diff --git a/activerecord/test/cases/adapters/postgresql/array_test.rb b/activerecord/test/cases/adapters/postgresql/array_test.rb
index b9e0f62db88a2..7488f02426109 100644
--- a/activerecord/test/cases/adapters/postgresql/array_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/array_test.rb
@@ -1,7 +1,5 @@
 # encoding: utf-8
 require "cases/helper"
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 class PostgresqlArrayTest < ActiveRecord::TestCase
   class PgArray < ActiveRecord::Base
diff --git a/activerecord/test/cases/adapters/postgresql/bytea_test.rb b/activerecord/test/cases/adapters/postgresql/bytea_test.rb
index fadadfa57cd55..3f8a5d10621ec 100644
--- a/activerecord/test/cases/adapters/postgresql/bytea_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/bytea_test.rb
@@ -1,8 +1,5 @@
 # encoding: utf-8
-
 require "cases/helper"
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 class PostgresqlByteaTest < ActiveRecord::TestCase
   class ByteaDataType < ActiveRecord::Base
diff --git a/activerecord/test/cases/adapters/postgresql/citext_test.rb b/activerecord/test/cases/adapters/postgresql/citext_test.rb
index 849305072693c..90e837d426496 100644
--- a/activerecord/test/cases/adapters/postgresql/citext_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/citext_test.rb
@@ -1,8 +1,5 @@
 # encoding: utf-8
-
 require 'cases/helper'
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 if ActiveRecord::Base.connection.supports_extensions?
   class PostgresqlCitextTest < ActiveRecord::TestCase
diff --git a/activerecord/test/cases/adapters/postgresql/composite_test.rb b/activerecord/test/cases/adapters/postgresql/composite_test.rb
index d804d1fa97374..a925263098d9a 100644
--- a/activerecord/test/cases/adapters/postgresql/composite_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/composite_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'
 
 module PostgresqlCompositeBehavior
   include ConnectionHelper
diff --git a/activerecord/test/cases/adapters/postgresql/domain_test.rb b/activerecord/test/cases/adapters/postgresql/domain_test.rb
index 5286a847a493d..fd7fdecff132e 100644
--- a/activerecord/test/cases/adapters/postgresql/domain_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/domain_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 PostgresqlDomainTest < ActiveRecord::TestCase
   include ConnectionHelper
diff --git a/activerecord/test/cases/adapters/postgresql/extension_migration_test.rb b/activerecord/test/cases/adapters/postgresql/extension_migration_test.rb
index 91058f8681811..7b99fcdda071d 100644
--- a/activerecord/test/cases/adapters/postgresql/extension_migration_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/extension_migration_test.rb
@@ -1,6 +1,4 @@
 require "cases/helper"
-require "active_record/base"
-require "active_record/connection_adapters/postgresql_adapter"
 
 class PostgresqlExtensionMigrationTest < ActiveRecord::TestCase
   self.use_transactional_fixtures = false
diff --git a/activerecord/test/cases/adapters/postgresql/full_text_test.rb b/activerecord/test/cases/adapters/postgresql/full_text_test.rb
index 4442abcbc4025..ec646de5e9398 100644
--- a/activerecord/test/cases/adapters/postgresql/full_text_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/full_text_test.rb
@@ -1,8 +1,5 @@
 # encoding: utf-8
-
 require "cases/helper"
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 class PostgresqlFullTextTest < ActiveRecord::TestCase
   class PostgresqlTsvector < ActiveRecord::Base; end
diff --git a/activerecord/test/cases/adapters/postgresql/ltree_test.rb b/activerecord/test/cases/adapters/postgresql/ltree_test.rb
index 718f37a380510..ddb7cd658c26b 100644
--- a/activerecord/test/cases/adapters/postgresql/ltree_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/ltree_test.rb
@@ -1,7 +1,5 @@
 # encoding: utf-8
 require "cases/helper"
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 class PostgresqlLtreeTest < ActiveRecord::TestCase
   class Ltree < ActiveRecord::Base
diff --git a/activerecord/test/cases/adapters/postgresql/network_test.rb b/activerecord/test/cases/adapters/postgresql/network_test.rb
index e99af07970937..32085cbb17d2e 100644
--- a/activerecord/test/cases/adapters/postgresql/network_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/network_test.rb
@@ -1,8 +1,5 @@
 # encoding: utf-8
-
 require "cases/helper"
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 class PostgresqlNetworkTest < ActiveRecord::TestCase
   class PostgresqlNetworkAddress < ActiveRecord::Base
diff --git a/activerecord/test/cases/adapters/postgresql/range_test.rb b/activerecord/test/cases/adapters/postgresql/range_test.rb
index 060b17d0716d6..4d9cfe55f512b 100644
--- a/activerecord/test/cases/adapters/postgresql/range_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/range_test.rb
@@ -1,7 +1,5 @@
 require "cases/helper"
 require 'support/connection_helper'
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 if ActiveRecord::Base.connection.supports_ranges?
   class PostgresqlRange < ActiveRecord::Base
diff --git a/activerecord/test/cases/adapters/postgresql/xml_test.rb b/activerecord/test/cases/adapters/postgresql/xml_test.rb
index c1c85f8c925c0..48c6eeb62c6bf 100644
--- a/activerecord/test/cases/adapters/postgresql/xml_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/xml_test.rb
@@ -1,8 +1,5 @@
 # encoding: utf-8
-
 require 'cases/helper'
-require 'active_record/base'
-require 'active_record/connection_adapters/postgresql_adapter'
 
 class PostgresqlXMLTest < ActiveRecord::TestCase
   class XmlDataType < ActiveRecord::Base