Invert enable/disable MD5 tests

Author: GromNaN

tests/GridFS/BucketFunctionalTest.php

@@ -770,22 +770,23 @@ public function testUploadingAnEmptyFile(): void
 
         $expected = [
             'length' => 0,
-            'md5' => 'd41d8cd98f00b204e9800998ecf8427e',
         ];
 
         $this->assertSameDocument($expected, $fileDocument);
+        $this->assertArrayNotHasKey('md5', $fileDocument);
     }
 
-    public function testDisableMD5(): void
+    public function testEnableMD5(): void
     {
-        $options = ['disableMD5' => true];
+        $options = ['disableMD5' => false];
         $id = $this->bucket->uploadFromStream('filename', $this->createStream('data'), $options);
 
         $fileDocument = $this->filesCollection->findOne(
             ['_id' => $id],
         );
 
-        $this->assertArrayNotHasKey('md5', $fileDocument);
+        $this->assertArrayHasKey('md5', $fileDocument);
+        $this->assertSame('8d777f385d3dfec8815d20f7496026dc', $fileDocument['md5']);
     }
 
     public function testDisableMD5OptionInConstructor(): void