diff --git a/tests/phpunit/includes/class-wp-test-stream.php b/tests/phpunit/includes/class-wp-test-stream.php
index f489b2bdcc..78ce816f69 100644
--- a/tests/phpunit/includes/class-wp-test-stream.php
+++ b/tests/phpunit/includes/class-wp-test-stream.php
@@ -30,6 +30,15 @@ class WP_Test_Stream {
 	public $bucket;
 	public $data_ref;
 
+	/**
+	 * The current context.
+	 *
+	 * @link https://www.php.net/manual/en/class.streamwrapper.php
+	 *
+	 * @var resource|null
+	 */
+	public $context;
+
 	/**
 	 * Initializes internal state for reading the given URL.
 	 *