Fix tests for renaming collection to different database

Author: tanlisu

tests/Collection/CollectionFunctionalTest.php

@@ -5,6 +5,7 @@
 use Closure;
 use MongoDB\BSON\Javascript;
 use MongoDB\Collection;
+use MongoDB\Database;
 use MongoDB\Driver\BulkWrite;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
@@ -352,8 +353,9 @@ public function testRenameToSameDatabase(): void
 
     public function testRenameToDifferentDatabase(): void
     {
-        $toCollectionName = $this->getCollectionName() . '.renamed';
         $toDatabaseName = $this->getDatabaseName() . '_renamed';
+        $toCollectionName = $this->getCollectionName() . '.renamed';
+        $toDatabase = new Database($this->manager, $toDatabaseName);
         $toCollection = new Collection($this->manager, $toDatabaseName, $toCollectionName);
 
         $writeResult = $this->collection->insertOne(['_id' => 1]);
@@ -366,7 +368,9 @@ public function testRenameToDifferentDatabase(): void
 
         $document = $toCollection->findOne();
         $this->assertSameDocument(['_id' => 1], $document);
+
         $toCollection->drop();
+        $toDatabase->drop();
     }
 
     public function testWithOptionsInheritsOptions(): void

tests/Database/DatabaseFunctionalTest.php

@@ -240,8 +240,9 @@ public function testRenameCollectionToSameDatabase(): void
 
     public function testRenameCollectionToDifferentDatabase(): void
     {
-        $toCollectionName = $this->getCollectionName() . '.renamed';
         $toDatabaseName = $this->getDatabaseName() . '_renamed';
+        $toCollectionName = $this->getCollectionName() . '.renamed';
+        $toDatabase = new Database($this->manager, $toDatabaseName);
         $toCollection = new Collection($this->manager, $toDatabaseName, $toCollectionName);
 
         $bulkWrite = new BulkWrite();
@@ -262,7 +263,9 @@ public function testRenameCollectionToDifferentDatabase(): void
 
         $document = $toCollection->findOne();
         $this->assertSameDocument(['_id' => 1], $document);
+
         $toCollection->drop();
+        $toDatabase->drop();
     }
 
     public function testSelectCollectionInheritsOptions(): void