From 40116289226da091144b0464cefefa108c6e8ffb Mon Sep 17 00:00:00 2001
From: Lucas Hedding <heddn@users.noreply.github.com>
Date: Wed, 16 Feb 2022 14:18:31 -0600
Subject: [PATCH] Update DrushTestTrait.php (#5076)

If `$value` is optional, we need to allow null values.
---
 src/TestTraits/DrushTestTrait.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/TestTraits/DrushTestTrait.php b/src/TestTraits/DrushTestTrait.php
index e4dd25cbef..dc66833ed4 100644
--- a/src/TestTraits/DrushTestTrait.php
+++ b/src/TestTraits/DrushTestTrait.php
@@ -90,7 +90,7 @@ public function drush($command, array $args = [], array $options = [], $site_spe
      * @param string $value The option value (or empty)
      * @return string
      */
-    protected function convertKeyValueToFlag(string $key, string $value)
+    protected function convertKeyValueToFlag(string $key, ?string $value)
     {
         if (!isset($value)) {
             return "--$key";