Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle 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 General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

namespace core;

use calc_formula;

defined('MOODLE_INTERNAL') || die();

global $CFG;

require_once($CFG->libdir . '/mathslib.php');

/**

 * Unit tests of mathslib wrapper and underlying EvalMath library.

 *

 * @package    core

 * @category   phpunit

 * @copyright  2007 Petr Skoda {@link http://skodak.org}

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class mathslib_test extends \basic_testcase {

    /**

     * Tests the basic formula evaluation.

     */

    public function test__basic(): void {

        $formula = new calc_formula('=1+2');

        $res = $formula->evaluate();

        $this->assertSame($res, 3, '3+1 is: %s');

    }

    /**

     * Tests the formula params.

     */

    public function test__params(): void {

        $formula = new calc_formula('=a+b+c', array('a'=>10, 'b'=>20, 'c'=>30));

        $res = $formula->evaluate();

        $this->assertSame(60, $res, '10+20+30 is: %s');

    }

    /**

     * Tests the changed params.

     */

    public function test__changing_params(): void {

        $formula = new calc_formula('=a+b+c', array('a'=>10, 'b'=>20, 'c'=>30));

        $res = $formula->evaluate();

        $this->assertSame(60, $res, '10+20+30 is: %s');

        $formula->set_params(array('a'=>1, 'b'=>2, 'c'=>3));

        $res = $formula->evaluate();

        $this->assertSame(6, $res, 'changed params 1+2+3 is: %s');

    }

    /**

     * Tests the spreadsheet emulation function in formula.

     */

    public function test__calc_function(): void {

        $formula = new calc_formula('=sum(a, b, c)', array('a'=>10, 'b'=>20, 'c'=>30));

        $res = $formula->evaluate();

        $this->assertSame(60, $res, 'sum(a, b, c) is: %s');

    }

    public function test_other_functions(): void {

        $formula = new calc_formula('=average(1,2,3)');

        $this->assertSame(2, $formula->evaluate());

        $formula = new calc_formula('=mod(10,3)');

        $this->assertSame(1, $formula->evaluate());

        $formula = new calc_formula('=power(2,3)');

        $this->assertSame(8, $formula->evaluate());

    }

    public function test_conditional_functions(): void {

        // Test ifthenelse.

        $formula = new calc_formula('=ifthenelse(1,2,3)');

        $this->assertSame(2, (int)$formula->evaluate());

        $formula = new calc_formula('=ifthenelse(0,2,3)');

        $this->assertSame(3, (int) $formula->evaluate());

        $formula = new calc_formula('=ifthenelse(2<3,2,3)');

        $this->assertSame(2, (int) $formula->evaluate());

        // Test synonym if.

        $formula = new calc_formula('=if(1,2,3)');

        $this->assertSame(2, (int)$formula->evaluate());

        $formula = new calc_formula('=if(0,2,3)');

        $this->assertSame(3, (int) $formula->evaluate());

        $formula = new calc_formula('=if(2<3,2,3)');

        $this->assertSame(2, (int) $formula->evaluate());

        // Test cond_and.

        $formula = new calc_formula('=cond_and(1,1,1)');

        $this->assertSame(1, (int)$formula->evaluate());

        $formula = new calc_formula('=cond_and(1,1,0)');

        $this->assertSame(0, (int) $formula->evaluate());

        $formula = new calc_formula('=cond_and(0,0,0)');

        $this->assertSame(0, (int) $formula->evaluate());

        // Test synonym and.

        $formula = new calc_formula('=and(1,1,1)');

        $this->assertSame(1, (int)$formula->evaluate());

        $formula = new calc_formula('=and(1,1,0)');

        $this->assertSame(0, (int) $formula->evaluate());

        $formula = new calc_formula('=and(0,0,0)');

        $this->assertSame(0, (int) $formula->evaluate());

        // Test cond_or.

        $formula = new calc_formula('=cond_or(1,1,1)');

        $this->assertSame(1, (int)$formula->evaluate());

        $formula = new calc_formula('=cond_or(1,1,0)');

        $this->assertSame(1, (int) $formula->evaluate());

        $formula = new calc_formula('=cond_or(0,0,0)');

        $this->assertSame(0, (int) $formula->evaluate());

        // Test synonym or.

