test: add empty list test

crates/aiken-project/src/blueprint/mod.rs

@@ -140,7 +140,7 @@ impl From<&Config> for Preamble {
 }
 
 #[cfg(test)]
-mod test {
+mod tests {
     use super::*;
     use aiken_lang::builtins;
     use schema::{Data, Declaration, Items, Schema};

crates/aiken-project/src/blueprint/schema.rs

@@ -1033,7 +1033,7 @@ Here's the types I followed and that led me to this problem:
 }
 
 #[cfg(test)]
-pub mod test {
+pub mod tests {
     use super::*;
     use proptest::prelude::*;
     use serde_json::{self, json, Value};

crates/aiken-project/src/blueprint/validator.rs

@@ -177,7 +177,7 @@ impl Validator {
 }
 
 #[cfg(test)]
-mod test {
+mod tests {
     use assert_json_diff::assert_json_eq;
 
     use serde_json::{self, json};