The Cucumber Book, 2nd Edition

How to Synchronize

In our current implementation, the debit and credit transactions are processed synchronously by our simplistic Account class:

support_code/17/lib/nice_bank.rb

class Account
  def credit(amount)
    @balance = amount
  end

  def balance
    @balance
  end

  def debit(amount)
    @balance -= amount
  end
end

This implementation, where the balance is updated during the method call to credit or debit, means that we can be certain the balance will have been updated by the time Cucumber checks the account balance in the final Then step of our scenario.

support_code/17/features/cash_withdrawal.feature

Feature: Cash Withdrawal
  Scenario: Successful withdrawal from an account in credit
 Given my account has ...