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Chris987654321Chris987654321 

Writing test methods to execute a Catch

If I have a try/catch block which does an update to the Database, how do I write a test method to execute the catch? It seems I would have to force the update to fail? 
 
  //Save the information entered in by the student             
   try {    
       //save the changes that the student made on the form            
        update enrollment;   
  } 
 
 catch(System.DMLException e) {
       ApexPages.addMessages(e);     
       System.debug(e);
       return null;
}    
 
 
Message Edited by Chris987654321 on  08-09-2009 07:21 PM
Message Edited by Chris987654321 on  08-09-2009 07:23 PM


CRM JediCRM Jedi
I don't like this but I would normally throw an error to cover the exceptions. This is controlled by a variable so that the error will only be thrown when testmethod is running.


wesnoltewesnolte
Hey
 
There are a few ways to force a DMLException on update. I don't know all of them but some are:
 
1. Duplicate a unique field in a record eg. insert a record with a certain name, and then try update another with the same name
2.  Don't specify a required field.
3. Delete the record before you try the update.
4. Specify the incorrect field type eg. try to put a string in a number field (not 100% sure this is a DML exception. Might be some sort of cast exception).
 
Ask yourself what conditions did you anticipate in writing this exception, and then try fake them.
 
Cheers,
Wes