diff --git a/actioncable/test/channel/broadcasting_test.rb b/actioncable/test/channel/broadcasting_test.rb
index b2f8681892..2cbfabc1d0 100644
--- a/actioncable/test/channel/broadcasting_test.rb
+++ b/actioncable/test/channel/broadcasting_test.rb
@@ -1,13 +1,10 @@
 # frozen_string_literal: true
 
 require "test_helper"
-require "active_support/testing/method_call_assertions"
 require "stubs/test_connection"
 require "stubs/room"
 
 class ActionCable::Channel::BroadcastingTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   class ChatChannel < ActionCable::Channel::Base
   end
 
diff --git a/actioncable/test/channel/periodic_timers_test.rb b/actioncable/test/channel/periodic_timers_test.rb
index d6b8992148..0c979f4c7c 100644
--- a/actioncable/test/channel/periodic_timers_test.rb
+++ b/actioncable/test/channel/periodic_timers_test.rb
@@ -4,11 +4,8 @@ require "test_helper"
 require "stubs/test_connection"
 require "stubs/room"
 require "active_support/time"
-require "active_support/testing/method_call_assertions"
 
 class ActionCable::Channel::PeriodicTimersTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   class ChatChannel < ActionCable::Channel::Base
     # Method name arg
     periodically :send_updates, every: 1
diff --git a/actioncable/test/channel/stream_test.rb b/actioncable/test/channel/stream_test.rb
index ed42f1acd4..bfe1f92946 100644
--- a/actioncable/test/channel/stream_test.rb
+++ b/actioncable/test/channel/stream_test.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "test_helper"
-require "active_support/testing/method_call_assertions"
 require "minitest/mock"
 require "stubs/test_connection"
 require "stubs/room"
@@ -164,8 +163,6 @@ module ActionCable::StreamTests
   end
 
   class StreamFromTest < ActionCable::TestCase
-    include ActiveSupport::Testing::MethodCallAssertions
-
     setup do
       @server = TestServer.new(subscription_adapter: ActionCable::SubscriptionAdapter::Async)
       @server.config.allowed_request_origins = %w( http://rubyonrails.com )
diff --git a/actioncable/test/client_test.rb b/actioncable/test/client_test.rb
index 92fe59c803..e5f43488c4 100644
--- a/actioncable/test/client_test.rb
+++ b/actioncable/test/client_test.rb
@@ -7,7 +7,6 @@ require "websocket-client-simple"
 require "json"
 
 require "active_support/hash_with_indifferent_access"
-require "active_support/testing/method_call_assertions"
 
 ####
 # 😷 Warning suppression 😷
@@ -28,8 +27,6 @@ WebSocket::Frame::Data.prepend Module.new {
 ####
 
 class ClientTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   WAIT_WHEN_EXPECTING_EVENT = 2
   WAIT_WHEN_NOT_EXPECTING_EVENT = 0.5
 
diff --git a/actioncable/test/connection/authorization_test.rb b/actioncable/test/connection/authorization_test.rb
index be41d510ff..f77e543435 100644
--- a/actioncable/test/connection/authorization_test.rb
+++ b/actioncable/test/connection/authorization_test.rb
@@ -1,12 +1,9 @@
 # frozen_string_literal: true
 
 require "test_helper"
-require "active_support/testing/method_call_assertions"
 require "stubs/test_server"
 
 class ActionCable::Connection::AuthorizationTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   class Connection < ActionCable::Connection::Base
     attr_reader :websocket
 
diff --git a/actioncable/test/connection/base_test.rb b/actioncable/test/connection/base_test.rb
index 9e480ab60d..6ffa0961bc 100644
--- a/actioncable/test/connection/base_test.rb
+++ b/actioncable/test/connection/base_test.rb
@@ -3,11 +3,8 @@
 require "test_helper"
 require "stubs/test_server"
 require "active_support/core_ext/object/json"
-require "active_support/testing/method_call_assertions"
 
 class ActionCable::Connection::BaseTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   class Connection < ActionCable::Connection::Base
     attr_reader :websocket, :subscriptions, :message_buffer, :connected
 
diff --git a/actioncable/test/connection/client_socket_test.rb b/actioncable/test/connection/client_socket_test.rb
index 07bdc7c52a..9176c7ac8b 100644
--- a/actioncable/test/connection/client_socket_test.rb
+++ b/actioncable/test/connection/client_socket_test.rb
@@ -2,11 +2,8 @@
 
