Add tests for the content syntax parser

src/syntax/content/parser/token/linebreak.rs

@@ -1,4 +1,3 @@
-use std::fmt::Display;
 use crate::{
     syntax::content::{Parseable, parser::lexeme::Lexeme},
 };
@@ -19,9 +18,3 @@ impl Parseable for LineBreak {
         "\n".to_owned()
     }
 }
-
-impl Display for LineBreak {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(f, "Line Break")
-    }
-}