Issue about Ruby class Timer in rspec -

i ruby newbie trying create class timer following rspec:

require 'timer'  describe "timer"   before(:each)     @timer = timer.new   end    "should initialize 0 seconds"     @timer.seconds.should == 0   end    describe 'time_string'     "should display 0 seconds 00:00:00"       @timer.seconds = 0       @timer.time_string.should == "00:00:00"     end      "should display 12 seconds 00:00:12"       @timer.seconds = 12       @timer.time_string.should == "00:00:12"     end      "should display 66 seconds 00:01:06"       @timer.seconds = 66       @timer.time_string.should == "00:01:06"     end      "should display 4000 seconds 01:06:40"       @timer.seconds = 4000       @timer.time_string.should == "01:06:40"     end   end 

but don't understand rspec's return error message, says "timer should initialize 0 seconds", stuck @ beginning code , appreciate can explain what's wrong code below. thanks.

class timer     def intialize(seconds)         @seconds = seconds     end     def seconds=(new_seconds = 0)         @seconds = new_seconds     end     def seconds         @seconds     end end 

i think initialize method should take optional argument:

class timer   def initialize(seconds = 0)     @seconds = seconds   end   def seconds=(new_seconds)     @seconds = new_seconds   end end