$modassignfactory = new $lockfactoryclass('mod_assign');
$tooltaskfactory = new $lockfactoryclass('tool_task');

// Test for lock clashes between lock stores.
$assignlock = $modassignfactory->get_lock('abc1', 0);
$this->assertNotEmpty($assignlock, 'Get a lock "abc" from store "mod_assign"');

$tasklock = $tooltaskfactory->get_lock('abc1', 0);
$this->assertNotEmpty($tasklock, 'Get a lock "abc" from store "tool_task"');

$assignlock->release();
$tasklock->release();