spec/observers/user_observer_spec.rb

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require 'spec_helper'

describe UserObserver do
  it 'does not blow up when you initialize it' do
    # Observers are singletons so we cannot use #new
    # * Observers provide the #instance method that instantiates & registers it
    # * See http://api.rubyonrails.org/v3.2.13/classes/ActiveRecord/Observer.html
    foo = UserObserver.instance
  end
end