RubyでprivateメソッドをRspec等で呼び出す方法

結論 sendメソッドを使おう！

class User
  def greet(name)
    "Hello, #{name}!"
  end

  private

  def secret_method
    "This is a secret!"
  end
end

user = User.new
puts user.send(:greet, "Alice")  # => "Hello, Alice!"
puts user.send(:secret_method)   # => "This is a secret!"