Trigger – Example 1

Use Case:

Write a trigger, when a new Account is created then create a contact related to that account.

Hint: Contact would be inserted after the account has been inserted.

// Since Contact would be created after Account is inserted,
// so here we would use “After Insert”
trigger AccountTrigger on Account (after insert) {
    // Check for the context variables which would tell us that 
    // code should run only for “After Insert”
    if(Trigger.isAfter && Trigger.isInsert) {
        // Declare a List of Contacts.
        List<Contact> contacts = new List<Contact>();
        
        // Loop for each account which was inserted.
        for(Account account : Trigger.new) {
            // Add the contact which needs to be inserted in the list of Contacts.
            Contact newContact = new Contact(LastName=account.Name+‘ Con’, AccountId=account.Id);
            contacts.add(newContact);
        }
        // Now insert all the contacts together.
        insert contacts;
    }
}

Test Class: We will insert an account and then verify if the contact for that account has been created or not.

@isTest
private class AccountTriggerTest {
    @isTest
    static void accountTrigger_afterInsertTest() {
        // Create an instance of Account
        Account account = new Account(Name=‘TestAccount1’, Type=‘Prospect’);
        
        // Perform test
        Test.startTest();
            insert account;
        Test.stopTest();
        
        // Fetch the account that we have inserted above.
        Account insertedAccount = [Select Id, Name From Account LIMIT 1];
        
        // Fetch the Contact for the above account and assert that a contact should be created
        // also we are verifying the Account Name
        List<Contact> insertedContacts = [Select Id, Account.Name From Contact];
        System.assertEquals(1, insertedContacts.size(), ‘Only 1 Contact should present’);
        System.assertEquals(insertedAccount.Name, insertedContacts[0].Account.Name, 
                            ‘Account Name does not match’);
    }
}
Code Coverage: 100%
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This Post Has One Comment

  1. Johny Bravo April 28, 2020 Reply

    Very nice work.

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