Hi,

- Sorry to bother, but I found no answer to this wuestion either on the web, or in the dev forum, or in the Apex documentation - 

I have a trigger, which detects error conditions and feeds errors to the class or field.

This gives a nice result interactively, in the GUI.

But how do I write test code to catch these errors ?  Is there a System.AssertException(), or the equivalent ? 

trigger createOrder on Asset (after insert, after update) {[...] if (price.get(a.Product2Id) == NULL) { System.debug(' error : no active price'); a.Product2Id.addError('no active price on the Product'); }[...]}