS Hints"
-                },
-                :relationships => {
-                  :writer=> {:data => {:type => "authors", :id => "2"}},
-                  :articles => {:data => [{:type => "posts", :id => "3"}]}
-               }
-              },
-               :links => {:self => "http://example.com/blogs/1"}
-            }
-
-            assert_equal expected, adapter.serializable_hash(@options)
-          end
-
-          def links
-            {
-              self: "#{URI}/blogs/1"
-            }
-          end
-
-          # def test_links_is_not_present_when_not_declared
-          #   serializer = AlternateBlogSerializer.new(@blog)
-          #   adapter = ActiveModel::Serializer::Adapter::JsonApi.new(serializer)
-          #   expected = {
-          #     data: {
-          #       id: "1",
-          #       type: "blogs",
-          #       attributes: {
-          #         title: "AMS Hints"
-          #       }
-          #     }
-          #   }
-          #   assert_equal expected, adapter.as_json
-          # end
-
-          # def test_links_is_not_present_on_flattenjson_adapter
-          #   serializer = AlternateBlogSerializer.new(@blog, :links => {:self => "/blogs/1"})
-          #   adapter = ActiveModel::Serializer::Adapter::FlattenJson.new(serializer)
-          #   expected = {:id=>1, :title=>"AMS Hints"}
-          #   assert_equal expected, adapter.as_json
-          # end
-
-          # def test_links_is_not_present_on_json_adapter
-          #   serializer = AlternateBlogSerializer.new(@blog, :links => {:self => "/blogs/1"})
-          #   adapter = ActiveModel::Serializer::Adapter::Json.new(serializer)
-          #   expected = {:blog=>{:id=>1, :title=>"AMS Hints"}}
-          #   assert_equal expected, adapter.as_json
-          # end
-        end
-      end
-    end
-  end
-end