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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/>.

/**
 * PHPunit tests for the cache API
 *
 * This file is part of Moodle's cache API, affectionately called MUC.
 * It contains the components that are requried in order to use caching.
 *
 * @package    core
 * @category   cache
 * @copyright  2012 Sam Hemelryk
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

// Include the necessary evils.
global $CFG;
require_once($CFG->dirroot.'/cache/locallib.php');
require_once($CFG->dirroot.'/cache/tests/fixtures/lib.php');

/**
 * PHPunit tests for the cache API
 *
 * @copyright  2012 Sam Hemelryk
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class core_cache_testcase extends advanced_testcase {

/**
     * Set things back to the default before each test.
     */
    public function setUp() {
        parent::setUp();
        cache_factory::reset();
        cache_config_testing::create_default_configuration();
    }

/**
     * Final task is to reset the cache system
     */
    public static function tearDownAfterClass() {
        parent::tearDownAfterClass();
        cache_factory::reset();
    }

/**
     * Returns the expected application cache store.
     * @return string
     */
    protected function get_expected_application_cache_store() {
        global $CFG;
        $expected = 'cachestore_file';

// Verify if we are using any of the available ways to use a different application store within tests.
        if (defined('TEST_CACHE_USING_APPLICATION_STORE') && preg_match('#[a-zA-Z][a-zA-Z0-9_]*#', TEST_CACHE_USING_APPLICATION_STORE)) {
            // 1st way. Using some of the testing servers.
            $expected = 'cachestore_'.(string)TEST_CACHE_USING_APPLICATION_STORE;

} else if (defined('TEST_CACHE_USING_ALT_CACHE_CONFIG_PATH') && TEST_CACHE_USING_ALT_CACHE_CONFIG_PATH && !empty($CFG->altcacheconfigpath)) {
            // 2nd way. Using an alternative configuration.
            $defaultstores = cache_helper::get_stores_suitable_for_mode_default();
            $instance = cache_config::instance();
            // Iterate over defined mode mappings until we get an application one not being the default.
            foreach ($instance->get_mode_mappings() as $mapping) {
                // If the store is not for application mode, ignore.
                if ($mapping['mode'] !== cache_store::MODE_APPLICATION) {
                    continue;
                }
                // If the store matches some default mapping store name, ignore.
                if (array_key_exists($mapping['store'], $defaultstores) && !empty($defaultstores[$mapping['store']]['default'])) {
                    continue;
                }
                // Arrived here, have found an application mode store not being the default mapped one (file),
                // that's the one we are using in the configuration for sure.
                $expected = 'cachestore_'.$mapping['store'];
            }
        }

return $expected;
    }

/**
     * Tests cache configuration
     */
    public function test_cache_config() {
        global $CFG;

if (defined('TEST_CACHE_USING_ALT_CACHE_CONFIG_PATH') && TEST_CACHE_USING_ALT_CACHE_CONFIG_PATH &&
            !empty($CFG->altcacheconfigpath)) {
            // We need to skip this test - it checks the default config structure, but very likely we arn't using the
            // default config structure here so theres no point in running the test.
            $this->markTestSkipped('Skipped testing default cache config structure as alt cache path is being used.');
        }

if (defined('TEST_CACHE_USING_APPLICATION_STORE')) {
            // We need to skip this test - it checks the default config structure, but very likely we arn't using the
            // default config structure here because we are testing against an alternative application store.
            $this->markTestSkipped('Skipped testing default cache config structure as alt application store is being used.');
        }

$instance = cache_config::instance();
        $this->assertInstanceOf('cache_config_testing', $instance);

$this->assertTrue(cache_config_testing::config_file_exists());

$stores = $instance->get_all_stores();
        $this->assertCount(3, $stores);
        foreach ($stores as $name => $store) {
            // Check its an array.
            $this->assertInternalType('array', $store);
            // Check the name is the key.
            $this->assertEquals($name, $store['name']);
            // Check that it has been declared default.
            $this->assertTrue($store['default']);
            // Required attributes = name + plugin + configuration + modes + features.
            $this->assertArrayHasKey('name', $store);
            $this->assertArrayHasKey('plugin', $store);
            $this->assertArrayHasKey('configuration', $store);
            $this->assertArrayHasKey('modes', $store);
            $this->assertArrayHasKey('features', $store);
        }

