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Naveen Velkur 6Naveen Velkur 6 

How to write test class for the below trigger?

trigger CountContacts on Contact (after insert, after delete) {
List<Account> addAccCount= new List<Account>();
    Set<Id> addConId= new Set<Id>();
if(trigger.isInsert){
for(Contact con:trigger.new){
addConId.add(con.AccountId);
}
}
if(trigger.isDelete){
for(Contact con:trigger.old){
addConId.add(con.AccountId);
}
}
List<Account> accList=[SELECT Id,CountofContacts__c, (SELECT Id FROM Contacts) FROM Account WHERE Id in: addConId];
for(Account acc:accList){
acc.CountofContacts__c = acc.Contacts.size();
addAccCount.add(acc);
}
Update addAccCount;
}
if(trigger.isDelete){
for(Contact con:trigger.old){
addConId.add(con.AccountId);
}
}
List<Account> accList=[SELECT Id,CountofContacts__c, (SELECT Id FROM Contacts) FROM Account WHERE Id in: addConId];
for(Account acc:accList){
acc.CountofContacts__c = acc.Contacts.size();
addAccCount.add(acc);
}
Update addAccCount;
}
Best Answer chosen by Naveen Velkur 6
Prateek Prasoon 25Prateek Prasoon 25
@isTest
private class CountContactsTest {
    static testMethod void testCountContacts() {
        // create test accounts
        List<Account> accounts = new List<Account>();
        for(Integer i = 0; i < 2; i++) {
            accounts.add(new Account(Name = 'Test Account ' + i));
        }
        insert accounts;
        // create test contacts
        List<Contact> contacts = new List<Contact>();
        for(Integer i = 0; i < 4; i++) {
            contacts.add(new Contact(FirstName = 'Test', LastName = 'Contact ' + i, AccountId = accounts[i/2].Id));
        }
        insert contacts;
        // test trigger on insert
        Test.startTest();
        insert new Contact(FirstName = 'Test', LastName = 'New Contact', AccountId = accounts[0].Id);
        Test.stopTest();
        List<Account> updatedAccounts = [SELECT Id, CountofContacts__c FROM Account WHERE Id IN :accounts];
        System.assertEquals(2, updatedAccounts.size());
        System.assertEquals(2, updatedAccounts[0].CountofContacts__c);
        System.assertEquals(2, updatedAccounts[1].CountofContacts__c);
        // test trigger on delete
        Test.startTest();
        delete [SELECT Id FROM Contact WHERE AccountId = :accounts[0].Id];
        Test.stopTest();
        updatedAccounts = [SELECT Id, CountofContacts__c FROM Account WHERE Id IN :accounts];
        System.assertEquals(2, updatedAccounts.size());
        System.assertEquals(0, updatedAccounts[0].CountofContacts__c);
        System.assertEquals(2, updatedAccounts[1].CountofContacts__c);
    }

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All Answers

Prateek Prasoon 25Prateek Prasoon 25
@isTest
private class CountContactsTest {
    static testMethod void testCountContacts() {
        // create test accounts
        List<Account> accounts = new List<Account>();
        for(Integer i = 0; i < 2; i++) {
            accounts.add(new Account(Name = 'Test Account ' + i));
        }
        insert accounts;
        // create test contacts
        List<Contact> contacts = new List<Contact>();
        for(Integer i = 0; i < 4; i++) {
            contacts.add(new Contact(FirstName = 'Test', LastName = 'Contact ' + i, AccountId = accounts[i/2].Id));
        }
        insert contacts;
        // test trigger on insert
        Test.startTest();
        insert new Contact(FirstName = 'Test', LastName = 'New Contact', AccountId = accounts[0].Id);
        Test.stopTest();
        List<Account> updatedAccounts = [SELECT Id, CountofContacts__c FROM Account WHERE Id IN :accounts];
        System.assertEquals(2, updatedAccounts.size());
        System.assertEquals(2, updatedAccounts[0].CountofContacts__c);
        System.assertEquals(2, updatedAccounts[1].CountofContacts__c);
        // test trigger on delete
        Test.startTest();
        delete [SELECT Id FROM Contact WHERE AccountId = :accounts[0].Id];
        Test.stopTest();
        updatedAccounts = [SELECT Id, CountofContacts__c FROM Account WHERE Id IN :accounts];
        System.assertEquals(2, updatedAccounts.size());
        System.assertEquals(0, updatedAccounts[0].CountofContacts__c);
        System.assertEquals(2, updatedAccounts[1].CountofContacts__c);
    }

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This was selected as the best answer
Arun Kumar 1141Arun Kumar 1141
Hi Naveen,

1. Trigger Class 
trigger CountContacts on Contact (after insert, after delete) {
    if (Trigger.isInsert) { 
        CountContactsHandler.handleContacts(Trigger.new);
    } 
    if (Trigger.isDelete) {   
        CountContactsHandler.handleContacts(Trigger.old);
    }  
}
2. Handler Class 
public class CountContactsHandler {
    public static void handleContacts(List<Contact> conList) {
        try{ 
            Set<Id> accountIds = new Set<Id>(); 
            for (Contact con : conList) {   
                accountIds.add(con.AccountId);
            }
            List<Account> accList = [SELECT Id, CountofContacts__c, (SELECT Id FROM Contacts) FROM Account WHERE Id IN :accountIds];
            for (Account acc : accList) {
                acc.CountofContacts__c = acc.Contacts.size();
            } 
            update accList;
        } 
        catch (Exception e) {
            System.debug('Exception occurred in handleContacts: ' + e.getMessage());
        }
    }
}

3. Test Class 
@isTest public class CountContactsHandlerTest {
    @isTest static void testHandleContacts() {
        List<Account> accList = new List<Account>();
        for (Integer i = 0; i < 2; i++) {
            Account acc = new Account(Name = 'Test Account ' + i); 
            accList.add(acc);
        }
        insert accList;
        List<Contact> conList = new List<Contact>();
        for (Integer i = 0; i < 2; i++) {
            Contact con = new Contact(FirstName = 'Test', LastName = 'Contact ' + i, AccountId = accList[i].Id);
            conList.add(con); 
        }
        insert conList;
        List<Account> updatedAccList = [SELECT Id, CountofContacts__c FROM Account WHERE Id IN :accList];
        for (Account acc : updatedAccList) {
            System.assertEquals(1, acc.CountofContacts__c);
        }
        delete conList;
        
        updatedAccList = [SELECT Id, CountofContacts__c FROM Account WHERE Id IN :accList];
        for (Account acc : updatedAccList) {
            System.assertEquals(0, acc.CountofContacts__c);
        }
    }
}
Hope this will help.
Thanks!