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Convert specs to RSpec 3.1.7 syntax with Transpec

This conversion is done by Transpec 2.3.7 with the following command:
    transpec -s

* 2 conversions
    from: describe 'some controller' { }
      to: describe 'some controller', :type => :controller { }

For more details: https://github.com/yujinakayama/transpec#supported-conversions