$modemappings = $instance->get_mode_mappings();
        $this->assertCount(3, $modemappings);
        $modes = array(
            cache_store::MODE_APPLICATION => false,
            cache_store::MODE_SESSION => false,
            cache_store::MODE_REQUEST => false,
        );
        foreach ($modemappings as $mapping) {
            // We expect 3 properties.
            $this->assertCount(3, $mapping);
            // Required attributes = mode + store.
            $this->assertArrayHasKey('mode', $mapping);
            $this->assertArrayHasKey('store', $mapping);
            // Record the mode.
            $modes[$mapping['mode']] = true;
        }

// Must have the default 3 modes and no more.
        $this->assertCount(3, $mapping);
        foreach ($modes as $mode) {
            $this->assertTrue($mode);
        }

$definitions = $instance->get_definitions();
        // The event invalidation definition is required for the cache API and must be there.
        $this->assertArrayHasKey('core/eventinvalidation', $definitions);

$definitionmappings = $instance->get_definition_mappings();
        foreach ($definitionmappings as $mapping) {
            // Required attributes = definition + store.
            $this->assertArrayHasKey('definition', $mapping);
            $this->assertArrayHasKey('store', $mapping);
        }
    }

/**
     * Tests for cache keys that would break on windows.
     */
    public function test_windows_nasty_keys() {
        $instance = cache_config_testing::instance();
        $instance->phpunit_add_definition('phpunit/windowskeytest', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'windowskeytest',
            'simplekeys' => true,
            'simpledata' => true
        ));
        $cache = cache::make('phpunit', 'windowskeytest');
        $this->assertTrue($cache->set('contest', 'test data 1'));
        $this->assertEquals('test data 1', $cache->get('contest'));
    }

/**
     * Tests set_identifiers fails post cache creation.
     *
     * set_identifiers cannot be called after initial cache instantiation, as you need to create a difference cache.
     */
    public function test_set_identifiers() {
        $instance = cache_config_testing::instance();
        $instance->phpunit_add_definition('phpunit/identifier', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'identifier',
            'simplekeys' => true,
            'simpledata' => true,
            'staticacceleration' => true
        ));
        $cache = cache::make('phpunit', 'identifier', array('area'));
        $this->assertTrue($cache->set('contest', 'test data 1'));
        $this->assertEquals('test data 1', $cache->get('contest'));

$this->expectException('coding_exception');
        $cache->set_identifiers(array());
    }

/**
     * Tests the default application cache
     */
    public function test_default_application_cache() {
        $cache = cache::make_from_params(cache_store::MODE_APPLICATION, 'phpunit', 'applicationtest');
        $this->assertInstanceOf('cache_application', $cache);
        $this->run_on_cache($cache);

$instance = cache_config_testing::instance(true);
        $instance->phpunit_add_definition('phpunit/test_default_application_cache', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'test_default_application_cache',
            'staticacceleration' => true,
            'staticaccelerationsize' => 1
        ));
        $cache = cache::make('phpunit', 'test_default_application_cache');
        $this->assertInstanceOf('cache_application', $cache);
        $this->run_on_cache($cache);
    }

/**
     * Tests the default session cache
     */
    public function test_default_session_cache() {
        $cache = cache::make_from_params(cache_store::MODE_SESSION, 'phpunit', 'applicationtest');
        $this->assertInstanceOf('cache_session', $cache);
        $this->run_on_cache($cache);
    }

/**
     * Tests the default request cache
     */
    public function test_default_request_cache() {
        $cache = cache::make_from_params(cache_store::MODE_REQUEST, 'phpunit', 'applicationtest');
        $this->assertInstanceOf('cache_request', $cache);
        $this->run_on_cache($cache);
    }

/**
     * Tests using a cache system when there are no stores available (who knows what the admin did to achieve this).
     */
    public function test_on_cache_without_store() {
        $instance = cache_config_testing::instance(true);
        $instance->phpunit_add_definition('phpunit/nostoretest1', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'nostoretest1',
        ));
        $instance->phpunit_add_definition('phpunit/nostoretest2', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'nostoretest2',
            'staticacceleration' => true
        ));
        $instance->phpunit_remove_stores();

