Test Class Code Coverage Issue : System.QueryException

Question

My Apex class is

Class1:

Public class myclass{
    //some code
    public void save(){
        invoice_policy__c inp=[select net__c,Internal_alerts__c,Send_Email__c,Email_Alerts__c,Send_To__c from invoice_policy__c where id=:selectin]; //getting error here
        if(inp.Internal_alerts__c == true){
             //some code
        }
    }
    string Selectin;
    Public string getSelectin(){return Selectin;}
    public void setSelectin(string selectin){this.selectin = Selectin;}

    public list<selectoption> getselectname(){
        list<selectoption> option = new list<selectoption>();  

        for(Invoice_Policy__c invoice : [select id,name,Policy_Status__c from Invoice_Policy__c where Policy_Status__c='Active'] ){       

            option.add(new selectoption(invoice.Id,invoice.name));
            system.debug('invocenameee'+invoice.Id);  
        }
        return option;     
    } 
}

My test class is

invoice_policy__c ip = new invoice_policy__c(name='TestPolicy',net__c='3',Policy_Status__c='Active',send_to__c='[email protected]',Email_Alerts__c='Before',Internal_Alerts__c =true);
ip.send_email__c='2';
insert ip;
system.debug('testttt'+ip);

myclass ic = new myclass();
ic.getselectin();
ic.setselectin('a0Wi0000000NMqbEAG');
ic.save();

Getting error as System.QueryException List has no rows for assignment to SObject Help on this please.

Answer 1

As crop1645 in the comments pointed out, you're hard-coding an Id into your test that does not represent the object you just inserted.

In general though,

System.QueryException List has no rows for assignment to SObject

can be avoided by selecting to a list and then doing a check as to whether the list contains any objects. You can use that to either gracefully handle this condition or to surface a custom, and perhaps more descriptive exception to be handled elsewhere.