Use is_callable instead of method_exists to check for setup/teardown #360
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…methods `method_exists` will return true even if an object has a protected method; calling it from Resque will then fail. `is_callable` only returns true when the method both exists and can be called externally.
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method_existswill return true even if an object has a protected method; calling it from Resque will then fail.is_callableonly returns true when the method both exists and can be called externally.