Sokil\Mongo\CollectionTest::testDeleteDocuments_ExpressionAsObject PHP Method

    public function testDeleteDocuments_ExpressionAsObject()
    {
        // add
        $this->collection->createDocument(array('param' => 1))->save();
        $this->collection->createDocument(array('param' => 2))->save();
        $this->collection->createDocument(array('param' => 3))->save();
        $this->collection->createDocument(array('param' => 4))->save();
        // delete
        $this->collection->deleteDocuments($this->collection->expression()->whereGreater('param', 2));
        // test
        $this->assertEquals(2, count($this->collection));
    }