Hi Everyone ,
         I have an apex class whose constructor is calling a method . The call out is done after setting 1 parameter . The code is given below:

Constructor:

  public ProposalSearchControllerModified() {
     //String variable for soql
      soql = 'Select Id,Name from Opportunity where name != null';
     //executing SOQL AND PAASING VALUES TO THE LIST.
     Opportunities = Database.query(soql + ' order by ' + sortField + ' ' + sortDir+ ' Limit 50');
     //USING 1ST RECORD OF LIST TO EXECUTE ANOTHE METHOD - CLEAR Order
     DetailRecordId=Opportunities[0].Id;    
    ClearOrder();
  }


Test Class Code:

@istest
public class ProposalSearchControllerModifiedTest{
    public static testmethod void ProposalSearchMethod(){
         
         
         PageReference pageRef = Page.ProposalSearchModified;
         pageRef.getParameters().put('Name', 'Te');
         pageRef.getParameters().put('OpportunityID', '0');
         pageRef.getParameters().put('SolicitationNo', '0');
         pageRef.getParameters().put('ProposalNo', '0');
         
         Test.setCurrentPage(pageRef);
         ProposalSearchControllerModified cs=new ProposalSearchControllerModified();
         String sd=cs.sortDir;
         String sf=cs.sortField;
         String ds=cs.debugSoql;
         list<String> ls=cs.Stages;
         list<String> ls1=cs.SubStages;
         list<String> ls2=cs.FiscalYearValues;
         
         cs.toggleSort();
         cs.runQuery();
         cs.runSearch();
         cs.reset();
         
         
    
    }
}​



Error Message:

System.ListException: List index out of bounds: 0

Error is thrown when highlighted line in code above is covered through test class.