private function assertXNodesWithLabelExist($label, $number = 1)
{
$query = 'MATCH (n:' . $label . ') RETURN count(n) as c';
$result = $this->client->run($query, null, null, 'http');
$this->assertNotNull($result->firstRecord());
$this->assertEquals($number, $result->firstRecord()->get('c'));
}