Added test (#10)

Reviewed-on: #10
Co-authored-by: kdeng00 <kundeng00@pm.me>
Co-committed-by: kdeng00 <kundeng00@pm.me>

src/lib.rs

@@ -1,17 +1,2 @@
 pub mod environment;
 pub mod keys;
-
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}