I've been trying to run my test class via Visual Studio Code, but I get the following error message:

INVALID_FIELD_FOR_INSERT_UPDATE, cannot specify Id in an insert call: [Id]

Deployment to org is successful though, but it keeps displaying such message when I run it.

As for the controller, it just inserts a new custom object record.

Meanwhile, following are both controller, TestDataFactory, test class I've been working on:


public with sharing class CustObj1Controller {
    public static CustObj1__c createCustomObj1(CustObj1__c newCustObj1){
        insert newCustObj1;
        return newCustObj1;    


public with sharing class TestDataFactory {
    public static List<CustObj1__c> createCustObj1(Integer count, Boolean performDML) {
        List<CustObj1__c> custObj1List = new List<CustObj1__c>();
        for(Integer i=0; i < count; i++) {
            CustObj1__c custObj1 = new CustObj1__c();
            custObj1.Field1__c = 'this is a sample field value' + i;
        if(performDML) {
            insert custObj1List;
        return custObj1List;


private class CustObj1ControllerTest {
    static void testSetup(){
        List<CustObj1__c> custObj1List = TestDataFactory.createCustObj1(1, false);    
        CustObj2__c custObj2 = new CustObj2__c();
        custObj2.CustObj1__c = custObj1List[0].Id;
        custObj2.Field1__c = 'Field1';
        custObj2.Field2__c = 'Field2'; 
        insert custObj2; 
    @isTest static void testCustObj1() {
        List<CustObj2__c> custObj2List  =  [SELECT CustObj1__c FROM CustObj2__c];

Hoping someone could help me on this.


The records are already inserted (the true parameter causes the method to insert the records). Either use false, so you can add additional fields before inserting, or use the update method to update the records.

  • I've tried modifying following line to false, but same error occurs System.assertEquals(false,fsCalcToolList.size()>0);.
    – Ertyq
    Oct 7 '20 at 12:38
  • @Ertyq List<CustObj1__c> custObj1List = TestDataFactory.createCustObj1(1, false);
    – sfdcfox
    Oct 7 '20 at 12:54
  • I updated it based on your suggestion, but another problem occurs. It says that REQUIRED_FIELD CustObj1__c is missing. Is there anything I should add?
    – Ertyq
    Oct 7 '20 at 14:11
  • @Ertyq Whatever field it is that you have is missing a value. You need to make sure the value is present and not null.
    – sfdcfox
    Oct 7 '20 at 14:14
  • CustObj1__c master-detail field is already added when inserting CustObj2__c record. It's on the CustObj1ControllerTest : custObj2.CustObj1__c = custObj1List[0].Id;
    – Ertyq
    Oct 7 '20 at 14:22

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