public function testDeleteIndexes()
{
$newCollection = $this->getCheckDatabase()->selectCollection('test');
$newCollection->createIndex(['bar' => 1]);
$expected = ['nIndexesWas' => 2, 'msg' => 'non-_id indexes dropped for collection', 'ok' => 1.0];
$this->assertSame($expected, $this->getcollection()->deleteIndexes());
$this->assertCount(1, iterator_to_array($newCollection->listIndexes()));
// ID index is present by default
}