timer_spec.rb

# # Topics
#
# * classes
# * instance variables
# * string formats
# * modular arithmetic
#
# # Timer

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


  # One way to implement the Timer is with a helper method.
  # Uncomment these specs if you want to test-drive that
  # method, then call that method from inside of time_string.
  
  describe 'padded' do
    it 'pads zero' do
      expect(@timer.padded(0)).to eq('00')
    end
    it 'pads one' do
      expect(@timer.padded(1)).to eq('01')
    end
    it "doesn't pad a two-digit number" do
      expect(@timer.padded(12)).to eq('12')
    end
  end

end