! Copyright (C) 2011 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: classes.maybe eval generic.single kernel tools.test
math classes accessors slots classes.algebra ;
IN: classes.maybe.tests

[ t ] [ 3 maybe: integer instance? ] unit-test
[ t ] [ f maybe: integer instance? ] unit-test
[ f ] [ 3.0 maybe: integer instance? ] unit-test

TUPLE: maybe-integer-container { something maybe: integer } ;

[ f ] [ maybe-integer-container new something>> ] unit-test
[ 3 ] [ maybe-integer-container new 3 >>something something>> ] unit-test
[ maybe-integer-container new 3.0 >>something ] [ bad-slot-value? ] must-fail-with

TUPLE: self-pointer { next maybe: self-pointer } ;

[ T{ self-pointer { next T{ self-pointer } } } ]
[ self-pointer new self-pointer new >>next ] unit-test

[ t ] [ f maybe: f instance? ] unit-test

PREDICATE: natural < maybe: integer
    0 > ;

[ f ] [ -1 natural? ] unit-test
[ f ] [ 0 natural? ] unit-test
[ t ] [ 1 natural? ] unit-test

[ t ] [ f maybe: maybe: integer instance? ] unit-test
[ t ] [ 3 maybe: maybe: integer instance? ] unit-test
[ f ] [ 3.03 maybe: maybe: integer instance? ] unit-test

INTERSECTION: only-f maybe: integer POSTPONE: f ;

[ t ] [ f only-f instance? ] unit-test
[ f ] [ t only-f instance? ] unit-test
[ f ] [ 30 only-f instance? ] unit-test

UNION: ?integer-float maybe: integer maybe: float ;

[ t ] [ 30 ?integer-float instance? ] unit-test
[ t ] [ 30.0 ?integer-float instance? ] unit-test
[ t ] [ f ?integer-float instance? ] unit-test
[ f ] [ t ?integer-float instance? ] unit-test

TUPLE: foo ;
GENERIC: lol ( obj -- string )
M: maybe: foo lol drop "lol" ;

[ "lol" ] [ foo new lol ] unit-test
[ "lol" ] [ f lol ] unit-test
[ 3 lol ] [ no-method? ] must-fail-with

TUPLE: foo2 a ;
GENERIC: lol2 ( obj -- string )
M: maybe: foo lol2 drop "lol2" ;
M: f lol2 drop "lol22" ;

[ "lol2" ] [ foo new lol2 ] unit-test
[ "lol22" ] [ f lol2 ] unit-test
[ 3 lol2 ] [ no-method? ] must-fail-with

[ t ] [ \ + <maybe> classoid? ] unit-test
[ f ] [ \ + <maybe> valid-classoid? ] unit-test