        $formula = new calc_formula('=or(1,1,1)');

        $this->assertSame(1, (int)$formula->evaluate());

        $formula = new calc_formula('=or(1,1,0)');

        $this->assertSame(1, (int) $formula->evaluate());

        $formula = new calc_formula('=or(0,0,0)');

        $this->assertSame(0, (int) $formula->evaluate());

    }

    public function test_conditional_operators(): void {

        $formula = new calc_formula('=2==2');

        $this->assertSame(1, $formula->evaluate());

        $formula = new calc_formula('=2>3');

        $this->assertSame(0, $formula->evaluate());

        $formula = new calc_formula('=2<3');

        $this->assertSame(1, $formula->evaluate());

        $formula = new calc_formula('=(2<=3)');

        $this->assertSame(1, $formula->evaluate());

        $formula = new calc_formula('=(2<=3)*10');

        $this->assertSame(10, $formula->evaluate());

        $formula = new calc_formula('=(2>=3)*10');

        $this->assertSame(0, $formula->evaluate());

        $formula = new calc_formula('=2<3*10');

        $this->assertSame(10, $formula->evaluate());

    }

    /**

     * Tests the min and max functions.

     */

    public function test__minmax_function(): void {

        $formula = new calc_formula('=min(a, b, c)', array('a'=>10, 'b'=>20, 'c'=>30));

        $res = $formula->evaluate();

        $this->assertSame(10, $res, 'minimum is: %s');

        $formula = new calc_formula('=max(a, b, c)', array('a'=>10, 'b'=>20, 'c'=>30));

        $res = $formula->evaluate();

        $this->assertSame(30, $res, 'maximum is: %s');

    }

    /**

     * Tests special chars.

     */

    public function test__specialchars(): void {

        $formula = new calc_formula('=gi1 + gi2 + gi11', array('gi1'=>10, 'gi2'=>20, 'gi11'=>30));

        $res = $formula->evaluate();

        $this->assertSame(60, $res, 'sum is: %s');

    }

    /**

     * Tests some slightly more complex expressions.

     */

    public function test__more_complex_expressions(): void {

        $formula = new calc_formula('=pi() + a', array('a'=>10));

        $res = $formula->evaluate();

        $this->assertSame(pi()+10, $res);

        $formula = new calc_formula('=pi()^a', array('a'=>10));

        $res = $formula->evaluate();

        $this->assertSame(pow(pi(), 10), $res);

        $formula = new calc_formula('=-8*(5/2)^2*(1-sqrt(4))-8');

        $res = $formula->evaluate();

        $this->assertSame(-8*pow((5/2), 2)*(1-sqrt(4))-8, $res);

    }

    /**

     * Tests some slightly more complex expressions.

     */

    public function test__error_handling(): void {

        $formula = new calc_formula('=pi( + a', array('a'=>10));

        $res = $formula->evaluate();

        $this->assertFalse($res);

        $this->assertSame(get_string('unexpectedoperator', 'mathslib', '+'), $formula->get_error());

        $formula = new calc_formula('=pi(');

        $res = $formula->evaluate();

        $this->assertSame($res, false);

        $this->assertSame(get_string('expectingaclosingbracket', 'mathslib'), $formula->get_error());

        $formula = new calc_formula('=pi()^');

        $res = $formula->evaluate();

        $this->assertSame($res, false);

        $this->assertSame(get_string('operatorlacksoperand', 'mathslib', '^'), $formula->get_error());

    }

    public function test_rounding_function(): void {

        // Rounding to the default number of decimal places.

        // The default == 0.

        $formula = new calc_formula('=round(2.5)');

        $this->assertSame(3.0, $formula->evaluate());

        $formula = new calc_formula('=round(1.5)');

        $this->assertSame(2.0, $formula->evaluate());

        $formula = new calc_formula('=round(-1.49)');

        $this->assertSame(-1.0, $formula->evaluate());

        $formula = new calc_formula('=round(-2.49)');

        $this->assertSame(-2.0, $formula->evaluate());

        $formula = new calc_formula('=round(-1.5)');

        $this->assertSame(-2.0, $formula->evaluate());

        $formula = new calc_formula('=round(-2.5)');

        $this->assertSame(-3.0, $formula->evaluate());

        $formula = new calc_formula('=ceil(2.5)');

        $this->assertSame(3.0, $formula->evaluate());

        $formula = new calc_formula('=ceil(1.5)');

        $this->assertSame(2.0, $formula->evaluate());

        $formula = new calc_formula('=ceil(-1.49)');

        $this->assertSame(-1.0, $formula->evaluate());

        $formula = new calc_formula('=ceil(-2.49)');

        $this->assertSame(-2.0, $formula->evaluate());

        $formula = new calc_formula('=ceil(-1.5)');

