Added tests for #3751

railties/lib/rails/generators/actions.rb

@@ -68,7 +68,7 @@ def gem(*args)
         end
 
         in_root do
-          str = "gem #{parts.join(", ")}\n"
+          str = "\ngem #{parts.join(", ")}\n"
           str = "  " + str if @in_group
           append_file "Gemfile", str, :verbose => false
         end

railties/test/generators/actions_test.rb

@@ -113,7 +113,7 @@ def test_gem_group_should_wrap_gems_in_a_group
       gem 'fakeweb'
     end
 
-    assert_file 'Gemfile', /\ngroup :development, :test do\n  gem "rspec-rails"\nend\n\ngroup :test do\n  gem "fakeweb"\nend/
+    assert_file 'Gemfile', /\ngroup :development, :test do\n  \ngem "rspec-rails"\nend\n\ngroup :test do\n  \ngem "fakeweb"\nend/
   end
 
   def test_environment_should_include_data_in_environment_initializer_block