diff --git a/activerecord/test/cases/adapters/postgresql/enum_test.rb b/activerecord/test/cases/adapters/postgresql/enum_test.rb
index d99c4a292e495a8e1d83412b8d6692542b097c7d..83cedc5a7b395157abd50bfc66c66f498fa11b22 100644
--- a/activerecord/test/cases/adapters/postgresql/enum_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/enum_test.rb
@@ -1,8 +1,6 @@
 # -*- coding: utf-8 -*-
 require "cases/helper"
 require 'support/connection_helper'
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 class PostgresqlEnumTest < ActiveRecord::TestCase
   include ConnectionHelper
diff --git a/activerecord/test/cases/adapters/postgresql/hstore_test.rb b/activerecord/test/cases/adapters/postgresql/hstore_test.rb
index 1296eb72c0e1a486e0960b4b0477c8d79ba78023..f14ffe5ddc513dcb7ac2607faa7897723db721fa 100644
--- a/activerecord/test/cases/adapters/postgresql/hstore_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/hstore_test.rb
@@ -1,8 +1,5 @@
 # encoding: utf-8
-
 require "cases/helper"
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 class PostgresqlHstoreTest < ActiveRecord::TestCase
   class Hstore < ActiveRecord::Base
diff --git a/activerecord/test/cases/adapters/postgresql/json_test.rb b/activerecord/test/cases/adapters/postgresql/json_test.rb
index 7a9fdd45e8214df90e7686c9aaec674fa07a9963..340ca29c0e89553a4fa84be81ac968002cee688a 100644
--- a/activerecord/test/cases/adapters/postgresql/json_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/json_test.rb
@@ -1,8 +1,5 @@
 # encoding: utf-8
-
 require "cases/helper"
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 require 'support/schema_dumping_helper'
 
 module PostgresqlJSONSharedTestCases
diff --git a/activerecord/test/cases/adapters/postgresql/uuid_test.rb b/activerecord/test/cases/adapters/postgresql/uuid_test.rb
index c3705e7dacfa62c8a495ba8689078c52ae0922ca..5753da1173d22b9a6529b5608a14901800bb9830 100644
--- a/activerecord/test/cases/adapters/postgresql/uuid_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/uuid_test.rb
@@ -1,8 +1,5 @@
 # encoding: utf-8
-
 require "cases/helper"
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 require 'support/schema_dumping_helper'
 
 module PostgresqlUUIDHelper