Null should not be preserved
@@ -10,7 +10,7 @@ test!(space_list_number, "a {\n color: 1 2 3;\n}\n");
test!(comma_space_list_number, "a {\n color: 1 1, 2 2, 3 3;\n}\n");
test!(preserves_keyword_true, "a {\n color: true;\n}\n");
test!(preserves_keyword_false, "a {\n color: false;\n}\n");
-test!(preserves_keyword_null, "a {\n color: null;\n}\n");
+test!(does_not_preserve_keyword_null, "a {\n color: null;\n}\n", "");
test!(preserves_keyword_auto, "a {\n color: auto;\n}\n");
test!(preserves_keyword_initial, "a {\n color: initial;\n}\n");
test!(preserves_keyword_infinity, "a {\n color: infinity;\n}\n");
