opencog-atomspace / tests / atoms / reduct / MinMaxUTest.cxxtest

/*
 * tests/atoms/MinMaxUTest.cxxtest
 *
 * Copyright (C) 2020 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/guile/SchemeEval.h>
#include <opencog/atomspace/AtomSpace.h>
#include <opencog/atoms/core/NumberNode.h>
#include <opencog/util/Logger.h>

using namespace opencog;

class MinMaxUTest: public CxxTest::TestSuite
{
private:
	AtomSpacePtr as;
	SchemeEval* eval;

public:
	MinMaxUTest(void)
	{
		logger().set_level(Logger::DEBUG);
		logger().set_print_to_stdout_flag(true);

		as = createAtomSpace();
		eval = SchemeEval::get_scheme_evaluator(as);
	}

	~MinMaxUTest()
	{
		// Erase the log file if no assertions failed.
		if (!CxxTest::TestTracker::tracker().suiteFailed())
			std::remove(logger().get_filename().c_str());
	}

	void setUp(void);
	void tearDown(void);

	void test_minmax(void);
	void test_infnan(void);
	void test_reduct(void);
};

void MinMaxUTest::tearDown(void)
{
	as->clear();
}

void MinMaxUTest::setUp(void)
{
	as->clear();
}

/*
 * Basic MinLink and MaxLink unit test.
 */
void MinMaxUTest::test_minmax(void)
{
	logger().debug("BEGIN TEST: %s", __FUNCTION__);

	// ---------
	Handle minim = eval->eval_h(
		"(cog-execute! (Min (Number 1 6 7) (Number 2 5 8) (Number 3 4 9)))"
	);
	printf("expecting minim: %s\n", minim->to_short_string().c_str());

	Handle eminim = eval->eval_h("(NumberNode 1 4 7)");
	TS_ASSERT_EQUALS(minim, eminim);

	// ---------
	Handle maxim = eval->eval_h(
		"(cog-execute! (Max (Number 1 6 7) (Number 2 5 8) (Number 3 4 9)))"
	);
	printf("expecting maxim: %s\n", maxim->to_short_string().c_str());

	Handle emaxim = eval->eval_h("(NumberNode 3 6 9)");
	TS_ASSERT_EQUALS(maxim, emaxim);

	// ---------
	logger().debug("END TEST: %s", __FUNCTION__);
}

/*
 * Behavior of inf and nan.
 */
void MinMaxUTest::test_infnan(void)
{
	logger().debug("BEGIN TEST: %s", __FUNCTION__);

	// ---------
	Handle inf = eval->eval_h(
		"(cog-execute! (Min (Number 1 2 3) (Number \"inf -inf inf\")))"
	);
	Handle einf = eval->eval_h("(Number \"1 -inf 3\")");
	printf("expect: %s\n", einf->to_short_string().c_str());
	printf("   got: %s\n",  inf->to_short_string().c_str());

	TS_ASSERT(*inf == *einf)
	TS_ASSERT_EQUALS(inf, einf)

	// ---------
	Handle xinf = eval->eval_h(
		"(cog-execute! (Max (Number 1 2 3) (Number \"inf -inf inf\")))"
	);

	Handle exinf = eval->eval_h("(Number \"inf 2 inf\")");
	printf("expect: %s\n", exinf->to_short_string().c_str());
	printf("   got: %s\n",  xinf->to_short_string().c_str());

	TS_ASSERT(*xinf == *exinf)
	TS_ASSERT_EQUALS(xinf, exinf)

	// ---------
	Handle nan = eval->eval_h(
		"(cog-execute! (Min (Number 1 2 3) (Number \"nan -inf inf\")))"
	);
	Handle enan = eval->eval_h("(Number \"1 -inf 3\")");

	printf("expect: %s\n", enan->to_short_string().c_str());
	printf("   got: %s\n",  nan->to_short_string().c_str());
	TS_ASSERT_EQUALS(nan, enan)

	// ---------
	Handle xnan = eval->eval_h(
		"(cog-execute! (Max (Number 1 2 3) (Number \"nan -inf inf\")))"
	);
	Handle exnan = eval->eval_h("(NumberNode \"1 2 inf\")");

	printf("expect: %s\n", exnan->to_short_string().c_str());
	printf("   got: %s\n",  xnan->to_short_string().c_str());
	TS_ASSERT_EQUALS(xnan, exnan)

	// ---------
	logger().debug("END TEST: %s", __FUNCTION__);
}

/*
 * Expressions with variables.
 */
void MinMaxUTest::test_reduct(void)
{
	logger().debug("BEGIN TEST: %s", __FUNCTION__);

	// ---------
	Handle mini = eval->eval_h(
		"(cog-execute! (Min (Number 1 6 7) (Number 2 5 8) (Variable \"$x\")))");
	printf("expecting mini: %s\n", mini->to_short_string().c_str());

	Handle emini = eval->eval_h(
		"(Min (Variable \"$x\") (Number 1 5 7))");

	TS_ASSERT_EQUALS(mini, emini)

	// ---------
	Handle maxi = eval->eval_h(
		"(cog-execute! (Max (Number 1 6 7) (Number 2 5 8) (Variable \"$x\")))");
	printf("expecting maxi: %s\n", maxi->to_short_string().c_str());

	Handle emaxi = eval->eval_h(
		"(Max (Variable \"$x\") (Number 2 6 8))");

	TS_ASSERT_EQUALS(maxi, emaxi)

	// ---------
	logger().debug("END TEST: %s", __FUNCTION__);
}