feat(tcp): add a test for (set|get)_congestion_control()

Signed-off-by: Yuuki Takano <[email protected]>

src/socket/tcp.rs

@@ -555,8 +555,8 @@ impl<'a> Socket<'a> {
     /// be more efficient and fair compared to `CongestionControl::Reno`.
     /// It is the default choice for Linux, Windows, and macOS.
     ///
-    /// `CongestionControl::Reno` is a classic congestion control algorithm valued for its simplicity and
-    /// widespread support. Despite having a lower algorithmic complexity than `Cubic`,
+    /// `CongestionControl::Reno` is a classic congestion control algorithm valued for its simplicity.
+    /// Despite having a lower algorithmic complexity than `Cubic`,
     /// it is less efficient in terms of bandwidth usage.
     pub fn set_congestion_control(&mut self, congestion_control: CongestionControl) {
         use congestion_controller::*;
@@ -7378,4 +7378,18 @@ mod test {
             assert_eq!(r.retransmission_timeout(), Duration::from_millis(rto));
         }
     }
+
+    #[test]
+    fn test_set_get_congestion_control() {
+        let mut s = socket_established();
+
+        s.set_congestion_control(CongestionControl::Reno);
+        assert_eq!(s.get_congestion_control(), CongestionControl::Reno);
+
+        s.set_congestion_control(CongestionControl::Cubic);
+        assert_eq!(s.get_congestion_control(), CongestionControl::Cubic);
+
+        s.set_congestion_control(CongestionControl::None);
+        assert_eq!(s.get_congestion_control(), CongestionControl::None);
+    }
 }