        $this->assertSame(-1.0, $formula->evaluate());

        $formula = new calc_formula('=ceil(-2.5)');

        $this->assertSame(-2.0, $formula->evaluate());

        $formula = new calc_formula('=floor(2.5)');

        $this->assertSame(2.0, $formula->evaluate());

        $formula = new calc_formula('=floor(1.5)');

        $this->assertSame(1.0, $formula->evaluate());

        $formula = new calc_formula('=floor(-1.49)');

        $this->assertSame(-2.0, $formula->evaluate());

        $formula = new calc_formula('=floor(-2.49)');

        $this->assertSame(-3.0, $formula->evaluate());

        $formula = new calc_formula('=floor(-1.5)');

        $this->assertSame(-2.0, $formula->evaluate());

        $formula = new calc_formula('=floor(-2.5)');

        $this->assertSame(-3.0, $formula->evaluate());

        // Rounding to an explicit number of decimal places.

        $formula = new calc_formula('=round(2.5, 1)');

        $this->assertSame(2.5, $formula->evaluate());

        $formula = new calc_formula('=round(2.5, 0)');

        $this->assertSame(3.0, $formula->evaluate());

        $formula = new calc_formula('=round(1.2345, 2)');

        $this->assertSame(1.23, $formula->evaluate());

        $formula = new calc_formula('=round(123.456, -1)');

        $this->assertSame(120.0, $formula->evaluate());

    }

    public function test_scientific_notation(): void {

        $formula = new calc_formula('=10e10');

        $this->assertEqualsWithDelta(1e11, $formula->evaluate(), 1e11 * 1e-15);

        $formula = new calc_formula('=10e-10');

        $this->assertEqualsWithDelta(1e-9, $formula->evaluate(), 1e11 * 1e-15);

        $formula = new calc_formula('=10e+10');

        $this->assertEqualsWithDelta(1e11, $formula->evaluate(), 1e11 * 1e-15);

        $formula = new calc_formula('=10e10*5');

        $this->assertEqualsWithDelta(5e11, $formula->evaluate(), 1e11 * 1e-15);

        $formula = new calc_formula('=10e10^2');

        $this->assertEqualsWithDelta(1e22, $formula->evaluate(), 1e22 * 1e-15);

    }

    public function test_rand_float(): void {

        $formula = new calc_formula('=rand_float()');

        $result = $formula->evaluate();

        $this->assertTrue(is_float($result));

    }

    /**

     * Tests the modulo operator.

     *

     * @covers calc_formula::evaluate

     * @dataProvider moduloOperatorData

     *

     * @param string $formula

     * @param array $values

     * @param int|float $expectedResult

     */

    public function shouldSupportModuloOperator($formula, $values, $expectedResult)

    {

        $formula = new calc_formula($formula);

        $formula->set_params($values);

        $this->assertEquals($expectedResult, $formula->evaluate());

    }

    /**

     * Data provider for shouldSupportModuloOperator

     *

     * @return array

     */

    public function moduloOperatorData() {

        return array(

            array(

                '=a%b', // 9%3 => 0

                array('a' => 9, 'b' => 3),

            ),

            array(

                '=a%b', // 10%3 => 1

                array('a' => 10, 'b' => 3),

                1

            ),

            array(

                '=10-a%(b+c*d)', // 10-10%(7-2*2) => 9

                array('a' => '10', 'b' => 7, 'c' => -2, 'd' => 2),

                9

            )

        );

    }

    /**

     * Tests the double minus as plus.

     *

     * @covers calc_formula::evaluate

     * @dataProvider doubleMinusData

     *

     * @param string $formula

     * @param array $values

     * @param int|float $expectedResult

     */

    public function shouldConsiderDoubleMinusAsPlus($formula, $values, $expectedResult)

    {

        $formula = new calc_formula($formula);

        $formula->set_params($values);

        $this->assertEquals($expectedResult, $formula->evaluate());

    }

    /**

     * Data provider for shouldConsiderDoubleMinusAsPlus

     *

     * @return array

     */

    public function doubleMinusData() {

        return array(

            array(

                '=a+b*c--d', // 1+2*3--4 => 1+6+4 => 11

                array(

                    'a' => 1,

                    'b' => 2,

                    'c' => 3,

                    'd' => 4

                ),

                11

            ),

            array(

                '=a+b*c--d', // 1+2*3---4 => 1+6-4 => 3

                array(

                    'a' => 1,

                    'b' => 2,

                    'c' => 3,

                    'd' => -4

                ),

                3

            )

        );

    }

}