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80 lines
2.9 KiB
PHP
80 lines
2.9 KiB
PHP
<?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 core_cache;
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/**
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* Unit tests for cache_store functionality.
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*
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* @package core_cache
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* @copyright 2021 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class store_test extends \advanced_testcase {
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/**
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* Tests the default implementation of cache_size_details, which does some
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* complicated statistics.
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*/
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public function test_cache_size_details(): void {
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// Fill a store with 100 entries of varying size.
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$store = self::create_static_store();
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for ($i = 0; $i < 100; $i++) {
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$store->set('key' . $i, str_repeat('x', $i));
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}
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// Do the statistics for 10 random picks.
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$details = $store->cache_size_details(10);
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$this->assertTrue($details->supported);
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$this->assertEquals(100, $details->items);
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// Min/max possible means if it picks the smallest/largest 10.
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$this->assertGreaterThan(22, $details->mean);
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$this->assertLessThan(115, $details->mean);
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// Min/max possible SD.
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$this->assertLessThan(49, $details->sd);
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$this->assertGreaterThan(2.8, $details->sd);
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// Lowest possible confidence margin is about 1.74.
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$this->assertGreaterThan(1.7, $details->margin);
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// Repeat the statistics for a pick of all 100 entries (exact).
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$details = $store->cache_size_details(100);
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$this->assertTrue($details->supported);
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$this->assertEquals(100, $details->items);
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$this->assertEqualsWithDelta(69.3, $details->mean, 0.1);
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$this->assertEqualsWithDelta(29.2, $details->sd, 0.1);
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$this->assertEquals(0, $details->margin);
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}
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/**
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* Creates a static store for testing.
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*
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* @return \cachestore_static Store
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*/
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protected static function create_static_store(): \cachestore_static {
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require_once(__DIR__ . '/../stores/static/lib.php');
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$store = new \cachestore_static('frog');
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$definition = \cache_definition::load('zombie', [
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'mode' => \cache_store::MODE_REQUEST,
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'component' => 'phpunit',
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'area' => 'store_test',
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'simplekeys' => true
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]);
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$store->initialise($definition);
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return $store;
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}
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}
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