<?php
 namespace MongoDB\Tests\Operation;
 use MongoDB\Model\DatabaseInfo;
 use MongoDB\Model\DatabaseInfoIterator;
 use MongoDB\Operation\InsertOne;
 use MongoDB\Operation\ListDatabases;
 use MongoDB\Tests\CommandObserver;
 use function version_compare;
 class ListDatabasesFunctionalTest extends FunctionalTestCase {
 public function testListDatabases() {
 $server = $this->getPrimaryServer();
 $insertOne = new InsertOne($this->getDatabaseName(), $this->getCollectionName(), ['x' => 1]);
 $writeResult = $insertOne->execute($server);
 $this->assertEquals(1, $writeResult->getInsertedCount());
 $operation = new ListDatabases();
 $databases = $operation->execute($server);
 $this->assertInstanceOf(DatabaseInfoIterator::class, $databases);
 foreach ($databases as $database) {
 $this->assertInstanceOf(DatabaseInfo::class, $database);
 }
 }
 public function testFilterOption() {
 if (version_compare($this->getServerVersion(), '3.6.0', '<')) {
 $this->markTestSkipped('listDatabase command "filter" option is not supported');
 }
 $server = $this->getPrimaryServer();
 $insertOne = new InsertOne($this->getDatabaseName(), $this->getCollectionName(), ['x' => 1]);
 $writeResult = $insertOne->execute($server);
 $this->assertEquals(1, $writeResult->getInsertedCount());
 $operation = new ListDatabases(['filter' => ['name' => $this->getDatabaseName()]]);
 $databases = $operation->execute($server);
 $this->assertInstanceOf(DatabaseInfoIterator::class, $databases);
 $this->assertCount(1, $databases);
 foreach ($databases as $database) {
 $this->assertInstanceOf(DatabaseInfo::class, $database);
 $this->assertEquals($this->getDatabaseName(), $database->getName());
 }
 }
 public function testSessionOption() {
 if (version_compare($this->getServerVersion(), '3.6.0', '<')) {
 $this->markTestSkipped('Sessions are not supported');
 }
 (new CommandObserver())->observe( function () {
 $operation = new ListDatabases( ['session' => $this->createSession()] );
 $operation->execute($this->getPrimaryServer());
 }
, function (array $event) {
 $this->assertObjectHasAttribute('lsid', $event['started']->getCommand());
 }
 );
 }
 }
 