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<?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;
}
}