Apex Testing

Summary

This post will cover topics below:

Test Class
Test method
Test Data Factory

Introduction

Apex testing is crucial and mandatory to have in order to deploy Apex in the Production environment. An overall score of apex testing is 75%, however, as best practices, aims to have a higher score such as 100%.

Test class

Syntax:


@isTest
public class apexTestClass {
//contents
}

NOTE

Class can be defined Public or Private.

Public generally for Test Data Factory

Test Method

Syntax:


@isTest
static void method_name() {
    //content
}

NOTE

No Parameter

Define method as a static void

Example:


@isTest private class TestAcctDeletion {
    @isTest static void testDeleteAccount() {
        Account acct = new Account(Name='Test Acct');
        insert acct;
        
        Test.startTest();
        Database.deleteResult res = Database.deleteResult(acct, false);
        Test.stopTest();
        
        System.assert(res.isSuccess());
        System.assertEquals(true, res.isSuccess());
    }
}

NOTE:

System.assert - Check a condition of value TRUE and FALSE.

System.assertEquals - Test a value if the same or not.

Test Data Factory

A class to generate data in the Apex Test.

Syntax:


@isTest public class TestDataFactory {
    public static createData() {
        //contents
    }
}

Example:


@isTest public class TestDataFactory {
    public static List createAccWithOpps(Integer numAccts, Integer numOpp) {
        List<Account> accts = new List<Account>();
        for(Integer i = 0; i < numAccts; i++) {
            Account a = new Account(Name='Test acct ' +i);
            accts.add(a);
        }
        insert accts;
        List<Opportunity> oppts = new List<Opportunity>();
        for(Integer i = 0; i < numAccts; i++) {
            Account acct = accts[i];
            for(Integer y = 0; y < numOpp; i++) {
                oppts.add(new Opportunity(Name=acct.Name+ 'Opp ' +y, StageName='Prospecting', AccountId=acct.Id));
            }
        }
        insert opps;
        return accts;
    }
}

Usage:


@isTest private class TestAcct {
    @isTest static void TestAcctWithOpp() {
        //create acct with TestDataFactory
        List<Account> accts = TestDataFactory.createAccWithOpps(1, 1);
    }
}