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%
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%  Copyright 1998-2021 Paulo Moura <pmoura@logtalk.org>
%  SPDX-License-Identifier: Apache-2.0
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%  you may not use this file except in compliance with the License.
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%      http://www.apache.org/licenses/LICENSE-2.0
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:- object(tests,
	extends(lgtunit)).

	:- info([
		version is 1:2:0,
		author is 'Paulo Moura',
		date is 2020-01-06,
		comment is 'Unit tests for the "delegates" example.'
	]).

	cover(delegator).
	cover(a_delegator).
	cover(a_delegator(_)).
	cover(a_delegate).
	cover(an_object).

	% without a delegate:
	test(delegates_1) :-
		a_delegator::operation(String),
		String == 'default implementation'.

	% with a delegate that does not implement thing/1:
	test(delegates_2) :-
		a_delegator::set_delegate(an_object),
		a_delegator::operation(String),
		String == 'default implementation'.

	% with a delegate that implements thing/1:
	test(delegates_3) :-
		a_delegator::set_delegate(a_delegate),
		a_delegator::operation(String),
		String == 'delegate implementation'.

	% same tests but using the parametric object implementation:
	test(delegates_4) :-
		a_delegator(an_object)::operation(String),
		String == 'default implementation'.

	test(delegates_5) :-
		a_delegator(a_delegate)::operation(String),
		String == 'delegate implementation'.

:- end_object.
