require 'generators/generators_test_helper' require 'generators/rails/metal/metal_generator' class MetalGeneratorTest < Rails::Generators::TestCase include GeneratorsTestHelper arguments %w(foo) def test_metal_skeleton_is_created run_generator assert_file "app/metal/foo.rb", /class Foo/ end def test_check_class_collision content = capture(:stderr){ run_generator ["object"] } assert_match /The name 'Object' is either already used in your application or reserved/, content end end