Oystercard Challenge

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Customer Requirements

In order to use public transport
As a customer
I want money on my card

In order to keep using public transport
As a customer
I want to add money to my card

In order to protect my money
As a customer
I don't want to put too much money on my card

In order to pay for my journey
As a customer
I need my fare deducted from my card

In order to get through the barriers
As a customer
I need to touch in and out

In order to pay for my journey
As a customer
I need to have the minimum amount for a single journey

In order to pay for my journey
As a customer
I need to pay for my journey when it's complete

In order to pay for my journey
As a customer
I need to know where I've travelled from

In order to know where I have been
As a customer
I want to see to all my previous trips

In order to know how far I have travelled
As a customer
I want to know what zone a station is in

In order to be charged correctly
As a customer
I need a penalty charge deducted if I fail to touch in or out

In order to be charged the correct amount
As a customer
I need to have the correct fare calculated

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Objects & Attributes

• Oystercard
  • @money
  • LIMIT
  • @in_journey
  • @history
  • @entry_station
  • @exit_station
• Touchpad
  • @location ({:location => 'loc', :zone => 1})

• Journey

Objects & Methods

• Oystercard
  • top_up
    • method for user to add money
    • guard clause - check money limit constant
  • deduct_money(val)
    • method to remove money when touch in/out
    • value argument to define how much
  • show_balance
  • touch_in
  • touch_out
  • in_journey
  • history
• Touchpad
  • check_min_balance(oystercard)
    • ask oystercard for balance
    • check it is the right level
  • journey_complete(oystercard)
    • calculate touch in touch out
  • touchpad_zone
    • returns location
• Journey