Elgg\EntityIconServiceTest::testThrowsExceptionOnInvalidHookHandlerReturnForIconFile PHP Method

    public function testThrowsExceptionOnInvalidHookHandlerReturnForIconFile()
    {
        $callback = function ($hook, $type, $icon, $params) {
            return '/path/to/foo.jpg';
        };
        $this->hooks->registerHandler('entity:icon:file', 'object', $callback);
        $service = $this->createService();
        $service->getIcon($this->entity, 'small');
    }