$cache = cache::make('phpunit', 'nostoretest1');
        $this->run_on_cache($cache);

$cache = cache::make('phpunit', 'nostoretest2');
        $this->run_on_cache($cache);
    }

/**
     * Runs a standard series of access and use tests on a cache instance.
     *
     * This function is great because we can use it to ensure all of the loaders perform exactly the same way.
     *
     * @param cache_loader $cache
     */
    protected function run_on_cache(cache_loader $cache) {
        $key = 'contestkey';
        $datascalars = array('test data', null);
        $dataarray = array('contest' => 'data', 'part' => 'two');
        $dataobject = (object)$dataarray;

foreach ($datascalars as $datascalar) {
            $this->assertTrue($cache->purge());

// Check all read methods.
            $this->assertFalse($cache->get($key));
            $this->assertFalse($cache->has($key));
            $result = $cache->get_many(array($key));
            $this->assertCount(1, $result);
            $this->assertFalse(reset($result));
            $this->assertFalse($cache->has_any(array($key)));
            $this->assertFalse($cache->has_all(array($key)));

// Set the data.
            $this->assertTrue($cache->set($key, $datascalar));
            // Setting it more than once should be permitted.
            $this->assertTrue($cache->set($key, $datascalar));

// Recheck the read methods.
            $this->assertEquals($datascalar, $cache->get($key));
            $this->assertTrue($cache->has($key));
            $result = $cache->get_many(array($key));
            $this->assertCount(1, $result);
            $this->assertEquals($datascalar, reset($result));
            $this->assertTrue($cache->has_any(array($key)));
            $this->assertTrue($cache->has_all(array($key)));

// Delete it.
            $this->assertTrue($cache->delete($key));

// Check its gone.
            $this->assertFalse($cache->get($key));
            $this->assertFalse($cache->has($key));
        }

// Test arrays.
        $this->assertTrue($cache->set($key, $dataarray));
        $this->assertEquals($dataarray, $cache->get($key));

// Test objects.
        $this->assertTrue($cache->set($key, $dataobject));
        $this->assertEquals($dataobject, $cache->get($key));

$starttime = microtime(true);
        $specobject = new cache_phpunit_dummy_object('red', 'blue', $starttime);
        $this->assertTrue($cache->set($key, $specobject));
        $result = $cache->get($key);
        $this->assertInstanceOf('cache_phpunit_dummy_object', $result);
        $this->assertEquals('red_ptc_wfc', $result->property1);
        $this->assertEquals('blue_ptc_wfc', $result->property2);
        $this->assertGreaterThan($starttime, $result->propertytime);

// Test array of objects.
        $specobject = new cache_phpunit_dummy_object('red', 'blue', $starttime);
        $data = new cacheable_object_array(array(
            clone($specobject),
            clone($specobject),
            clone($specobject))
        );
        $this->assertTrue($cache->set($key, $data));
        $result = $cache->get($key);
        $this->assertInstanceOf('cacheable_object_array', $result);
        $this->assertCount(3, $data);
        foreach ($result as $item) {
            $this->assertInstanceOf('cache_phpunit_dummy_object', $item);
            $this->assertEquals('red_ptc_wfc', $item->property1);
            $this->assertEquals('blue_ptc_wfc', $item->property2);
            // Ensure that wake from cache is called in all cases.
            $this->assertGreaterThan($starttime, $item->propertytime);
        }

// Test set many.
        $cache->set_many(array('key1' => 'data1', 'key2' => 'data2', 'key3' => null));
        $this->assertEquals('data1', $cache->get('key1'));
        $this->assertEquals('data2', $cache->get('key2'));
        $this->assertEquals(null, $cache->get('key3'));
        $this->assertTrue($cache->delete('key1'));
        $this->assertTrue($cache->delete('key2'));
        $this->assertTrue($cache->delete('key3'));

$cache->set_many(array(
            'key1' => array(1, 2, 3),
            'key2' => array(3, 2, 1),
        ));
        $this->assertInternalType('array', $cache->get('key1'));
        $this->assertInternalType('array', $cache->get('key2'));
        $this->assertCount(3, $cache->get('key1'));
        $this->assertCount(3, $cache->get('key2'));
        $this->assertInternalType('array', $cache->get_many(array('key1', 'key2')));
        $this->assertCount(2, $cache->get_many(array('key1', 'key2')));
        $this->assertEquals(2, $cache->delete_many(array('key1', 'key2')));

