Wait 1 ms between file inserts to ensure revisions have different date for sorting

Author: GromNaN

tests/GridFS/StreamWrapperFunctionalTest.php

@@ -28,6 +28,7 @@
 use function stream_context_create;
 use function stream_get_contents;
 use function time;
+use function usleep;
 
 use const SEEK_CUR;
 use const SEEK_END;
@@ -289,8 +290,11 @@ public function testOpenSpecificRevision(): void
 
         $filename = 'gridfs://bucket/path/to/filename';
 
+        // Insert 3 revisions, wait 1ms between each to ensure they have different uploadDate
         file_put_contents($filename, 'version 0');
+        usleep(1000);
         file_put_contents($filename, 'version 1');
+        usleep(1000);
         file_put_contents($filename, 'version 2');
 
         $context = stream_context_create([