Performance: Keep collections and indexes between GridFS tests (#1421)

Author: GromNaN

tests/GridFS/BucketFunctionalTest.php

@@ -814,9 +814,22 @@ public function testUploadingFirstFileCreatesIndexes(): void
 
     public function testExistingIndexIsReused(): void
     {
+        // The collections may exist from other tests, ensure they are removed
+        // before and after to avoid potential conflicts.
+        $this->dropCollection($this->getDatabaseName(), 'fs.chunks');
+        $this->dropCollection($this->getDatabaseName(), 'fs.files');
+
+        // Create indexes with different numeric types before interacting with
+        // GridFS to assert that the library respects the existing indexes and
+        // does not attempt to create its own.
         $this->filesCollection->createIndex(['filename' => 1.0, 'uploadDate' => 1], ['name' => 'test']);
         $this->chunksCollection->createIndex(['files_id' => 1.0, 'n' => 1], ['name' => 'test', 'unique' => true]);
 
+        $this->assertIndexExists('fs.files', 'test');
+        $this->assertIndexExists('fs.chunks', 'test', function (IndexInfo $info): void {
+            $this->assertTrue($info->isUnique());
+        });
+
         $this->bucket->uploadFromStream('filename', self::createStream('foo'));
 
         $this->assertIndexNotExists($this->filesCollection->getCollectionName(), 'filename_1_uploadDate_1');

tests/GridFS/FunctionalTestCase.php

@@ -4,6 +4,7 @@
 
 use MongoDB\Collection;
 use MongoDB\GridFS\Bucket;
+use MongoDB\Operation\DropCollection;
 use MongoDB\Tests\FunctionalTestCase as BaseFunctionalTestCase;
 
 use function fopen;
@@ -28,10 +29,33 @@ public function setUp(): void
         parent::setUp();
 
         $this->bucket = new Bucket($this->manager, $this->getDatabaseName());
-        $this->bucket->drop();
 
-        $this->chunksCollection = $this->createCollection($this->getDatabaseName(), 'fs.chunks');
-        $this->filesCollection = $this->createCollection($this->getDatabaseName(), 'fs.files');
+        $this->chunksCollection = new Collection($this->manager, $this->getDatabaseName(), 'fs.chunks');
+        $this->filesCollection = new Collection($this->manager, $this->getDatabaseName(), 'fs.files');
+    }
+
+    public function tearDown(): void
+    {
+        $this->chunksCollection->deleteMany([]);
+        $this->filesCollection->deleteMany([]);
+
+        parent::tearDown();
+    }
+
+    /**
+     * The bucket's collections are created by the first test that runs and
+     * kept for all subsequent tests. This is done to avoid creating the
+     * collections and their indexes for each test, which would be slow.
+     *
+     * @beforeClass
+     * @afterClass
+     */
+    public static function dropCollectionsBeforeAfterClass(): void
+    {
+        $manager = static::createTestManager();
+
+        (new DropCollection(self::getDatabaseName(), 'fs.chunks'))->execute($manager->selectServer());
+        (new DropCollection(self::getDatabaseName(), 'fs.files'))->execute($manager->selectServer());
     }
 
     /**