 require "test_helper"
 require "stubs/test_server"
-require "active_support/testing/method_call_assertions"
 
 class ActionCable::Connection::ClientSocketTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   class Connection < ActionCable::Connection::Base
     attr_reader :connected, :websocket, :errors
 
diff --git a/actioncable/test/connection/identifier_test.rb b/actioncable/test/connection/identifier_test.rb
index a7e23b4cd8..707f4bab72 100644
--- a/actioncable/test/connection/identifier_test.rb
+++ b/actioncable/test/connection/identifier_test.rb
@@ -1,13 +1,10 @@
 # frozen_string_literal: true
 
 require "test_helper"
-require "active_support/testing/method_call_assertions"
 require "stubs/test_server"
 require "stubs/user"
 
 class ActionCable::Connection::IdentifierTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   class Connection < ActionCable::Connection::Base
     identified_by :current_user
     attr_reader :websocket
diff --git a/actioncable/test/connection/stream_test.rb b/actioncable/test/connection/stream_test.rb
index daf7c37c79..0f4576db40 100644
--- a/actioncable/test/connection/stream_test.rb
+++ b/actioncable/test/connection/stream_test.rb
@@ -1,13 +1,10 @@
 # frozen_string_literal: true
 
 require "test_helper"
-require "active_support/testing/method_call_assertions"
 require "minitest/mock"
 require "stubs/test_server"
 
 class ActionCable::Connection::StreamTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   class Connection < ActionCable::Connection::Base
     attr_reader :connected, :websocket, :errors
 
diff --git a/actioncable/test/connection/subscriptions_test.rb b/actioncable/test/connection/subscriptions_test.rb
index 7bc8c4241c..902085c5d6 100644
--- a/actioncable/test/connection/subscriptions_test.rb
+++ b/actioncable/test/connection/subscriptions_test.rb
@@ -1,11 +1,8 @@
 # frozen_string_literal: true
 
 require "test_helper"
-require "active_support/testing/method_call_assertions"
 
 class ActionCable::Connection::SubscriptionsTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   class Connection < ActionCable::Connection::Base
     attr_reader :websocket
 
diff --git a/actioncable/test/server/base_test.rb b/actioncable/test/server/base_test.rb
index ad06e7ca3c..d46debea45 100644
--- a/actioncable/test/server/base_test.rb
+++ b/actioncable/test/server/base_test.rb
@@ -3,11 +3,8 @@
 require "test_helper"
 require "stubs/test_server"
 require "active_support/core_ext/hash/indifferent_access"
-require "active_support/testing/method_call_assertions"
 
 class BaseTest < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   def setup
     @server = ActionCable::Server::Base.new
     @server.config.cable = { adapter: "async" }.with_indifferent_access
diff --git a/actioncable/test/subscription_adapter/redis_test.rb b/actioncable/test/subscription_adapter/redis_test.rb
index 523c205dca..3dc995331a 100644
--- a/actioncable/test/subscription_adapter/redis_test.rb
+++ b/actioncable/test/subscription_adapter/redis_test.rb
@@ -4,7 +4,6 @@ require "test_helper"
 require_relative "common"
 require_relative "channel_prefix"
 
-require "active_support/testing/method_call_assertions"
 require "action_cable/subscription_adapter/redis"
 
 class RedisAdapterTest < ActionCable::TestCase
@@ -31,8 +30,6 @@ class RedisAdapterTest::AlternateConfiguration < RedisAdapterTest
 end
 
 class RedisAdapterTest::Connector < ActionCable::TestCase
-  include ActiveSupport::Testing::MethodCallAssertions
-
   test "slices url, host, port, db, and password from config" do
     config = { url: 1, host: 2, port: 3, db: 4, password: 5 }
 
diff --git a/actioncable/test/test_helper.rb b/actioncable/test/test_helper.rb
index 755f7b71b4..ac7881c950 100644
--- a/actioncable/test/test_helper.rb
+++ b/actioncable/test/test_helper.rb
@@ -2,6 +2,7 @@
 
 require "action_cable"
 require "active_support/testing/autorun"
+require "active_support/testing/method_call_assertions"
 
 require "puma"
 require "rack/mock"
@@ -15,6 +16,8 @@ end
 Dir[File.expand_path("stubs/*.rb", __dir__)].each { |file| require file }
 
 class ActionCable::TestCase < ActiveSupport::TestCase
+  include ActiveSupport::Testing::MethodCallAssertions
+
   def wait_for_async
     wait_for_executor Concurrent.global_io_executor
   end