Added resumable upload tests

src/Api.php

@@ -446,6 +446,8 @@ class Api
     }
 
     /**
+     * Uploads a file to the specified URL.
+     *
      * @param string $uploadUrl The target URL for the upload.
      * @param resource $fileHandle A stream resource pointing to the file.
      * @param string $fileName The desired file name for the upload.

src/Client.php

@@ -181,7 +181,9 @@ final readonly class Client implements ClientApiInterface
         while (!feof($fileResource)) {
             $chunk = fread($fileResource, $chunkSize);
             if ($chunk === false) {
+                // @codeCoverageIgnoreStart
                 throw new RuntimeException('Failed to read chunk from file stream.');
+                // @codeCoverageIgnoreEnd
             }
 
             $chunkLength = strlen($chunk);