// Test delete many.
        $this->assertTrue($cache->set('key1', 'data1'));
        $this->assertTrue($cache->set('key2', 'data2'));
        $this->assertTrue($cache->set('key3', null));

$this->assertEquals('data1', $cache->get('key1'));
        $this->assertEquals('data2', $cache->get('key2'));
        $this->assertEquals(null, $cache->get('key3'));

$this->assertEquals(3, $cache->delete_many(array('key1', 'key2', 'key3')));

$this->assertFalse($cache->get('key1'));
        $this->assertFalse($cache->get('key2'));
        $this->assertFalse($cache->get('key3'));

// Quick reference test.
        $obj = new stdClass;
        $obj->key = 'value';
        $ref =& $obj;
        $this->assertTrue($cache->set('obj', $obj));

$obj->key = 'eulav';
        $var = $cache->get('obj');
        $this->assertInstanceOf('stdClass', $var);
        $this->assertEquals('value', $var->key);

$ref->key = 'eulav';
        $var = $cache->get('obj');
        $this->assertInstanceOf('stdClass', $var);
        $this->assertEquals('value', $var->key);

$this->assertTrue($cache->delete('obj'));

// Deep reference test.
        $obj1 = new stdClass;
        $obj1->key = 'value';
        $obj2 = new stdClass;
        $obj2->key = 'test';
        $obj3 = new stdClass;
        $obj3->key = 'pork';
        $obj1->subobj =& $obj2;
        $obj2->subobj =& $obj3;
        $this->assertTrue($cache->set('obj', $obj1));

$obj1->key = 'eulav';
        $obj2->key = 'tset';
        $obj3->key = 'krop';
        $var = $cache->get('obj');
        $this->assertInstanceOf('stdClass', $var);
        $this->assertEquals('value', $var->key);
        $this->assertInstanceOf('stdClass', $var->subobj);
        $this->assertEquals('test', $var->subobj->key);
        $this->assertInstanceOf('stdClass', $var->subobj->subobj);
        $this->assertEquals('pork', $var->subobj->subobj->key);
        $this->assertTrue($cache->delete('obj'));

// Death reference test... basically we don't want this to die.
        $obj = new stdClass;
        $obj->key = 'value';
        $obj->self =& $obj;
        $this->assertTrue($cache->set('obj', $obj));
        $var = $cache->get('obj');
        $this->assertInstanceOf('stdClass', $var);
        $this->assertEquals('value', $var->key);

// Reference test after retrieve.
        $obj = new stdClass;
        $obj->key = 'value';
        $this->assertTrue($cache->set('obj', $obj));

$var1 = $cache->get('obj');
        $this->assertInstanceOf('stdClass', $var1);
        $this->assertEquals('value', $var1->key);
        $var1->key = 'eulav';
        $this->assertEquals('eulav', $var1->key);

$var2 = $cache->get('obj');
        $this->assertInstanceOf('stdClass', $var2);
        $this->assertEquals('value', $var2->key);

$this->assertTrue($cache->delete('obj'));

// Death reference test on get_many... basically we don't want this to die.
        $obj = new stdClass;
        $obj->key = 'value';
        $obj->self =& $obj;
        $this->assertEquals(1, $cache->set_many(array('obj' => $obj)));
        $var = $cache->get_many(array('obj'));
        $this->assertInstanceOf('stdClass', $var['obj']);
        $this->assertEquals('value', $var['obj']->key);

// Reference test after retrieve.
        $obj = new stdClass;
        $obj->key = 'value';
        $this->assertEquals(1, $cache->set_many(array('obj' => $obj)));

$var1 = $cache->get_many(array('obj'));
        $this->assertInstanceOf('stdClass', $var1['obj']);
        $this->assertEquals('value', $var1['obj']->key);
        $var1['obj']->key = 'eulav';
        $this->assertEquals('eulav', $var1['obj']->key);

$var2 = $cache->get_many(array('obj'));
        $this->assertInstanceOf('stdClass', $var2['obj']);
        $this->assertEquals('value', $var2['obj']->key);

$this->assertTrue($cache->delete('obj'));

