Sokil\Mongo\BatchTest::testDelete PHP Method

    public function testDelete()
    {
        // insert
        $this->collection->batchInsert(array(array('a' => 1), array('a' => 2), array('a' => 3), array('a' => 4), array('a' => 5), array('a' => 6)));
        // delete
        $batch = new BatchDelete($this->collection);
        $batch->delete(array('a' => 2))->delete($this->collection->expression()->where('a', 4))->delete(function (Expression $e) {
            $e->where('a', 6);
        })->execute();
        // test
        $result = $this->collection->findAsArray()->sort(array('a' => 1))->map(function ($data) {
            unset($data['_id']);
            return $data;
        });
        $this->assertEquals(array_values($result), array(array('a' => 1), array('a' => 3), array('a' => 5)));
    }