Automating Salesforce Approval Processes with Apex Triggers

Ran across this the other day and wanted to re-post it, looks easy enough to implement...

http://blog.jeffdouglas.com/2010/01/04/automating-salesforce-approval-processes-with-apex-triggers/

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trigger OpportunitySubmitForApproval on Opportunity (after update) {
 
 for (Integer i = 0; i < Trigger.new.size(); i++) {
 
  if (Trigger.old[i].Probability < 30 && Trigger.new[i].Probability >= 30) {
 
   // create the new approval request to submit
   Approval.ProcessSubmitRequest req = new Approval.ProcessSubmitRequest();
   req.setComments('Submitted for approval. Please approve.');
   req.setObjectId(Trigger.new[i].Id);
   // submit the approval request for processing
   Approval.ProcessResult result = Approval.process(req);
   // display if the reqeust was successful
   System.debug('Submitted for approval successfully: '+result.isSuccess());
 
  }
 
 }
 
}

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@isTest
private class TestOpportunitySubmitForApproval {
 
    static testMethod void testApprovalSuccess() {
 
        Opportunity opp = new Opportunity();
        opp.Name = 'Test Opp';
        opp.Amount = 100;
        opp.CloseDate = Date.today();
        opp.Probability = 10;
        opp.StageName = 'Prospecting';
        // insert the new opp
        insert opp;
        // change the probability of the opp so the trigger submits it for approval
 opp.Probability = 40;
 // update the opp which should submit it for approval
 update opp;
 
        // ensure that the opp was submitted for approval
        List<ProcessInstance> processInstances = [select Id, Status from ProcessInstance where TargetObjectId = :opp.id];
 System.assertEquals(processInstances.size(),1);
 
    }
 
}