// Test strictness exceptions.
        try {
            $cache->get('exception', MUST_EXIST);
            $this->fail('Exception expected from cache::get using MUST_EXIST');
        } catch (Exception $e) {
            $this->assertTrue(true);
        }
        try {
            $cache->get_many(array('exception1', 'exception2'), MUST_EXIST);
            $this->fail('Exception expected from cache::get_many using MUST_EXIST');
        } catch (Exception $e) {
            $this->assertTrue(true);
        }
        $cache->set('test', 'test');
        try {
            $cache->get_many(array('test', 'exception'), MUST_EXIST);
            $this->fail('Exception expected from cache::get_many using MUST_EXIST');
        } catch (Exception $e) {
            $this->assertTrue(true);
        }
    }

/**
     * Tests a definition using a data loader
     */
    public function test_definition_data_loader() {
        $instance = cache_config_testing::instance(true);
        $instance->phpunit_add_definition('phpunit/datasourcetest', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'datasourcetest',
            'datasource' => 'cache_phpunit_dummy_datasource',
            'datasourcefile' => 'cache/tests/fixtures/lib.php'
        ));

$cache = cache::make('phpunit', 'datasourcetest');
        $this->assertInstanceOf('cache_application', $cache);

// Purge it to be sure.
        $this->assertTrue($cache->purge());
        // It won't be there yet.
        $this->assertFalse($cache->has('Test'));
        // It should load it ;).
        $this->assertTrue($cache->has('Test', true));

// Purge it to be sure.
        $this->assertTrue($cache->purge());
        $this->assertEquals('Test has no value really.', $cache->get('Test'));

// Test multiple values.
        $this->assertTrue($cache->purge());
        $this->assertTrue($cache->set('b', 'B'));
        $result = $cache->get_many(array('a', 'b', 'c'));
        $this->assertInternalType('array', $result);
        $this->assertCount(3, $result);
        $this->assertArrayHasKey('a', $result);
        $this->assertArrayHasKey('b', $result);
        $this->assertArrayHasKey('c', $result);
        $this->assertEquals('a has no value really.', $result['a']);
        $this->assertEquals('B', $result['b']);
        $this->assertEquals('c has no value really.', $result['c']);
    }

/**
     * Tests a definition using an overridden loader
     */
    public function test_definition_overridden_loader() {
        $instance = cache_config_testing::instance(true);
        $instance->phpunit_add_definition('phpunit/overridetest', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'overridetest',
            'overrideclass' => 'cache_phpunit_dummy_overrideclass',
            'overrideclassfile' => 'cache/tests/fixtures/lib.php'
        ));
        $cache = cache::make('phpunit', 'overridetest');
        $this->assertInstanceOf('cache_phpunit_dummy_overrideclass', $cache);
        $this->assertInstanceOf('cache_application', $cache);
        // Purge it to be sure.
        $this->assertTrue($cache->purge());
        // It won't be there yet.
        $this->assertFalse($cache->has('Test'));
        // Add it.
        $this->assertTrue($cache->set('Test', 'Test has no value really.'));
        // Check its there.
        $this->assertEquals('Test has no value really.', $cache->get('Test'));
    }

/**
     * Test the mappingsonly setting.
     */
    public function test_definition_mappings_only() {
        /** @var cache_config_testing $instance */
        $instance = cache_config_testing::instance(true);
        $instance->phpunit_add_definition('phpunit/mappingsonly', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'mappingsonly',
            'mappingsonly' => true
        ), false);
        $instance->phpunit_add_definition('phpunit/nonmappingsonly', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'nonmappingsonly',
            'mappingsonly' => false
        ), false);

$cacheonly = cache::make('phpunit', 'mappingsonly');
        $this->assertInstanceOf('cache_application', $cacheonly);
        $this->assertEquals('cachestore_dummy', $cacheonly->phpunit_get_store_class());

$expected = $this->get_expected_application_cache_store();
        $cachenon = cache::make('phpunit', 'nonmappingsonly');
        $this->assertInstanceOf('cache_application', $cachenon);
        $this->assertEquals($expected, $cachenon->phpunit_get_store_class());
    }

/**
     * Test a very basic definition.
     */
    public function test_definition() {
        $instance = cache_config_testing::instance();
        $instance->phpunit_add_definition('phpunit/test', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'test',
        ));
        $cache = cache::make('phpunit', 'test');

