public function testIsNaryConsumer()
{
$consumer = Callables::newConsumer(function ($a, $b, $c) {
return false;
});
$this->assertFalse(Callables::isUnaryConsumer($consumer));
$this->assertFalse(Callables::isBinaryConsumer($consumer));
$this->assertTrue(Callables::isNaryConsumer($consumer));
}