public function testLower()
{
$plugin = new BasicPlugin();
$result = $plugin->callFilter('lower', 'FOO');
$this->assertEquals('foo', $result);
ob_start();
$result = $plugin->callFunction('var_dump', ['FOO']);
$contents = ob_get_contents();
ob_end_clean();
$result = $plugin->callFunction('memory_usage', []);
$this->assertGreaterThan(0, strlen($result));
}
