Limit grade to 255

1 files changed, 16 insertions, 1 deletions

diff --git a/rust/src/web.rs b/rust/src/web.rs
index c63268a..5be1cfe 100644
--- a/rust/src/web.rs
+++ b/rust/src/web.rs
@@ -146,7 +146,9 @@ impl Client {
                     .collect::<Vec<_>>()
                     .join("\n");
                 if actual == *expected {
-                    self.grade += 1;
+                    if self.grade < u8::MAX {
+                        self.grade += 1;
+                    }
                     self.delay = Duration::from_secs_f64(self.delay.as_secs_f64() * 0.8);
                     if self.delay.as_millis() < 500 {
                         self.delay = Duration::from_millis(500);
@@ -737,6 +739,19 @@ mod app_tests {
     }
 
     #[test]
+    async fn client_score_cannot_go_beyond_255() {
+        let mut client = client();
+        let expected = "1".to_string();
+        let response = Ok("1".to_string());
+
+        for _ in 0..256 {
+            client.check_result(&expected, &response);
+        }
+
+        assert_eq!(255, client.grade);
+    }
+
+    #[test]
     async fn client_decreases_delay_to_next_upon_successful_test() {
         let mut client = client();
         let expected = "1".to_string();