<?php
 namespace MongoDB\Tests\Operation;
 use MongoDB\Operation\DropCollection;
 use MongoDB\Operation\InsertOne;
 use MongoDB\Operation\ListCollections;
 use MongoDB\Tests\CommandObserver;
 use function sprintf;
 use function version_compare;
 class DropCollectionFunctionalTest extends FunctionalTestCase {
 public function testDefaultWriteConcernIsOmitted() {
 (new CommandObserver())->observe( function () {
 $operation = new DropCollection( $this->getDatabaseName(), $this->getCollectionName(), ['writeConcern' => $this->createDefaultWriteConcern()] );
 $operation->execute($this->getPrimaryServer());
 }
, function (array $event) {
 $this->assertObjectNotHasAttribute('writeConcern', $event['started']->getCommand());
 }
 );
 }
 public function testDropExistingCollection() {
 $server = $this->getPrimaryServer();
 $insertOne = new InsertOne($this->getDatabaseName(), $this->getCollectionName(), ['x' => 1]);
 $writeResult = $insertOne->execute($server);
 $this->assertEquals(1, $writeResult->getInsertedCount());
 $operation = new DropCollection($this->getDatabaseName(), $this->getCollectionName());
 $operation->execute($server);
 $this->assertCollectionDoesNotExist($this->getCollectionName());
 }
 public function testDropNonexistentCollection() {
 $this->assertCollectionDoesNotExist($this->getCollectionName());
 $operation = new DropCollection($this->getDatabaseName(), $this->getCollectionName());
 $operation->execute($this->getPrimaryServer());
 }
 public function testSessionOption() {
 if (version_compare($this->getServerVersion(), '3.6.0', '<')) {
 $this->markTestSkipped('Sessions are not supported');
 }
 (new CommandObserver())->observe( function () {
 $operation = new DropCollection( $this->getDatabaseName(), $this->getCollectionName(), ['session' => $this->createSession()] );
 $operation->execute($this->getPrimaryServer());
 }
, function (array $event) {
 $this->assertObjectHasAttribute('lsid', $event['started']->getCommand());
 }
 );
 }
 private function assertCollectionDoesNotExist($collectionName) {
 $operation = new ListCollections($this->getDatabaseName());
 $collections = $operation->execute($this->getPrimaryServer());
 $foundCollection = null;
 foreach ($collections as $collection) {
 if ($collection->getName() === $collectionName) {
 $foundCollection = $collection;
 break;
 }
 }
 $this->assertNull($foundCollection, sprintf('Collection %s exists', $collectionName));
 }
 }
 