Fix tests to reflect IdentityMap no longer default

Broke in 0e1dcae1

railties/test/application/initializers/frameworks_test.rb

@@ -166,7 +166,7 @@ def from_bar_helper
 
       require "#{app_path}/config/environment"
 
-      expects = [ActiveRecord::IdentityMap::Middleware, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActiveRecord::SessionStore]
+      expects = [ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActiveRecord::SessionStore]
       middleware = Rails.application.config.middleware.map { |m| m.klass }
       assert_equal expects, middleware & expects
     end

railties/test/application/middleware_test.rb

@@ -30,7 +30,6 @@ def app
         "Rack::Sendfile",
         "ActionDispatch::Reloader",
         "ActionDispatch::Callbacks",
-        "ActiveRecord::IdentityMap::Middleware",
         "ActiveRecord::ConnectionAdapters::ConnectionManagement",
         "ActiveRecord::QueryCache",
         "ActionDispatch::Cookies",
@@ -121,6 +120,7 @@ def app
     end
 
     test "identity map is inserted" do
+      add_to_config "config.active_record.identity_map = true"
       boot!
       assert middleware.include?("ActiveRecord::IdentityMap::Middleware")
     end