Apex Approval Processing Example

1public class TestApproval {
2    void submitAndProcessApprovalRequest() {
3        // Insert an account
4        Account a = new Account(Name='Test',annualRevenue=100.0);
5        insert a;
6           
7        User user1 = [SELECT Id FROM User WHERE Alias='SomeStandardUser'];
8            
9        // Create an approval request for the account
10        Approval.ProcessSubmitRequest req1 = 
11            new Approval.ProcessSubmitRequest();
12        req1.setComments('Submitting request for approval.');
13        req1.setObjectId(a.id);
14        
15        // Submit on behalf of a specific submitter
16        req1.setSubmitterId(user1.Id); 
17        
18        // Submit the record to the existing process named PTO_Request_Process
19        req1.setProcessDefinitionNameOrId('PTO_Request_Process');
20        
21        // Skip the criteria evaluation for the specified process
22        req1.setSkipEntryCriteria(true);
23        
24        // Submit the approval request for the account
25        Approval.ProcessResult result = Approval.process(req1);
26        
27        // Verify the result
28        System.assert(result.isSuccess());
29        
30        System.assertEquals(
31            'Pending', result.getInstanceStatus(), 
32            'Instance Status'+result.getInstanceStatus());
33        
34        // Approve the submitted request
35        // First, get the ID of the newly created item
36        List<Id> newWorkItemIds = result.getNewWorkitemIds();
37        
38        // Instantiate the new ProcessWorkitemRequest object and populate it
39        Approval.ProcessWorkitemRequest req2 = 
40            new Approval.ProcessWorkitemRequest();
41        req2.setComments('Approving request.');
42        req2.setAction('Approve');
43        req2.setNextApproverIds(new Id[] {UserInfo.getUserId()});
44        
45        // Use the ID from the newly created item to specify the item to be worked
46        req2.setWorkitemId(newWorkItemIds.get(0));
47        
48        // Submit the request for approval
49        Approval.ProcessResult result2 =  Approval.process(req2);
50        
51        // Verify the results
52        System.assert(result2.isSuccess(), 'Result Status:'+result2.isSuccess());
53        
54        System.assertEquals(
55            'Approved', result2.getInstanceStatus(), 
56            'Instance Status'+result2.getInstanceStatus());
57    }
58}