anchor.diff:  *----------------------------------------------------------------------*
   *
   *----------------------------------------------------------------------*
  -CLASS lcl_abap_unit DEFINITION FOR TESTING risk level harmless duration short FINAL.
  +CLASS lcl_abap_unit DEFINITION FOR TESTING RISK LEVEL HARMLESS DURATION SHORT FINAL.
   
     PRIVATE SECTION.
   
  
positive.code:           lo_data_descr  TYPE REF TO cl_abap_datadescr,
            lo_table_descr TYPE REF TO cl_abap_tabledescr.
  
      FIELD-SYMBOLS: <lg_line> TYPE ANY.
  
  
      lo_table_descr ?= cl_abap_typedescr=>describe_by_data( it_table ).
  
negative.code:     lv_data = iv_data.
  
  * header
      IF NOT xstrlen( lv_data ) > 4 OR lv_data(4) <> c_pack_start.
        _raise 'Unexpected pack header'.
      ENDIF.
      lv_data = lv_data+4.
  