test: add empty list test

crates/aiken-lang/src/parser/expr/list.rs

@@ -27,3 +27,16 @@ pub fn parser(
             tail,
         })
 }
+
+#[cfg(test)]
+mod tests {
+
+    use chumsky::Parser;
+
+    use crate::assert_expr;
+
+    #[test]
+    fn empty_list() {
+        assert_expr!("[]");
+    }
+}

crates/aiken-lang/src/parser/expr/snapshots/empty_list.snap

@@ -0,0 +1,9 @@
+---
+source: crates/aiken-lang/src/parser/expr/list.rs
+description: "Code:\n\n[]"
+---
+List {
+    location: 0..2,
+    elements: [],
+    tail: None,
+}