opencog-atomspace / tests / atoms / core / DeleteLinkUTest.cxxtest

/*
 * tests/atoms/core/DeleteUTest.cxxtest
 *
 * Copyright (C) 2015 Linas Vepstas
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License v3 as
 * published by the Free Software Foundation and including the exceptions
 * at http://opencog.org/wiki/Licenses
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, write to:
 * Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <opencog/atoms/base/Atom.h>
#include <opencog/atomspace/AtomSpace.h>
#include <opencog/atoms/constrain/DeleteLink.h>

using namespace opencog;

// Test the DeleteLink.
//
class DeleteLinkUTest :  public CxxTest::TestSuite
{
private:
	AtomSpace _as;

public:
	DeleteLinkUTest()
	{
		logger().set_print_to_stdout_flag(true);
	}

	void setUp() {}

	void tearDown() {}

	void test_free_delete();
};

#define N _as.add_node
#define L _as.add_link

// Test to make sure that DeleteLink is a FreeLink, i.e. does not
// bind any of its variables. See bug #333 for the original report.
void DeleteLinkUTest::test_free_delete()
{
	logger().info("BEGIN TEST: %s", __FUNCTION__);

	// Copied from examples/guile/get-put.scm
	Handle pred, list;
	Handle add =
		L(PUT_LINK,
			L(EDGE_LINK,
				pred = N(PREDICATE_NODE, "some property"),
				N(VARIABLE_NODE, "$x")),
			list = L(LIST_LINK,
				N(CONCEPT_NODE, "thing A"),
				N(CONCEPT_NODE, "B-dom-ness")));

	// The incoming set should be simple.
	TS_ASSERT_EQUALS(1, pred->getIncomingSetSize());
	TS_ASSERT_EQUALS(1, list->getIncomingSetSize());

	// Test that execution creates the desired link...
	Handle prop = _as.add_atom(HandleCast(add->execute(&_as)));

	printf("Created link %s\n", prop->to_string().c_str());
	TS_ASSERT_EQUALS(EDGE_LINK, prop->get_type());
	TS_ASSERT_EQUALS(pred, prop->getOutgoingAtom(0));
	TS_ASSERT_EQUALS(list, prop->getOutgoingAtom(1));

	// The incoming set should increase by one.
	TS_ASSERT_EQUALS(2, pred->getIncomingSetSize());
	TS_ASSERT_EQUALS(2, list->getIncomingSetSize());

	// ----------------------------------------------
	// Now, delete the thing.
	Handle del =
		L(PUT_LINK,
			L(DELETE_LINK,
				L(EDGE_LINK,
					N(PREDICATE_NODE, "some property"),
					N(VARIABLE_NODE, "$x"))),
			L(LIST_LINK,
				N(CONCEPT_NODE, "thing A"),
				N(CONCEPT_NODE, "B-dom-ness")));

	// The incoming set of the ListLink (only) should increase by one.
	TS_ASSERT_EQUALS(2, pred->getIncomingSetSize());
	TS_ASSERT_EQUALS(3, list->getIncomingSetSize());

	Handle undef = HandleCast(del->execute(&_as));
	TS_ASSERT_EQUALS(undef, Handle::UNDEFINED);

	// The incoming set of both should decrease by one.
	TS_ASSERT_EQUALS(1, pred->getIncomingSetSize());
	TS_ASSERT_EQUALS(2, list->getIncomingSetSize());

	logger().info("END TEST: %s", __FUNCTION__);
}