diff --git a/lib/rules/media-feature-name-value-no-unknown/__tests__/index.js b/lib/rules/media-feature-name-value-no-unknown/__tests__/index.js
index a94dd5ae87..5a6f740bde 100644
--- a/lib/rules/media-feature-name-value-no-unknown/__tests__/index.js
+++ b/lib/rules/media-feature-name-value-no-unknown/__tests__/index.js
@@ -75,6 +75,10 @@ testRule({
 			code: '@media (-webkit-hover: -webkit-hover) {}',
 			description: 'Double vendor prefixes when valid',
 		},
+		{
+			code: '@media (foo: 100px) {}',
+			description: 'Unknown media feature',
+		},
 	],
 
 	reject: [