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class Employee
  def emails
    @emails ||= []
  end
end

class Employee
  def initialize
    @emails = []
  end
end

• Move the initialization logic to the constructor.
• Test

class Employee
  def emails
    @emails ||= []
  end
  
  def voice_mails
    @voice_mails ||= []
  end
end

class Employee
  attr_reader :emails, :voice_mails

  def initialize
    @emails = []
    @voice_mails = []
  end
end