Alcaeus\MongoDbAdapter\Tests\Mongo\MongoCollectionTest::testInsertWithEmptyKey PHP Method

    public function testInsertWithEmptyKey()
    {
        $this->setExpectedException('MongoException', 'zero-length keys are not allowed, did you use $ with double quotes?');
        $document = ['' => 'foo'];
        $this->getCollection()->insert($document);
    }