Debug an Oracle Function

I need to analyze the following function.

    RETURN VARCHAR IS swbs VARCHAR(4000);
      
        swbsCount number;
        swbsHolder VARCHAR(4000);
        counter int;

        BEGIN

            swbs := '';
            swbsHolder := '';
            counter := 1;

            Declare
                CURSOR CUR_CURSOR  is
                    select rownum as numb,
                       COALESCE(swbs,'-'),' '
                      as swbs_info
                        from t_psa_swbs a
                                    where PSA_MASTER_SEQNUM = 3;

            Begin

Cursor rows returned:
numb (rownum)      swbs_info
1                  0004
2                  0003
3                  0001
4                  0002


FOR cur_rec IN CUR_CURSOR  --
                LOOP
                    select cur_rec.swbs_info into swbsHolder from dual;
                    swbs := swbs || swbsHolder ||'   ' ;
                end loop;
            End;

        return swbs;

This looks like it would return the string "0004 0003 0001 0002 " 

How can I test the function?

How can I debug the function and watch each step ?
Thanks,
DovbermanAsked:
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slightwv (䄆 Netminder) Commented:
To 'test' it:
select function_name from dual;

For 'debugging' it, you'll need a tool that has a pl/sql debugger built into it.

Take a look at Oracle's SQL Developer:
http://www.oracle.com/webfolder/technetwork/tutorials/obe/db/11g/r2/prod/appdev/sqldev/plsql_debug/plsql_debug_otn.htm

That said, there are MUCH better ways of string concatenation that what you have posted.

In 11g and above check out LISTAGG.  It is a built-in function that does this:
http://docs.oracle.com/cd/E11882_01/server.112/e41084/functions089.htm#SQLRF30030
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DovbermanAuthor Commented:
Excellent. Thanks
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