require 'test/unit'
require 'rubygems'
require 'mocha'
require 'stubba'

class Clock
  def current_time
    "The time is now #{Time.now.strftime("%H:%M")}"
  end

  def quarter_time
    now = Time.now
    hour = now.hour
    next_hour = hour == 23 ? 0 : hour + 1
    minute = now.min

    case minute
    when 0..20
      "quarter past #{hour}"
    when 21..40
      "half past #{hour}"
    when 41..59
      "quarter til #{next_hour}"
    end
  end
end

class ClockTest < Test::Unit::TestCase
  def setup
    @clock = Clock.new
  end

  def test_should_return_current_time
    now = Time.now
    now_strftime = now.strftime("%H:%M")
    now.expects(:strftime).with("%H:%M").returns(now_strftime)
    Time.expects(:now).returns(now)

    assert_equal "The time is now #{now_strftime}",
      @clock.current_time
  end

  def test_should_return_quarter_past_quarter_time
    now = Time.now
    time_1212 = Time.local(now.year, now.month, now.day, 12, 12, 0)
    time_1212.expects(:hour).returns(12)
    time_1212.expects(:min).returns(12)
    Time.expects(:now).returns(time_1212)

    assert_equal "quarter past 12", @clock.quarter_time
  end

  def test_should_return_half_past_quarter_time
    now = Time.now
    time_1230 = Time.local(now.year, now.month, now.day, 12, 30, 0)
    time_1230.expects(:hour).returns(12)
    time_1230.expects(:min).returns(30)
    Time.expects(:now).returns(time_1230)

    assert_equal "half past 12", @clock.quarter_time
  end

  def test_should_return_quarter_til_quarter_time
    now = Time.now
    time_1249 = Time.local(now.year, now.month, now.day, 12, 49, 0)
    time_1249.expects(:hour).returns(12)
    time_1249.expects(:min).returns(49)
    Time.expects(:now).returns(time_1249)

    assert_equal "quarter til 13", @clock.quarter_time
  end
end