Question

我有RSpec问题。根据那个问题，我在ruby中写了一个解决方案。但是当使用RSpec运行我期望得到一个值时，我得到nil这里是RSpec

require 'timer'

describe "Timer" do
  before(:each) do
    @timer = Timer.new
  end

  it "should initialize to 0 seconds" do
    expect(@timer.seconds).to eq(0)
  end

  describe 'time_string' do
    it "should display 0 seconds as 00:00:00" do
      @timer.seconds = 0
      expect(@timer.time_string).to eq("00:00:00")
    end

    it "should display 12 seconds as 00:00:12" do
      @timer.seconds = 12
      expect(@timer.time_string).to eq("00:00:12")
    end

    it "should display 66 seconds as 00:01:06" do
      @timer.seconds = 66
      expect(@timer.time_string).to eq("00:01:06")
    end

    it "should display 4000 seconds as 01:06:40" do
      @timer.seconds = 4000
      expect(@timer.time_string).to eq("01:06:40")
    end
  end

这是我写的解决方案：

class Timer
     attr_accessor :seconds, :time_string


    def seconds=(num)
     @seconds=num
   end #seconds


     def time_string
       s=@seconds%60
       m=@seconds/60
       h=m/60
       m=m%60
       @time_string="%02d:%02d:%02d" %[h,m,s]
     end #time_string
end #class

我收到错误

 Failure/Error: expect(@timer.seconds).to eq(0)

       expected: 0
            got: nil

Answer 1

那是因为你在没有任何参数的情况下初始化Timer.new。因此，seconds为nil

您需要：

before(:each) do
  @timer = Timer.new
  @timer.seconds = 0
end

或实现初始化程序：

class Timer
  attr_accessor :seconds, :time_string

  def initialize
    @seconds = 0
  end
  ...

Ruby返回意外的零

1 个答案: