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    <title>Test-First Teaching: learn_ruby: timer</title>
    <link href="../assets/style.css" media="screen" rel="stylesheet" type="text/css" />
    <div class="header">
      <h1><a href="http://testfirst.org">TestFirst.org</a></h1>
      <h2>the home of test-first teaching</h2>
    <div class="nav">
      <h2><a href="../index.html">learn_ruby</a></h2>
      <b>Labs:</b>
        <li><a href="../00_hello/index.html">00 Hello</a></li>
        <li><a href="../01_temperature/index.html">01 Temperature</a></li>
        <li><a href="../02_calculator/index.html">02 Calculator</a></li>
        <li><a href="../03_simon_says/index.html">03 Simon Says</a></li>
        <li><a href="../04_pig_latin/index.html">04 Pig Latin</a></li>
        <li><a href="../05_book_titles/index.html">05 Book Titles</a></li>
        <li>06 Timer</li>
      </ul>
    <h1>timer</h1>
    <div class="content"><div class="rspec_file">  <div class="intro"><h1>Topics</h1>
<li>classes</li>
<li>instance variables</li>
<li>string formats</li>
<li>modular arithmetic</li>
<h1>Timer</h1>
  <div class="tests">
    <h1>Tests</h1>
<a class="raw_file" href="timer_spec.rb">timer_spec.rb</a>
require 'timer'
describe &quot;Timer&quot; do
  before(:each) do
    @timer = Timer.new
  it &quot;should initialize to 0 seconds&quot; do
    expect(@timer.seconds).to eq(0)
  describe 'time_string' do
    it &quot;should display 0 seconds as 00:00:00&quot; do
      @timer.seconds = 0
      expect(@timer.time_string).to eq(&quot;00:00:00&quot;)
    it &quot;should display 12 seconds as 00:00:12&quot; do
      @timer.seconds = 12
      expect(@timer.time_string).to eq(&quot;00:00:12&quot;)
    it &quot;should display 66 seconds as 00:01:06&quot; do
      @timer.seconds = 66
      expect(@timer.time_string).to eq(&quot;00:01:06&quot;)
    it &quot;should display 4000 seconds as 01:06:40&quot; do
      @timer.seconds = 4000
      expect(@timer.time_string).to eq(&quot;01:06:40&quot;)
  # 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')
  #   it 'pads one' do
  #     expect(@timer.padded(1)).to eq('01')
  #   it &quot;doesn't pad a two-digit number&quot; do
  #     expect(@timer.padded(12)).to eq('12')
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