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This class provides a TestCase for testing generators. To setup, you need just to configure the destination and set which generator is being tested: 

  class AppGeneratorTest < Rails::Generators::TestCase
    tests AppGenerator
    destination File.expand_path("../tmp", File.dirname(__FILE__))
  end

If you want to ensure your destination root is clean before running each test, you can set a setup callback: 

  class AppGeneratorTest < Rails::Generators::TestCase
    tests AppGenerator
    destination File.expand_path("../tmp", File.dirname(__FILE__))
    setup :prepare_destination
  end
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