July 16, 2010 21:17 · Jul 16, 2010
diff --git a/dojo.rb b/dojo.rb
@@ -0,0 +1,116 @@
+require 'rubygems'
+require 'spec'
+
+class Account
+  attr_reader :balance
+  def self.find(pin)
+    Accounts[pin]
+  end
+
+  def initialize(ref,balance=0)
+    @symbol = ref
+    @balance = balance
+  end
+
+  attr_reader :symbol
+
+
+
+  def ==(that)
+    @symbol == that.symbol
+  end
+
+  def withdraw_cash(amount)
+    @balance -= amount
+    amount
+  end
+end
+
+class ATM
+  def initialize
+    @num_attempts = 0
+  end
+
+  def read_pin(pin)
+    account = Account.find(pin)
+    if account.nil?
+      invalid_pin
+    else
+      return account
+    end
+  end
+
+  def invalid_pin
+    @num_attempts += 1
+    if @num_attempts >= 3
+      raise 'O NOES'
+    end
+  end
+end
+
+describe 'an atm' do
+  let (:atm) {ATM.new}
+
+  before(:each) do
+    Account::Accounts = {7643 => Account.new(:alices_account,2000), 5954 => Account.new(:bobes_account,22400), 1562 => Account.new(:clydes_account)}
+
+  end
+
+  describe 'entering a pin' do
+    context 'when a user enters a pin' do
+      it 'returns the account for alice\'s pin' do
+        atm.read_pin(7643).should == Account.new(:alices_account)
+      end
+
+      it 'returns the account for bobes pin' do
+        atm.read_pin(5954).should == Account.new(:bobes_account)
+      end
+
+      it 'returns the account for clyde\'s pin' do
+        atm.read_pin(1562).should == Account.new(:clydes_account)
+      end
+      it 'does not return the account for an invalid pin' do
+        atm.read_pin(:invalid_apin).should be_nil
+      end
+
+      it 'returns the same account twice' do
+        atm.read_pin(1562).should be_eql(atm.read_pin(1562))
+      end
+
+      it 'bobes account is not alices account' do
+        atm.read_pin(1562).should_not be_eql(atm.read_pin(5954))
+      end
+
+
+    end
+
+    context 'making three attempts to enter the pin' do
+      it 'fails after entering the wrong pin 3 times' do
+        2.times { atm.read_pin(:invalid_pin) }
+        lambda { atm.read_pin(:ohmygoshinvalidpin) }.should raise_error
+      end
+    end
+
+  end
+  describe 'withdrawing money' do
+    context 'from alices account' do
+      it 'gives us money' do
+        atm.read_pin(7643).withdraw_cash(80).should == 80
+      end
+
+      it 'debits the account' do
+        account = atm.read_pin(7643)
+        account.withdraw_cash(80)
+        account.balance.should == 2000 - 80
+      end
+
+    end
+    context 'from bobes account' do
+      it 'debits the account' do
+        account = atm.read_pin(5954)
+        account.withdraw_cash(250)
+        account.balance.should == 22400-250
+      end
+    end
+  end
+end