Update aes dependency

src/utils/string_utils.rs

@@ -30,4 +30,26 @@ pub fn apply_env_vars(val: &str) -> String {
     }
 
     val
+}
+
+#[cfg(test)]
+mod test {
+    use std::env;
+    use crate::utils::string_utils::apply_env_vars;
+
+    const VAR_ONE: &str = "VAR_ONE";
+    #[test]
+    fn test_apply_env_var() {
+        env::set_var(VAR_ONE, "good");
+        let src = format!("This is ${{{}}}", VAR_ONE);
+        assert_eq!("This is good", apply_env_vars(&src));
+    }
+
+    const VAR_INVALID: &str = "VAR_INV@LID";
+
+    #[test]
+    fn test_invalid_var_syntax() {
+        let src = format!("This is ${{{}}}", VAR_INVALID);
+        assert_eq!(src, apply_env_vars(&src));
+    }
 }