Remove un-needed test.

src/ast/mod.rs

@@ -174,22 +174,6 @@ pub mod pretty_print {
 
 pub mod ast_node {
     include!(concat!(env!("OUT_DIR"), "/src/ast/ast_node.rs"));
-
-    #[cfg(test)]
-    mod tests {
-        use crate::ast::ast_node::AstNode;
-        use crate::ast::node::CompilationUnit;
-
-        fn get_cu() -> CompilationUnit {
-            todo!()
-        }
-
-        #[test]
-        fn simple() {
-            let cu = get_cu();
-            for child in cu.children() {}
-        }
-    }
 }
 
 pub mod walk {