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ColaCola 

Trigger Test class not working: Trigger on Task to update Contact custom field

Hi, I've created a trigger on a task that I want to use to update a custom contact field. I found documentation on how to create the trigger (http://salesforce.stackexchange.com/questions/23055/trigger-to-update-custom-field-from-another-custom-field-on-a-separate-object). However, When I run the test class I get an Assertion Failed Error: System.AssertException: Assertion Failed: Expected: 2014-05-29 00:00:00, Actual:
null.

I am unsure of where my error lies and hoping someone can help.

Trigger Code:

trigger UpdateInTouchDate on Task (after insert, after update) {
Set<String> whoIds = new Set<String>();

    for (Task t : Trigger.new) {
         whoIds.add(t.WhoId);
    }

    List<Contact> cons = [SELECT Id, In_Touch_Date__c FROM Contact WHERE Id =: whoIds];
   
    Map<String, Task> taskMap = new Map<String, Task>();

    for (Task t : Trigger.new){
        taskMap.put(t.WhoId, t);
    }
        
    for (Contact c : cons) {
    if (taskMap.containsKey(c.Id)) {
         c.In_Touch_Date__c = taskMap.get(c.Id).ActivityDate;
    }
}
update cons;
} 

Trigger Test Class: 

@isTest
private class TestUpdateTouchDate {

static testMethod void testUpdateInTouch() {
 
  Contact c = new Contact(FirstName = 'Test', LastName = 'Test');
  insert c;
 
  Date d = Date.newInstance(2014, 5, 29);
  Task t = new Task(ActivityDate = d);
  System.debug('Date before updating in touch date: ' + t.ActivityDate );
  insert t;
 
  List<Task> task = [SELECT ActivityDate FROM Task WHERE Id =:t.Id];
 
  if (task.size() > 0) {
       t = task.get(0);
  }
 
      System.debug('Price after trigger fired: ' + t.ActivityDate);
 
     System.assertEquals(t.ActivityDate, c.In_Touch_Date__c); 
   }
}

Best Answer chosen by Cola
Vinit_KumarVinit_Kumar
The issue here is you are not associating task with contact in your test class.Try below code :-

@isTest
private class TestUpdateTouchDate {

static testMethod void testUpdateInTouch() {
 
  Contact c = new Contact(FirstName = 'Test', LastName = 'Test');
  insert c;
 
  Date d = Date.newInstance(2014, 5, 29);
  Task t = new Task(ActivityDate = d,WhoId=c.id,Status='Not Started',Priority='Normal'); //Associating with contact
  System.debug('Date before updating in touch date: ' + t.ActivityDate );
  insert t;
 
  // Query on Contact as the Trigger is populating Contact field
  List<Contact> con = [SELECT In_Touch_Date__c FROM Contact WHERE Id =:c.Id limit 1];
 
  if (task.size() > 0) {
       t = task.get(0);
  }
 
      System.debug('Price after trigger fired: ' + t.ActivityDate);
 
     System.assertEquals(t.ActivityDate, con[0].In_Touch_Date__c); 
   }
}

If this helps,please mark this as best answer to help others :)

All Answers

Vinit_KumarVinit_Kumar
The issue here is you are not associating task with contact in your test class.Try below code :-

@isTest
private class TestUpdateTouchDate {

static testMethod void testUpdateInTouch() {
 
  Contact c = new Contact(FirstName = 'Test', LastName = 'Test');
  insert c;
 
  Date d = Date.newInstance(2014, 5, 29);
  Task t = new Task(ActivityDate = d,WhoId=c.id,Status='Not Started',Priority='Normal'); //Associating with contact
  System.debug('Date before updating in touch date: ' + t.ActivityDate );
  insert t;
 
  // Query on Contact as the Trigger is populating Contact field
  List<Contact> con = [SELECT In_Touch_Date__c FROM Contact WHERE Id =:c.Id limit 1];
 
  if (task.size() > 0) {
       t = task.get(0);
  }
 
      System.debug('Price after trigger fired: ' + t.ActivityDate);
 
     System.assertEquals(t.ActivityDate, con[0].In_Touch_Date__c); 
   }
}

If this helps,please mark this as best answer to help others :)
This was selected as the best answer
ColaCola
Thank you this fixed my problem immediately! I had to make a couple minor changes but all the logic was there. I've posted my final test code below: 

@isTest
private class TestUpdateTouchDate {

static testMethod void testUpdateInTouch() {

  Contact c = new Contact(FirstName = 'Test', LastName = 'Test');
  insert c;

  Date d = Date.newInstance(2014, 5, 29);
  Task t = new Task(ActivityDate = d, WhoId=c.id, Status='Not Started',Priority='Normal'); //Associating with contact
  System.debug('Date before updating in touch date: ' + t.ActivityDate );
  insert t;

  // Query on Contact as the Trigger is populating Contact field
  List<Contact> con = [SELECT In_Touch_Date__c FROM Contact WHERE Id =:c.Id limit 1];

  if (con.size() > 0) {
       c = con.get(0);
  }

      System.debug('Price after trigger fired: ' + t.ActivityDate);

     System.assertEquals(t.ActivityDate, con[0].In_Touch_Date__c);
   }
}