gistfile1.js

var vows = require('vows'),
    assert = require('assert'),
    ATM = require('./atm').ATM;

vows.describe("Sufficient cash").addBatch({
    "When user owns 100 dollars in the bank": {
         "and user wants to withdraw 20 dollars from ATM": {
             topic: function() { var atm = new ATM(); atm.deposit(100); return atm.withdraw(20);},
             "should get 20 dollars from ATM and leave 80 dollars in the account.": function(result) {
                 assert (result === 20);
             }
         }
    }
}).export(module);

vows.describe("Insufficient cash").addBatch({
    "When user owns 100 dollars in the bank": {
         "and user wants to withdraw 20 dollars from ATM": {
             topic: function() { var atm = new ATM(); atm.deposit(100); return atm.withdraw(120);},
             "should not get any money from ATM and ATM should raise an Error.": function(result) {
                 assert.throws (result, Error);
             }
         }
    }
}).export(module);