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YY_PAO_MONEY_CHAPTER11.abap
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*&---------------------------------------------------------------------*
*& The Money Example for Test-Driven Development in ABAP
*& based on TDD by Example: Part 1; Chapter 11
*&---------------------------------------------------------------------*
PROGRAM yy_pao_money_chapter11.
"" $5 + 10 CHF = $10 if rate is 2:1
"" Money rounding?
"" Equal null
"" Equal object
** Dollar/Franc duplication
"" Delete franc_multiplication FOR TESTING?
*& Production Code
CLASS lcl_money DEFINITION.
PUBLIC SECTION.
CLASS-METHODS:
dollar
IMPORTING iv_amount TYPE i
RETURNING VALUE(ro_dollar) TYPE REF TO lcl_money,
franc
IMPORTING iv_amount TYPE i
RETURNING VALUE(ro_franc) TYPE REF TO lcl_money.
METHODS:
constructor
IMPORTING iv_amount TYPE i
iv_currency TYPE currency,
times
IMPORTING iv_multiple TYPE i
RETURNING VALUE(ro_product) TYPE REF TO lcl_money,
equals
IMPORTING iv_data_object TYPE data
RETURNING VALUE(rv_result) TYPE abap_bool,
amount
RETURNING VALUE(rv_amount) TYPE i,
currency
RETURNING VALUE(rv_currency) TYPE currency.
PRIVATE SECTION.
DATA:
mv_amount TYPE i,
mv_currency TYPE currency.
ENDCLASS.
CLASS lcl_money IMPLEMENTATION.
METHOD dollar.
ro_dollar = NEW lcl_money( iv_amount = iv_amount
iv_currency = |USD| ).
ENDMETHOD.
METHOD franc.
ro_franc = NEW lcl_money( iv_amount = iv_amount
iv_currency = |CHF| ).
ENDMETHOD.
METHOD constructor.
mv_amount = iv_amount.
mv_currency = iv_currency.
ENDMETHOD.
METHOD times.
ro_product = NEW lcl_money( iv_amount = amount( ) * iv_multiple
iv_currency = currency( ) ).
ENDMETHOD.
METHOD equals.
DATA(lo_money) = CAST lcl_money( iv_data_object ).
rv_result = xsdbool( amount( ) = lo_money->amount( ) AND
currency( ) = lo_money->currency( ) ).
ENDMETHOD.
METHOD amount.
rv_amount = mv_amount.
ENDMETHOD.
METHOD currency.
rv_currency = mv_currency.
ENDMETHOD.
ENDCLASS.
*& Test Code
CLASS ltc_example DEFINITION
INHERITING FROM cl_aunit_assert
FOR TESTING RISK LEVEL HARMLESS.
PRIVATE SECTION.
METHODS:
multiplication FOR TESTING,
equality FOR TESTING,
currency FOR TESTING.
ENDCLASS.
CLASS ltc_example IMPLEMENTATION.
METHOD multiplication.
DATA(lo_five) = lcl_money=>dollar( 5 ).
assert_equals( exp = abap_true
act = lo_five->times( 2 )->equals( lcl_money=>dollar( 10 ) ) ).
assert_equals( exp = abap_true
act = lo_five->times( 3 )->equals( lcl_money=>dollar( 15 ) ) ).
ENDMETHOD.
METHOD equality.
assert_equals( exp = abap_true
act = lcl_money=>dollar( 5 )->equals( lcl_money=>dollar( 5 ) ) ).
assert_equals( exp = abap_false
act = lcl_money=>dollar( 5 )->equals( lcl_money=>dollar( 6 ) ) ).
assert_equals( exp = abap_false
act = lcl_money=>franc( 5 )->equals( lcl_money=>dollar( 5 ) ) ).
ENDMETHOD.
METHOD currency.
assert_equals( exp = |USD|
act = lcl_money=>dollar( 1 )->currency( ) ).
assert_equals( exp = |CHF|
act = lcl_money=>franc( 1 )->currency( ) ).
ENDMETHOD.
ENDCLASS.