public function testRemoveUnknownListener()
{
$result = false;
$callback = function () use(&$result) {
$result = true;
};
Hooks::on('foo', $callback);
Hooks::trigger('foo');
$this->assertTrue($result);
$result = false;
$this->assertFalse(Hooks::removeListener('bar', $callback));
Hooks::trigger('foo');
$this->assertTrue($result);
}