ruby on rails - How to use rspec to test a transaction block -

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i wrapping code in transaction block i.e.

tip.transaction   ...make changes lots of tips... end

the reason doing want make sure changes made before being committed database. how use rspec test if failure occurs before transaction completed, database rollback previous state?

you can check no tip persisted in case of failure. doubt here failing tip means you, since that's reproduce in test. plain vanilla example:

# app/models/tip.rb before_save :fail_if_bad_amoun def fail_if_bad_amount   fail badamount if amount == 'bad' end  def self.process(tips)   tip.transaction     tips.all? &:save   end end  # spec/models/tip_spec.rb "does not commit in case of failure in 1 of tips"   good_tip = tip.new(amount: 1_000)   bad_tip  = tip.new(amount: 'bad')    expect     tip.process([good_tip, bad_tip])   end.not_to change { tip.count } end

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