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Cynthia HancockCynthia Hancock 

I need help writing a test class for my Apex trigger

Hi All, 

New to writing triggers and test classes. Can anyone help me write a test class for the trigger below?
trigger lastactassigned on task(after insert) {
  map<id,contact> contacts = new map<id,contact>();
  map<id,account> accounts = new map<id,account>();
  for(task record:trigger.new) {
    if(record.ownerid.getsobjecttype()==user.sobjecttype) {
      if(record.whoid!=null&&record.whoid.getsobjecttype()==contact.sobjecttype) {
        contacts.put(record.whoid,new contact(id=record.whoid,LastActivityAssignedTo__c=record.ownerid));
      if(record.accountid!=null) {
        accounts.put(record.accountid,new account(id=record.accountid,LastActivityAssignedTo__c=record.ownerid));
  update contacts.values();
  update accounts.values();

Thank you!
Amit Chaudhary 8Amit Chaudhary 8
Please check below post to learn about test class and Sample test class
1) http://amitsalesforce.blogspot.com/search/label/Test%20Class
2) http://amitsalesforce.blogspot.com/2015/06/best-practice-for-test-classes-sample.html

Please try below Test class as sample
public class lastactassignedTest 
    static testMethod void testMethod1() 
		Account acc = new Account();
		acc.name ='Test';
		// add all required field
		insert acc;
		Contact cont = new Contact();
		cont.LastName ='Test';
		cont.FirstName ='New';
		cont.Accountid = acc.id;
		// Add all required field
		insert cont;
		Task t = new Task(subject='test', ActivityDate=Date.Today(),Status='Not Started',Priority='Normal',whoid = cont.id);
		insert t;

Please follow below salesforce Best Practice for Test Classes :-

1. Test class must start with @isTest annotation if class class version is more than 25
2. Test environment support @testVisible , @testSetUp as well
3. Unit test is to test particular piece of code working properly or not .
4. Unit test method takes no argument ,commit no data to database ,send no email ,flagged with testMethod keyword .
5. To deploy to production at-least 75% code coverage is required 
6. System.debug statement are not counted as a part of apex code limit.
7. Test method and test classes are not counted as a part of code limit
9. We should not focus on the  percentage of code coverage ,we should make sure that every use case should covered including positive, negative,bulk and single record .
  • Single Action -To verify that the the single record produces the correct an expected result .
  • Bulk action -Any apex record trigger ,class or extension must be invoked for 1-200 records .
  • Positive behavior : Test every expected behavior occurs through every expected permutation , i,e user filled out every correctly data and not go past the limit .
  • Negative Testcase :-Not to add future date , Not to specify negative amount.
  • Restricted User :-Test whether a user with restricted access used in your code .
10. Test class should be annotated with @isTest .
11 . @isTest annotation with test method  is equivalent to testMethod keyword .
12. Test method should static and no void return type .
13. Test class and method default access is private ,no matter to add access specifier .
14. classes with @isTest annotation can't be a interface or enum .
15. Test method code can't be invoked by non test request .
16. Stating with salesforce API 28.0 test method can not reside inside non test classes .
17. @Testvisible annotation to make visible private methods inside test classes.
18. Test method can not be used to test web-service call out . Please use call out mock .
19. You can't  send email from test method.
20.User, profile, organization, AsyncApexjob, Corntrigger, RecordType, ApexClass, ApexComponent ,ApexPage we can access without (seeAllData=true) .
21. SeeAllData=true will not work for API 23 version eailer .
22. Accessing static resource test records in test class e,g List<Account> accList=Test.loadData(Account,SobjectType,'ResourceName').
23. Create TestFactory class with @isTest annotation to exclude from organization code size limit .
24. @testSetup to create test records once in a method  and use in every test method in the test class .
25. We can run unit test by using Salesforce Standard UI,Force.com IDE ,Console ,API.
26. Maximum number of test classes run per 24 hour of period is  not grater of 500 or 10 multiplication of test classes of your organization.
27. As apex runs in system mode so the permission and record sharing are not taken into account . So we need to use system.runAs to enforce record sharing .
28. System.runAs will not enforce user permission or field level permission .
29. Every test to runAs count against the total number of DML issued in the process .

Please let us know if this post will help you
Cynthia HancockCynthia Hancock
Thank you Amit!

I am getting this error when I 'Run Test'.

System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, lastactassigned: execution of AfterInsert caused by: System.DmlException: Update failed. First exception on row 0 with id 0034100000327cRAAQ; first error: FIELD_INTEGRITY_EXCEPTION, Last Activity Assigned To: id value of incorrect type: 00541000000chr1AAA: [LastActivityAssignedTo__c] Trigger.lastactassigned: line 14, column 1: [

I appreciate your help. 
sathishkumar periyasamysathishkumar periyasamy
@cynthia, Can you please confirm what is lookup field object name for "LastActivityAssignedTo__c" on the account object? As per my understanding, it is lookup(User) on the account.
sathishkumar periyasamysathishkumar periyasamy
Cynthia, I have followed same process in my dev org and worked fine without any issue. Please find step

1. Created new field "LastActivityAssignedTo__c" on Account Object
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2. Created new field "LastActivityAssignedTo__c" on Contact Object
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3. Created triiger on the Task Object.
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4. Create Tested call as mentioned above.
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5. Test class ran without any issue.
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Please let me know if you have any question.