diff --git a/activerecord/test/cases/adapters/postgresql/array_test.rb b/activerecord/test/cases/adapters/postgresql/array_test.rb
index 8df1b7d18c..ff553c3f1a 100644
--- a/activerecord/test/cases/adapters/postgresql/array_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/array_test.rb
@@ -12,12 +12,7 @@ class PostgresqlArrayTest < ActiveRecord::TestCase
   def setup
     @connection = ActiveRecord::Base.connection
 
-    unless @connection.extension_enabled?('hstore')
-      @connection.enable_extension 'hstore'
-      @connection.commit_db_transaction
-    end
-
-    @connection.reconnect!
+    enable_extension!('hstore', @connection)
 
     @connection.transaction do
       @connection.create_table('pg_arrays') do |t|
@@ -32,6 +27,7 @@ class PostgresqlArrayTest < ActiveRecord::TestCase
 
   teardown do
     @connection.execute 'drop table if exists pg_arrays'
+    disable_extension!('hstore', @connection)
   end
 
   def test_column
diff --git a/activerecord/test/cases/adapters/postgresql/citext_test.rb b/activerecord/test/cases/adapters/postgresql/citext_test.rb
index 2acb64f81c..cb024463c9 100644
--- a/activerecord/test/cases/adapters/postgresql/citext_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/citext_test.rb
@@ -10,12 +10,7 @@ if ActiveRecord::Base.connection.supports_extensions?
     def setup
       @connection = ActiveRecord::Base.connection
 
-      unless @connection.extension_enabled?('citext')
-        @connection.enable_extension 'citext'
-        @connection.commit_db_transaction
-      end
-
-      @connection.reconnect!
+      enable_extension!('citext', @connection)
 
       @connection.create_table('citexts') do |t|
         t.citext 'cival'
@@ -24,7 +19,7 @@ if ActiveRecord::Base.connection.supports_extensions?
 
     teardown do
       @connection.execute 'DROP TABLE IF EXISTS citexts;'
-      @connection.execute 'DROP EXTENSION IF EXISTS citext CASCADE;'
+      disable_extension!('citext', @connection)
     end
 
     def test_citext_enabled
diff --git a/activerecord/test/cases/adapters/postgresql/ltree_test.rb b/activerecord/test/cases/adapters/postgresql/ltree_test.rb
index 889e369bd6..2968109346 100644
--- a/activerecord/test/cases/adapters/postgresql/ltree_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/ltree_test.rb
@@ -9,9 +9,7 @@ class PostgresqlLtreeTest < ActiveRecord::TestCase
   def setup
     @connection = ActiveRecord::Base.connection
 
-    unless @connection.extension_enabled?('ltree')
-      @connection.enable_extension 'ltree'
-    end
+    enable_extension!('ltree', @connection)
 
     @connection.transaction do
       @connection.create_table('ltrees') do |t|
diff --git a/activerecord/test/cases/adapters/postgresql/uuid_test.rb b/activerecord/test/cases/adapters/postgresql/uuid_test.rb
index 6e7920b814..ae5b409f99 100644
--- a/activerecord/test/cases/adapters/postgresql/uuid_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/uuid_test.rb
@@ -118,7 +118,7 @@ class PostgresqlUUIDGenerationTest < ActiveRecord::TestCase
   end
 
   setup do
-    enable_uuid_ossp!(connection)
+    enable_extension!('uuid-ossp', connection)
 
     connection.create_table('pg_uuids', id: :uuid, default: 'uuid_generate_v1()') do |t|
       t.string 'name'
@@ -144,6 +144,7 @@ class PostgresqlUUIDGenerationTest < ActiveRecord::TestCase
     drop_table "pg_uuids"
     drop_table 'pg_uuids_2'
     connection.execute 'DROP FUNCTION IF EXISTS my_uuid_generator();'
+    disable_extension!('uuid-ossp', connection)
   end
 
   if ActiveRecord::Base.connection.supports_extensions?
@@ -189,7 +190,7 @@ class PostgresqlUUIDTestNilDefault < ActiveRecord::TestCase
   include PostgresqlUUIDHelper
 
   setup do
-    enable_uuid_ossp!(connection)
+    enable_extension!('uuid-ossp', connection)
 
     connection.create_table('pg_uuids', id: false) do |t|
       t.primary_key :id, :uuid, default: nil
@@ -199,6 +200,7 @@ class PostgresqlUUIDTestNilDefault < ActiveRecord::TestCase
 
   teardown do
     drop_table "pg_uuids"
+    disable_extension!('uuid-ossp', connection)
   end
 
   if ActiveRecord::Base.connection.supports_extensions?
@@ -226,7 +228,7 @@ class PostgresqlUUIDTestInverseOf < ActiveRecord::TestCase
   end
 
   setup do
-    enable_uuid_ossp!(connection)
+    enable_extension!('uuid-ossp', connection)
 
     connection.transaction do
       connection.create_table('pg_uuid_posts', id: :uuid) do |t|
@@ -240,10 +242,9 @@ class PostgresqlUUIDTestInverseOf < ActiveRecord::TestCase
   end
 
   teardown do
-    connection.transaction do
       drop_table "pg_uuid_comments"
       drop_table "pg_uuid_posts"
-    end
+      disable_extension!('uuid-ossp', connection)
   end
 
   if ActiveRecord::Base.connection.supports_extensions?
diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index 1a31c2ec4a..3d9328b198 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -119,15 +119,23 @@ def verify_default_timezone_config
   end
 end
 
-def enable_uuid_ossp!(connection)
+def enable_extension!(extension, connection)
   return false unless connection.supports_extensions?
-  return connection.reconnect! if connection.extension_enabled?('uuid-ossp')
+  return connection.reconnect! if connection.extension_enabled?(extension)
 
-  connection.enable_extension 'uuid-ossp'
+  connection.enable_extension extension
   connection.commit_db_transaction
   connection.reconnect!
 end
 
+def disable_extension!(extension, connection)
+  return false unless connection.supports_extensions?
+  return true unless connection.extension_enabled?(extension)
+
+  connection.disable_extension extension
+  connection.reconnect!
+end
+
 unless ENV['FIXTURE_DEBUG']
   module ActiveRecord::TestFixtures::ClassMethods
     def try_to_load_dependency_with_silence(*args)
diff --git a/activerecord/test/cases/migration/rename_table_test.rb b/activerecord/test/cases/migration/rename_table_test.rb
index ba39fb1dec..c8b3f75e10 100644
--- a/activerecord/test/cases/migration/rename_table_test.rb
+++ b/activerecord/test/cases/migration/rename_table_test.rb
@@ -78,11 +78,12 @@ module ActiveRecord
         end
 
         def test_renaming_table_doesnt_attempt_to_rename_non_existent_sequences
-          enable_uuid_ossp!(connection)
+          enable_extension!('uuid-ossp', connection)
           connection.create_table :cats, id: :uuid
           assert_nothing_raised { rename_table :cats, :felines }
           assert connection.table_exists? :felines
         ensure
+          disable_extension!('uuid-ossp', connection)
           connection.drop_table :cats if connection.table_exists? :cats
           connection.drop_table :felines if connection.table_exists? :felines
         end
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 0584df87c6..3161edd58e 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -10,7 +10,7 @@ ActiveRecord::Schema.define do
   #put adapter specific setup here
   case adapter_name
   when "PostgreSQL"
-    enable_uuid_ossp!(ActiveRecord::Base.connection)
+    enable_extension!('uuid-ossp', ActiveRecord::Base.connection)
     create_table :uuid_parents, id: :uuid, force: true do |t|
       t.string :name
     end