Add regular link tests for all the types.

src/types/object.rs

@@ -77,6 +77,9 @@ pub struct PlainText<'s> {
 #[derive(Debug, PartialEq)]
 pub struct RegularLink<'s> {
     pub source: &'s str,
+    pub link_type: &'s str,
+    pub path: &'s str,
+    pub raw_link: &'s str,
 }
 
 #[derive(Debug, PartialEq)]