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trigger CompetitorContactTrigger on Contact (before insert, before update) {    
    
    //Get a list of all our Competitors' names from our Custom Metadata
    //Create an empty List of Strings to hold your Competitors' names
    for(){//Query your Custom Metadata and get its Label field
        //Add the Label to your List of Strings
    }
    
    //Create a Map of IDs to Accounts; populate your map on the same line by putting a query in the parentheses.
    //Your query will just get Account IDs from Account where the Name is in your List of Strings

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trigger LeadTrigger on Lead (After Update) {
    Map<Id, Lead> leadsToUpdate = new Map<Id, Lead>();
    
    List<Competitor__mdt> competitorRecords = [Select Label from Competitor__mdt];//Retrieve our Custom Metadata Records
    List<String> competitorNames = new List<String>();//Instantiate an empty list to hold the names of our competitors
    for(Competitor__mdt record : competitorRecords){//Loop through the Custom Metadata records our query returned
        competitorNames.add(record.Label);//Add them to our empty list
    }
    
    for(Integer i = 0 ; i < trigger.new.size() ; i++){

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@isTest
public class LeadTriggerTest {
    
    public static testMethod void testOneClosedNotConverted(){
        Lead l = new Lead();
        l.LastName = 'Lead Last Name';
        l.Company = 'Lead Company';
        insert l;
        
        test.startTest();

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/* A simple batch Apex class to demonstrate updating a field on Opportunity
 * Can be executed from Anonymous Apex using 2 lines:
 * OpportunityBatch oppBatch = new OpportunityBatch();
 * database.executeBatch(oppBatch);
 */
global class OpportunityBatch implements Database.Batchable<sObject> {
    global Database.QueryLocator start(Database.BatchableContext BC) {
        String query = 'SELECT Id,Name FROM Opportunity';
        return Database.getQueryLocator(query);
    }

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trigger AccountTrigger on Account (after update) {
    //prepare an empty Map of ID-to-Account for your updates
    Map<ID, Account> acctMapToUpdate = new Map<Id, Account>();
    
    //prepare a for-loop you can use to compare old and new field values 
    for(Integer i = 0 ; i < trigger.new.size() ; i++){
        Account old = trigger.old[i];
        Account nw = trigger.new[i];
        
        //Evaluate Custom Settings to decide whether to execute actions 

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public class LogUtility {
    public static void messageLog(String classMethod, String customMessage, Set<Id> recordIds) {
        Case logEntry = new Case(
            Type = 'Message',
            Subject = customMessage,
            Description = 'Record IDs: ' + recordIds + '\n'
            + customMessage);
        insertLog(logEntry, classMethod);
    }
    

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/* BatchRecordUpdate will update any 1 field on any 1 object.
 * 
 * String values must be set to Object, Field and Value to be added to Field.
 * 
 * Query can be modified to limit records updated.
 * Example below excludes records for which Degree Offering already equals the new value.
 * 
 * All 4 strings' values must be set to operate when executed.
 * 
 * Execute in Anonymous Apex.

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public class ContactAfterInsert {
    public static void setContactDeptIT(List<Contact> cons){
        List<Contact> consToUpdate = new List<Contact>();
        
        for(Contact conInTrigger : cons){
            Contact c = new Contact(Id = conInTrigger.Id, Department = 'IT');
            consToUpdate.add(c);
        }
        
        update consToUpdate;

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public class ContactBeforeInsert {
    public static void setContactTitle(List<Contact> cons){
        for(Contact c : cons){
            c.Title = 'Admin';
        }        
    }
    
}

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Trigger ContactBeforeTrigger on Contact (before insert) {
    for(Contact c : Trigger.new){
        c.Title = 'Admin';
    }
}