Update Gemfile templates to provide correct debugger

railties/lib/rails/generators/rails/app/templates/Gemfile

@@ -23,8 +23,12 @@ source 'https://rubygems.org'
 # gem 'capistrano-rails', group: :development
 
 <% unless  defined?(JRUBY_VERSION) -%>
-# Use debugger
+# To use a debugger
+  <% if  RUBY_VERSION < '2.0.0' -%>
 # gem 'debugger', group: [:development, :test]
+  <% else  -%>
+# gem 'byebug', group: [:development, :test]
+  <% end  -%>
 <% end  -%>
 
 <% if  RUBY_PLATFORM.match(/bccwin|cygwin|emx|mingw|mswin|wince/) -%>

railties/lib/rails/generators/rails/plugin/templates/Gemfile

@@ -38,6 +38,10 @@ end
 
 <% end  -%>
 <% unless  defined?(JRUBY_VERSION) -%>
-# To use debugger
-# gem 'debugger'
+# To use a debugger
+  <% if  RUBY_VERSION < '2.0.0' -%>
+# gem 'debugger', group: [:development, :test]
+  <% else  -%>
+# gem 'byebug', group: [:development, :test]
+  <% end  -%>
 <% end  -%>

railties/test/generators/app_generator_test.rb

@@ -305,14 +305,17 @@ class AppGeneratorTest < Rails::Generators::TestCase
     assert_file "Gemfile", /gem 'jbuilder'/
   end
 
-  def test_inclusion_of_debugger
+  def test_inclusion_of_a_debugger
     run_generator
     if defined?(JRUBY_VERSION)
       assert_file "Gemfile" do |content|
+        assert_no_match(/byebug/, content)
         assert_no_match(/debugger/, content)
       end
-    else
+    elsif RUBY_VERSION < '2.0.0'
       assert_file "Gemfile", /# gem 'debugger'/
+    else
+      assert_file "Gemfile", /# gem 'byebug'/
     end
   end
 

railties/test/generators/plugin_generator_test.rb

@@ -64,14 +64,17 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     assert_file "test/integration/navigation_test.rb", /ActionDispatch::IntegrationTest/
   end
 
-  def test_inclusion_of_debugger
+  def test_inclusion_of_a_debugger
     run_generator [destination_root, '--full']
     if defined?(JRUBY_VERSION)
       assert_file "Gemfile" do |content|
+        assert_no_match(/byebug/, content)
         assert_no_match(/debugger/, content)
       end
-    else
+    elsif RUBY_VERSION < '2.0.0'
       assert_file "Gemfile", /# gem 'debugger'/
+    else
+      assert_file "Gemfile", /# gem 'byebug'/
     end
   end