Avoid exposing ActiveSupport::Testing::NoSkip

It's only meant for Rails internal use.

Author: byroot

activesupport/lib/active_support/testing/no_skip.rb

@@ -8,6 +8,13 @@
 end
 
 if ENV["CI"]
-  require File.join(__dir__, "../activesupport/lib/active_support/testing/no_skip")
-  ActiveSupport::TestCase.include(ActiveSupport::Testing::NoSkip)
+  module DisableSkipping # :nodoc:
+    private
+      def skip(message = nil, *)
+        flunk "Skipping tests is not allowed in this environment (#{message})\n" \
+          "Tests should only be skipped when the environment is missing a required dependency.\n" \
+          "This should never happen on CI."
+      end
+  end
+  ActiveSupport::TestCase.include(DisableSkipping)
 end