I Get te following error on my testclass: Method does not exist or incorrect signature: void isEmpty(). There are several answers to this but I still dont understand what is wrong with my testclass.


public class CreateFactuurregel {
    public void CreateFactuurregel(){
        List<Account> acc= [SELECT Name,Debiteurenrnummer__c FROM Account WHERE Bestuurdersaansprakelijkheidsverzekering__c = true AND RecordTypeId ='0125800000010Rk'];
        for(integer x=0;x<acc.size();x++){
            Factuurregel__c fact =new Factuurregel__c(Organisatie__c=acc[x].Name, Debiteur__c = acc[x].Debiteurenrnummer__c ,
                                                      Aantal__c = 1, Product__c= 'Bestuurdersaansprakelijkheidsverzekering', Factuurdatum__c= date.today()
            insert fact;


public class CreateFactuurregelTest {
    static testMethod void createFactuurregelstest() {
    Account acct = new Account(Name = 'testname', recordtypeId='0125800000010Rk',Bestuurdersaansprakelijkheidsverzekering__c=true);
    insert acct;

        CreateFactuurregel fr = new CreateFactuurregel();

  • 2
    Well, if you don't define that method on your class CreateFactuurregel, it will not exist. – Florian Heer Nov 29 '17 at 17:04
  • 1
    Hi Thomas, welcome to SFSE. Please take a moment to scroll through the tour, read How to Ask, and visit the help center. If you explain what you are trying to achieve, you are more likely to get a useful answer. – Adrian Larson Nov 29 '17 at 17:17

I'll offer a couple notes here that you may find useful.

  • Never hard-code Ids.

    Salesforce itself indicates it as a best practice to avoid such hard-coding, and it completely breaks your flexibility to migrate between orgs (except from full-copy sandbox environments to production).

    You can modify your query to filter on RecordType.DeveloperName:

    ... AND RecordType.DeveloperName = 'My_Record_Type'

    You can modify your test class to query for that RecordType and set its Id:

    RecordType myRecordType = [
        SELECT Id FROM RecordType
        WHERE SObjectType = 'Account'
        AND DeveloperName = 'My_Record_Type'
    insert new Account(/*other fields*/, RecordTypeId=myRecordType.Id);
  • Add informative assertion messages. They make your tests way easier to maintain and understand.

  • If you want to store some data outside the context of a method, you can do so by adding a property.

    For example, that might look like:

    public class MyClass
        public List<Account> myAccounts;
        public MyClass()
        { // constructor block
            myAccounts = [/*some query*/]
        public void myMethod()
            // use myAccounts data here

    Now in your test, you can check if the proper records get queried:

    static testmethod void myTest()
        // set up data
            MyClass instance = new MyClass();
        system.assertNotEquals(null, instance.myAccounts, 'The collection should be initialized');
        system.assert(!instance.myAccounts.isEmpty(), 'The proper records should be queried');

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