Salesforce trailhead - Apex-Integration-Services-Apex-Web-Services

AccountManager.cls

@RestResource(urlMapping='/Accounts/*/contacts')
global with sharing class AccountManager {
    
   
    @HttpGet
    global static account getAccount() {
                
        RestRequest request = RestContext.request;
        
        String accountId = request.requestURI.substring(request.requestURI.lastIndexOf('/')-18,
          request.requestURI.lastIndexOf('/'));
        List<Account> a = [select id, name, (select id, name from contacts) from account where id = :accountId];
        List<contact> co = [select id, name from contact where account.id = :accountId];
        system.debug('** a[0]= '+ a[0]);
        return a[0];

    }

}

AccountManagerTest.cls

@Istest(SeeAllData=true)
public class AccountManagerTest {
    

    
    @IsTest
    public static void testaccountmanager() {
        RestRequest request = new RestRequest();
        request.requestUri = 'https://mannharleen-dev-ed.my.salesforce.com/services/apexrest/Accounts/00190000016cw4tAAA/contacts';
        request.httpMethod = 'GET';
        RestContext.request = request;
        
		system.debug('test account result = '+ AccountManager.getAccount());


        
    }
    

}

Thanks