From 2f90b5a33f223e14a1a1cbf25d4def381b9b9547 Mon Sep 17 00:00:00 2001
From: Nafies Luthfi <nafiesl@gmail.com>
Date: Sun, 6 Jan 2019 23:44:23 +0800
Subject: [PATCH] Make all tests passed

---
 tests/TestCase.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/TestCase.php b/tests/TestCase.php
index 8ad9de8..e6f1e4b 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -33,7 +33,7 @@ abstract class TestCase extends BaseTestCase
         return $user;
     }
 
-    protected function assertFileExistsThenDelete($filePath, $message = null)
+    protected function assertFileExistsThenDelete($filePath, $message = '')
     {
         $this->assertTrue(file_exists($filePath), $message);