diff --git a/tests/tests.luau b/tests/tests.luau
index 7ce8b6d..bcf3aaf 100644
--- a/tests/tests.luau
+++ b/tests/tests.luau
@@ -5,7 +5,7 @@ local compression = require("../lib/compression")
 local types = require("../lib/types")
 
 
-function testFolder(callback: (file: string, opts: types.opts) -> boolean, opts: types.opts, folderPath: string): {boolean}
+function testFolder(callback: (file: string, opts: types.opts) -> string | boolean, opts: types.opts, folderPath: string): {boolean}
     local results = {}
     local folder = fs.readDir(folderPath)
     for _, file in pairs(folder) do