test(schema): Unit test for more feature name cases

Author: epage

src/cargo/util_schemas/restricted_names.rs

@@ -202,9 +202,12 @@ mod tests {
         assert!(validate_feature_name("feat_name").is_ok());
         assert!(validate_feature_name("foo.bar").is_ok());
 
+        assert!(validate_feature_name("").is_err());
         assert!(validate_feature_name("+foo").is_err());
         assert!(validate_feature_name("-foo").is_err());
         assert!(validate_feature_name(".foo").is_err());
+        assert!(validate_feature_name("dep:bar").is_err());
+        assert!(validate_feature_name("foo/bar").is_err());
         assert!(validate_feature_name("foo:bar").is_err());
         assert!(validate_feature_name("foo?").is_err());
         assert!(validate_feature_name("?foo").is_err());