Use the testsetup anotation method that will run firstly in test class and applied to each testmethod/@isTest anotation method
 

@testSetup static void setup() {
        // Create common test accounts
         List<Account> testAccts = new List<Account>();
        for(Integer i=0;i<2;i++) {
            testAccts.add(new Account(Name = 'TestAcct'+i));
        }
        insert testAccts;
        List<Address_By_BP__c> testAddress = new List<Address_By_BP__c>();
        for(Accounts a:testAccts) {
        
            testAddress.add(Account__c=a.id,Address_Code__c='23');
        }
        insert testAddress;
         List<Case> testCase = new List<Case>();
        for(Accounts a:testAccts) {
            testCase.add(new Case(Subject=a.Id+ 'sa',AccountId=a.Id));
        }
        insert testCase;
        List<ServiceForm__c> testServForm = new List<ServiceForm__c>();
        for(Case c:testCase) {
        
            testServForm.add(Name='Test Ser',Case__c=c.id);
        }
        insert testServForm;
    }
 
    @isTest static void testMethod1() {
    
    List<ServiceForm__c> ServFormLs=[Select Id from ServiceForm__c Where Name='Test Ser'];
    
    List<Address_By_BP__c> AddressBPLs=[Select Id from Address_By_BP__c Where Address_Code__c='23'];
    
    //Add your snap code for further condition
    //User either System.assert() or System.assertEquals()
    //User Test.startTest() and Test.stopTest() for performing unit test.
   }

Please refer below link
https://www.sfdcpoint.com/salesforce/testsetup-method-in-apex-test-classes/
https://amitsalesforce.blogspot.com/2015/02/starttest-and-stoptest-method.html

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