diff --git a/src/builtins/mod.rs b/src/builtins/mod.rs
index 56adceb..9d78357 100644
--- a/src/builtins/mod.rs
+++ b/src/builtins/mod.rs
@@ -21,6 +21,11 @@ pub fn execute_builtin(keyword: &str, args: &[&str]) -> Result<(), ShellError> {
 mod tests {
     use super::*;
 
+    #[test]
+    fn test_is_builtin_exit() {
+        assert_eq!(is_builtin("exit"), true);
+    }
+
     #[test]
     fn test_is_builtin_cd() {
         assert_eq!(is_builtin("cd"), true);