diff --git a/tests/meta.rs b/tests/meta.rs
index 6deb0bc..11d4e92 100644
--- a/tests/meta.rs
+++ b/tests/meta.rs
@@ -33,6 +33,32 @@ test!(
     "a {\n  color: feature-exists(at-error)\n}\n",
     "a {\n  color: true;\n}\n"
 );
+// Uncomment as more features are added
+// test!(
+//     feature_exists_global_variable_shadowing,
+//     "a {\n  color: feature-exists(global-variable-shadowing)\n}\n",
+//     "a {\n  color: true;\n}\n"
+// );
+// test!(
+//     feature_exists_extend_selector_pseudoclass,
+//     "a {\n  color: feature-exists(extend-selector-pseudoclass)\n}\n",
+//     "a {\n  color: true;\n}\n"
+// );
+// test!(
+//     feature_exists_units_level_3,
+//     "a {\n  color: feature-exists(units-level-3)\n}\n",
+//     "a {\n  color: true;\n}\n"
+// );
+// test!(
+//     feature_exists_custom_property,
+//     "a {\n  color: feature-exists(custom-property)\n}\n",
+//     "a {\n  color: true;\n}\n"
+// );
+test!(
+    feature_exists_nonsense,
+    "a {\n  color: feature-exists(foo)\n}\n",
+    "a {\n  color: false;\n}\n"
+);
 test!(
     feature_exists_at_error_named_arg,
     "a {\n  color: feature-exists($feature: at-error)\n}\n",