<?php
 namespace MongoDB\Tests\Operation;
 use MongoDB\Model\IndexInfo;
 use MongoDB\Model\IndexInfoIterator;
 use MongoDB\Operation\DropCollection;
 use MongoDB\Operation\InsertOne;
 use MongoDB\Operation\ListIndexes;
 use MongoDB\Tests\CommandObserver;
 use function version_compare;
 class ListIndexesFunctionalTest extends FunctionalTestCase {
 public function testListIndexesForNewlyCreatedCollection() {
 $operation = new DropCollection($this->getDatabaseName(), $this->getCollectionName());
 $operation->execute($this->getPrimaryServer());
 $insertOne = new InsertOne($this->getDatabaseName(), $this->getCollectionName(), ['x' => 1]);
 $writeResult = $insertOne->execute($this->getPrimaryServer());
 $this->assertEquals(1, $writeResult->getInsertedCount());
 $operation = new ListIndexes($this->getDatabaseName(), $this->getCollectionName());
 $indexes = $operation->execute($this->getPrimaryServer());
 $this->assertInstanceOf(IndexInfoIterator::class, $indexes);
 $this->assertCount(1, $indexes);
 foreach ($indexes as $index) {
 $this->assertInstanceOf(IndexInfo::class, $index);
 $this->assertEquals(['_id' => 1], $index->getKey());
 }
 }
 public function testListIndexesForNonexistentCollection() {
 $operation = new DropCollection($this->getDatabaseName(), $this->getCollectionName());
 $operation->execute($this->getPrimaryServer());
 $operation = new ListIndexes($this->getDatabaseName(), $this->getCollectionName());
 $indexes = $operation->execute($this->getPrimaryServer());
 $this->assertCount(0, $indexes);
 }
 public function testSessionOption() {
 if (version_compare($this->getServerVersion(), '3.6.0', '<')) {
 $this->markTestSkipped('Sessions are not supported');
 }
 (new CommandObserver())->observe( function () {
 $operation = new ListIndexes( $this->getDatabaseName(), $this->getCollectionName(), ['session' => $this->createSession()] );
 $operation->execute($this->getPrimaryServer());
 }
, function (array $event) {
 $this->assertObjectHasAttribute('lsid', $event['started']->getCommand());
 }
 );
 }
 }
 