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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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namespace mod_lesson;
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use mod_lesson\local\numeric\helper;
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/**
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 * This class contains the test cases for the numeric helper functions
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 *
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 * @package   mod_lesson
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 * @category  test
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 * @copyright 2020 Peter Dias
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU Public License
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 */
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final class numeric_helper_test extends \advanced_testcase {
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    /**
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     * Test the lesson_unformat_numeric_value function.
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     *
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     * @dataProvider lesson_unformat_dataprovider
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     * @param $decsep
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     * @param $tests
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     */
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    public function test_lesson_unformat_numeric_value($decsep, $tests): void {
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        $this->define_local_decimal_separator($decsep);
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        foreach ($tests as $test) {
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            $this->assertEquals($test[1], helper::lesson_unformat_numeric_value($test[0]));
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        }
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    }
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    /**
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     * Test the lesson_format_numeric_value function.
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     *
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     * @dataProvider lesson_format_dataprovider
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     * @param $decsep
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     * @param $tests
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     */
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    public function test_lesson_format_numeric_value($decsep, $tests): void {
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        $this->define_local_decimal_separator($decsep);
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        foreach ($tests as $test) {
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            $this->assertEquals($test[1], helper::lesson_format_numeric_value($test[0]));
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        }
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    }
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    /**
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     * Provide various cases for the unformat test function
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     *
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     * @return array
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     */
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    public static function lesson_unformat_dataprovider(): array {
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        return [
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            "Using a decimal as a separator" => [
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                "decsep" => ".",
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                "tests" => [
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                    ["2.1", 2.1],
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                    ["1:4.2", "1:4.2"],
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                    ["2,1", 2],
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                    ["1:4,2", "1:4"],
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                    ["", null]
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                ]
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            ],
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            "Using a comma as a separator" => [
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                "decsep" => ",",
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                "tests" => [
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                    ["2,1", 2.1],
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                    ["1:4,2", "1:4.2"],
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                    ["2.1", 2.1],
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                    ["1:4.2", "1:4.2"],
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                ]
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            ],
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            "Using a X as a separator" => [
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                "decsep" => "X",
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                "tests" => [
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                    ["2X1", 2.1],
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                    ["1:4X2", "1:4.2"],
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                    ["2.1", 2.1],
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                    ["1:4.2", "1:4.2"],
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                ]
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            ]
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        ];
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    }
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    /**
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     * Provide various cases for the unformat test function
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     *
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     * @return array
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     */
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    public static function lesson_format_dataprovider(): array {
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        return [
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            "Using a decimal as a separator" => [
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                "decsep" => ".",
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                "tests" => [
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                    ["2.1", 2.1],
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                    ["1:4.2", "1:4.2"],
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                    ["2,1", "2,1"],
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                    ["1:4,2", "1:4,2"]
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                ]
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            ],
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            "Using a comma as a separator" => [
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                "decsep" => ",",
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                "tests" => [
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                    ["2,1", "2,1"],
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                    ["1:4,2", "1:4,2"],
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                    ["2.1", "2,1"],
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                    [2.1, "2,1"],
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                    ["1:4.2", "1:4,2"],
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                ]
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            ],
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            "Using a X as a separator" => [
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                "decsep" => "X",
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                "tests" => [
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                    ["2X1", "2X1"],
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                    ["1:4X2", "1:4X2"],
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                    ["2.1", "2X1"],
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                    ["1:4.2", "1:4X2"],
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                ]
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            ]
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        ];
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    }
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    /**
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     * Define a local decimal separator.
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     *
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     * It is not possible to directly change the result of get_string in
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     * a unit test. Instead, we create a language pack for language 'xx' in
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     * dataroot and make langconfig.php with the string we need to change.
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     * The default example separator used here is 'X'.
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     *
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     * @param string $decsep Separator character. Defaults to `'X'`.
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     */
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    protected function define_local_decimal_separator(string $decsep = 'X') {
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        global $SESSION, $CFG;
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        $SESSION->lang = 'xx';
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        $langconfig = "<?php\n\$string['decsep'] = '$decsep';";
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        $langfolder = $CFG->dataroot . '/lang/xx';
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        check_dir_exists($langfolder);
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        file_put_contents($langfolder . '/langconfig.php', $langconfig);
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        // Ensure the new value is picked up and not taken from the cache.
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        $stringmanager = get_string_manager();
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        $stringmanager->reset_caches(true);
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    }
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}