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_cache;

/**

 * Unit tests for cache_store functionality.

 *

 * @package core_cache

 * @copyright 2021 The Open University

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

 */

class store_test extends \advanced_testcase {

    /**

     * Tests the default implementation of cache_size_details, which does some

     * complicated statistics.

     */

    public function test_cache_size_details(): void {

        // Fill a store with 100 entries of varying size.

        $store = self::create_static_store();

        for ($i = 0; $i < 100; $i++) {

            $store->set('key' . $i, str_repeat('x', $i));

        }

        // Do the statistics for 10 random picks.

        $details = $store->cache_size_details(10);

        $this->assertTrue($details->supported);

        $this->assertEquals(100, $details->items);

        // Min/max possible means if it picks the smallest/largest 10.

        $this->assertGreaterThan(22, $details->mean);

        $this->assertLessThan(115, $details->mean);

        // Min/max possible SD.

        $this->assertLessThan(49, $details->sd);

        $this->assertGreaterThan(2.8, $details->sd);

        // Lowest possible confidence margin is about 1.74.

        $this->assertGreaterThan(1.7, $details->margin);

        // Repeat the statistics for a pick of all 100 entries (exact).

        $details = $store->cache_size_details(100);

        $this->assertTrue($details->supported);

        $this->assertEquals(100, $details->items);

        $this->assertEqualsWithDelta(69.3, $details->mean, 0.1);

        $this->assertEqualsWithDelta(29.2, $details->sd, 0.1);

        $this->assertEquals(0, $details->margin);

    }

    /**

     * Creates a static store for testing.

     *

     * @return \cachestore_static Store

     */

    protected static function create_static_store(): \cachestore_static {

        require_once(__DIR__ . '/../stores/static/lib.php');

        $store = new \cachestore_static('frog');

        $definition = \cache_definition::load('zombie', [

                'mode' => \cache_store::MODE_REQUEST,

                'component' => 'phpunit',

                'area' => 'store_test',

                'simplekeys' => true

        ]);

        $store->initialise($definition);

        return $store;

    }

}