diff --git a/tests/legacy/framework/traits/trait-wc-rest-api-complex-meta.php b/tests/legacy/framework/traits/trait-wc-rest-api-complex-meta.php
index f16145be243..1b51c8b2531 100644
--- a/tests/legacy/framework/traits/trait-wc-rest-api-complex-meta.php
+++ b/tests/legacy/framework/traits/trait-wc-rest-api-complex-meta.php
@@ -32,6 +32,10 @@ trait WC_REST_API_Complex_Meta {
 			'key' => 'array_meta',
 			'value' => array( 1, 2, 'string' ),
 		),
+		array(
+			'key' => 'null_meta',
+			'value' => 'null',
+		),
 		array(
 			'key' => 'object_meta',
 			'value' => array(