$this->assertTrue($cache->set('testkey1', 'test data 1'));
        $this->assertEquals('test data 1', $cache->get('testkey1'));
        $this->assertTrue($cache->set('testkey2', 'test data 2'));
        $this->assertEquals('test data 2', $cache->get('testkey2'));
    }

/**
     * Test a definition using the simple keys.
     */
    public function test_definition_simplekeys() {
        $instance = cache_config_testing::instance();
        $instance->phpunit_add_definition('phpunit/simplekeytest', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'simplekeytest',
            'simplekeys' => true
        ));
        $cache = cache::make('phpunit', 'simplekeytest');

$cache->purge();

$this->assertTrue($cache->set('1', 'test data 1'));
        $this->assertEquals('test data 1', $cache->get('1'));
        $this->assertTrue($cache->set('2', 'test data 2'));
        $this->assertEquals('test data 2', $cache->get('2'));
    }

/**
     * Test a negative TTL on an application cache.
     */
    public function test_application_ttl_negative() {
        $instance = cache_config_testing::instance(true);
        $instance->phpunit_add_definition('phpunit/ttltest', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'ttltest',
            'ttl' => -86400 // Set to a day in the past to be extra sure.
        ));
        $cache = cache::make('phpunit', 'ttltest');
        $this->assertInstanceOf('cache_application', $cache);

// Purge it to be sure.
        $this->assertTrue($cache->purge());
        // It won't be there yet.
        $this->assertFalse($cache->has('Test'));
        // Set it now.
        $this->assertTrue($cache->set('Test', 'Test'));
        // Check its not there.
        $this->assertFalse($cache->has('Test'));
        // Double check by trying to get it.
        $this->assertFalse($cache->get('Test'));

// Test with multiple keys.
        $this->assertEquals(3, $cache->set_many(array('a' => 'A', 'b' => 'B', 'c' => 'C')));
        $result = $cache->get_many(array('a', 'b', 'c'));
        $this->assertInternalType('array', $result);
        $this->assertCount(3, $result);
        $this->assertArrayHasKey('a', $result);
        $this->assertArrayHasKey('b', $result);
        $this->assertArrayHasKey('c', $result);
        $this->assertFalse($result['a']);
        $this->assertFalse($result['b']);
        $this->assertFalse($result['c']);

// Test with multiple keys including missing ones.
        $result = $cache->get_many(array('a', 'c', 'e'));
        $this->assertInternalType('array', $result);
        $this->assertCount(3, $result);
        $this->assertArrayHasKey('a', $result);
        $this->assertArrayHasKey('c', $result);
        $this->assertArrayHasKey('e', $result);
        $this->assertFalse($result['a']);
        $this->assertFalse($result['c']);
        $this->assertFalse($result['e']);
    }

/**
     * Test a positive TTL on an application cache.
     */
    public function test_application_ttl_positive() {
        $instance = cache_config_testing::instance(true);
        $instance->phpunit_add_definition('phpunit/ttltest', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'ttltest',
            'ttl' => 86400 // Set to a day in the future to be extra sure.
        ));
        $cache = cache::make('phpunit', 'ttltest');
        $this->assertInstanceOf('cache_application', $cache);

// Purge it to be sure.
        $this->assertTrue($cache->purge());
        // It won't be there yet.
        $this->assertFalse($cache->has('Test'));
        // Set it now.
        $this->assertTrue($cache->set('Test', 'Test'));
        // Check its there.
        $this->assertTrue($cache->has('Test'));
        // Double check by trying to get it.
        $this->assertEquals('Test', $cache->get('Test'));

// Test with multiple keys.
        $this->assertEquals(3, $cache->set_many(array('a' => 'A', 'b' => 'B', 'c' => 'C')));
        $result = $cache->get_many(array('a', 'b', 'c'));
        $this->assertInternalType('array', $result);
        $this->assertCount(3, $result);
        $this->assertArrayHasKey('a', $result);
        $this->assertArrayHasKey('b', $result);
        $this->assertArrayHasKey('c', $result);
        $this->assertEquals('A', $result['a']);
        $this->assertEquals('B', $result['b']);
        $this->assertEquals('C', $result['c']);

