putting the file in the gemset instead

Gemfile

@@ -77,6 +77,19 @@ end
 
 # For running unit tests
 group :test do
+
+  if defined?(RUBY_ENGINE) && RUBY_ENGINE == "ruby"
+    module Kernel
+      alias :_at_exit :at_exit
+      def at_exit(&block)
+        _at_exit do
+        exit_status = $!.status if $!.is_a?(SystemExit)
+        block.call
+        exit exit_status if exit_status
+      end
+      end
+    end
+  end
   if ENV['BEEF_TEST']
     gem 'test-unit'
     gem 'test-unit-full'

Rakefile

@@ -6,18 +6,6 @@
 require 'yaml'
 #require 'pry-byebug'
 
-if defined?(RUBY_ENGINE) && RUBY_ENGINE == "ruby"
-  module Kernel
-    alias :_at_exit :at_exit
-    def at_exit(&block)
-      _at_exit do
-      exit_status = $!.status if $!.is_a?(SystemExit)
-      block.call
-      exit exit_status if exit_status
-    end
-    end
-  end
-end
 
 task :default => ["quick"]