Problems with UnitTest on a class with a transaction in it.

rubyonrails-talk
1

Hi, i've problems trying to test a simple class with a transaction in it.

The class is a simple "account" class like this:

class Account < ActiveRecord::Base    def increase(value)      self.value = self.value + value      self.save    end    def decrease(value)      raise ArgumentError,"no founds" if value > self.value      self.value = self.value - value      self.save    end end

and the bank class is this:

class Bank    def transfer(account_1, account_2,value)      begin        Account.transaction do          account_1.increase(value)          account_2.decrease(value)        end      rescue => e        raise e      end    end end

Using the class within the rails application, everything runs smoothly. Trying to transfer an amount that exceed the remaining founds, the class raises an exception and the transaction rollbacks correctly. The class is used inside a bank controller, etc...

But when i try to UnitTest the same class with a test like this:

   def test_transfer_failed      bank = Bank.new      inner = accounts(:one)      outer = accounts(:two)      inner.update_attribute(:value,200)      inner.update_attribute(:value,300)

     assert_raise(ArgumentError) do        bank.transfer(inner,outer,240)      end

     assert_equal 200,inner.value      assert_equal 300,outer.value    end

the test fails, like if the transfer complete and the transaction doesn't rollbacks.

Anyone can explain me why the test fails? Why the class doesn't rollbacks while inside the test?

Any help appreciated,

thanks.

2

Set self.transactional_fixtures = false at the beginning of your test class.

Tests are wrapped in transactions by default so any changes the test makes to the database may be easily rolled back.

jeremy

3

Thank you for the answer, but i've already turned off transactional fixtures in this test.