// Test with multiple keys including missing ones.
        $result = $cache->get_many(array('a', 'c', 'e'));
        $this->assertInternalType('array', $result);
        $this->assertCount(3, $result);
        $this->assertArrayHasKey('a', $result);
        $this->assertArrayHasKey('c', $result);
        $this->assertArrayHasKey('e', $result);
        $this->assertEquals('A', $result['a']);
        $this->assertEquals('C', $result['c']);
        $this->assertEquals(false, $result['e']);
    }

/**
     * Test a negative TTL on an session cache.
     */
    public function test_session_ttl_positive() {
        $instance = cache_config_testing::instance(true);
        $instance->phpunit_add_definition('phpunit/ttltest', array(
            'mode' => cache_store::MODE_SESSION,
            'component' => 'phpunit',
            'area' => 'ttltest',
            'ttl' => 86400 // Set to a day in the future to be extra sure.
        ));
        $cache = cache::make('phpunit', 'ttltest');
        $this->assertInstanceOf('cache_session', $cache);

// Purge it to be sure.
        $this->assertTrue($cache->purge());
        // It won't be there yet.
        $this->assertFalse($cache->has('Test'));
        // Set it now.
        $this->assertTrue($cache->set('Test', 'Test'));
        // Check its there.
        $this->assertTrue($cache->has('Test'));
        // Double check by trying to get it.
        $this->assertEquals('Test', $cache->get('Test'));

// Test with multiple keys.
        $this->assertEquals(3, $cache->set_many(array('a' => 'A', 'b' => 'B', 'c' => 'C')));
        $result = $cache->get_many(array('a', 'b', 'c'));
        $this->assertInternalType('array', $result);
        $this->assertCount(3, $result);
        $this->assertArrayHasKey('a', $result);
        $this->assertArrayHasKey('b', $result);
        $this->assertArrayHasKey('c', $result);
        $this->assertEquals('A', $result['a']);
        $this->assertEquals('B', $result['b']);
        $this->assertEquals('C', $result['c']);

// Test with multiple keys including missing ones.
        $result = $cache->get_many(array('a', 'c', 'e'));
        $this->assertInternalType('array', $result);
        $this->assertCount(3, $result);
        $this->assertArrayHasKey('a', $result);
        $this->assertArrayHasKey('c', $result);
        $this->assertArrayHasKey('e', $result);
        $this->assertEquals('A', $result['a']);
        $this->assertEquals('C', $result['c']);
        $this->assertEquals(false, $result['e']);
    }

/**
     * Tests manual locking operations on an application cache
     */
    public function test_application_manual_locking() {
        $instance = cache_config_testing::instance();
        $instance->phpunit_add_definition('phpunit/lockingtest', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'lockingtest'
        ));
        $cache1 = cache::make('phpunit', 'lockingtest');
        $cache2 = clone($cache1);

$this->assertTrue($cache1->set('testkey', 'test data'));
        $this->assertTrue($cache2->set('testkey', 'test data'));

$this->assertTrue($cache1->acquire_lock('testkey'));
        $this->assertFalse($cache2->acquire_lock('testkey'));

$this->assertTrue($cache1->check_lock_state('testkey'));
        $this->assertFalse($cache2->check_lock_state('testkey'));

$this->assertTrue($cache1->release_lock('testkey'));
        $this->assertFalse($cache2->release_lock('testkey'));

$this->assertTrue($cache1->set('testkey', 'test data'));
        $this->assertTrue($cache2->set('testkey', 'test data'));
    }

/**
     * Tests application cache event invalidation
     */
    public function test_application_event_invalidation() {
        $instance = cache_config_testing::instance();
        $instance->phpunit_add_definition('phpunit/eventinvalidationtest', array(
            'mode' => cache_store::MODE_APPLICATION,
            'component' => 'phpunit',
            'area' => 'eventinvalidationtest',
            'invalidationevents' => array(
                'crazyevent'
            )
        ));
        $cache = cache::make('phpunit', 'eventinvalidationtest');

// Test invalidating a single entry.
        cache_helper::invalidate_by_event('crazyevent', array('testkey1'));

$this->assertFalse($cache->get('testkey1'));
        $this->assertEquals('test data 2', $cache->get('testkey2'));