public function testIsNaryPredicate()
{
$predicate = Callables::newPredicate(function ($a, $b, $c) {
return false;
});
$this->assertFalse(Callables::isUnaryPredicate($predicate));
$this->assertFalse(Callables::isBinaryPredicate($predicate));
$this->assertTrue(Callables::isNaryPredicate($predicate));
}