/*  Part of SWI-Prolog

    Author:        Jan Wielemaker
    E-mail:        J.Wielemaker@vu.nl
    WWW:           http://www.swi-prolog.org
    Copyright (c)  2021, SWI-Prolog Solutions b.v.
    All rights reserved.

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       notice, this list of conditions and the following disclaimer.

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       distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/

:- module(test_when,
          [ test_when/0
          ]).
:- use_module(library(plunit)).
:- use_module(library(when)).

test_when :-
    run_tests([ when
              ]).

:- begin_tests(when).

% From PR832 by @dgelessus

test(nested_ground, Frozen =@= Constraint) :-
    Constraint = when(ground(A) ; ((ground(B), ground(C))),
                      plunit_when:whened(Whened)),
    call(Constraint),
    Term = A+B+C+Whened,
    copy_term(Term, Term, [Frozen]).
test(nested_ground, Frozen =@= Constraint) :-
    Constraint = when(ground(A) ; ((ground(B), ground(C)), ground(D)),
                      plunit_when:whened(Whened)),
    call(Constraint),
    Term = A+B+C+D+Whened,
    copy_term(Term, Term, [Frozen]).
test(nested_ground, Frozen =@= Constraint) :-
    Constraint = when(ground(A) ; (((ground(B),ground(C)),ground(D)), ground(E)),
                      plunit_when:whened(Whened)),
    call(Constraint),
    Term = A+B+C+D+E+Whened,
    copy_term(Term, Term, [Frozen]).

whened(true).

:- end_tests(when).
