test: add empty list test

crates/uplc/src/flat.rs

@@ -808,7 +808,7 @@ pub fn decode_constant_tag(d: &mut Decoder) -> Result<u8, de::Error> {
 }
 
 #[cfg(test)]
-mod test {
+mod tests {
     use super::{Constant, Program, Term};
     use crate::{
         ast::{DeBruijn, Name, Type},

crates/uplc/src/machine/cost_model.rs

@@ -3213,7 +3213,7 @@ impl TryFrom<u8> for StepKind {
 }
 
 #[cfg(test)]
-mod test {
+mod tests {
     use super::*;
     use pretty_assertions::assert_eq;
 

crates/uplc/src/optimize/shrinker.rs

@@ -503,7 +503,7 @@ fn replace_identity_usage(term: &Term<Name>, original: Rc<Name>) -> Term<Name> {
 }
 
 #[cfg(test)]
-mod test {
+mod tests {
 
     use pallas_primitives::babbage::{BigInt, PlutusData};
     use pretty_assertions::assert_eq;

crates/uplc/src/parser.rs

@@ -282,7 +282,7 @@ peg::parser! {
 }
 
 #[cfg(test)]
-mod test {
+mod tests {
     use num_bigint::BigInt;
 
     use crate::ast::{Constant, Name, Program, Term, Type, Unique};