Only load SystemTestCase if Capybara is defined

For applications that are upgrading or applications that are choosing to
skip system testing Capbyara will not be available. SystemTestCase and
friends shoud only be loaded if Capbyara is defined.

Fixes #28094

1 files changed, 10 insertions, 5 deletions

diff --git a/railties/lib/rails/test_help.rb b/railties/lib/rails/test_help.rb
index 75171f2395..09931c108a 100644
--- a/railties/lib/rails/test_help.rb
+++ b/railties/lib/rails/test_help.rb
@@ -7,11 +7,14 @@ require "active_support/test_case"
 require "action_controller"
 require "action_controller/test_case"
 require "action_dispatch/testing/integration"
-require "action_dispatch/system_test_case"
 require "rails/generators/test_case"
 
 require "active_support/testing/autorun"
 
+if defined?(Capbyara)
+  require "action_dispatch/system_test_case"
+end
+
 if defined?(ActiveRecord::Base)
   ActiveRecord::Migration.maintain_test_schema!
 
@@ -46,9 +49,11 @@ class ActionDispatch::IntegrationTest
   end
 end
 
-class ActionDispatch::SystemTestCase
-  def before_setup # :nodoc:
-    @routes = Rails.application.routes
-    super
+if defined? Capybara
+  class ActionDispatch::SystemTestCase
+    def before_setup # :nodoc:
+      @routes = Rails.application.routes
+      super
+    end
   end
 end