Test methods provided by the QueryPluginBase.
\Drupal\views\Plugin\views\query\QueryPluginBase
protected function queryMethodsTests() {
$view = views_get_view('test_view');
$view
->setDisplay();
$view
->initQuery();
$this
->assertFalse($view->query
->getLimit(), 'Default to an empty limit.');
$rand_number = rand(5, 10);
$view->query
->setLimit($rand_number);
$this
->assertEqual($view->query
->getLimit(), $rand_number, 'set_limit adapts the amount of items.');
}