tests: rework the actually useful tests to live in the integration crate

crates/irtt-server/tests/session_behavior.rs

@@ -0,0 +1,118 @@
+use std::{net::SocketAddr, time::Duration};
+
+use irtt_proto::{decode_echo_reply, decode_open_reply, encode_request, Params, RequestToEncode};
+use irtt_server::{ServerConfig, ServerCore};
+
+// Admission, authentication, endpoint ownership and capacity are checked through
+// the public packet interface, with actual OS-generated session tokens.
+#[test]
+fn authenticated_sessions_are_bounded_and_owned_by_the_opening_endpoint() {
+    let key = b"session-behavior";
+    let peer: SocketAddr = "127.0.0.1:40000".parse().unwrap();
+    let other: SocketAddr = "127.0.0.1:40001".parse().unwrap();
+    let mut server = ServerCore::new(
+        ServerConfig::default()
+            .with_hmac_key(key)
+            .with_max_sessions(1)
+            .with_min_send_interval(Duration::ZERO),
+    );
+    let params = Params {
+        received_stats: irtt_proto::ReceivedStats::Both,
+        ..Params::with_protocol_defaults()
+    };
+    let open = encode_request(
+        RequestToEncode::Open {
+            params: &params,
+            no_test: false,
+        },
+        Some(key),
+    )
+    .unwrap();
+    let unauthenticated = encode_request(
+        RequestToEncode::Open {
+            params: &params,
+            no_test: false,
+        },
+        None,
+    )
+    .unwrap();
+    for packet in [
+        &[][..],
+        &[0; 16][..],
+        &open[..open.len() - 1],
+        &unauthenticated,
+    ] {
+        assert!(server.handle_datagram(peer, packet).unwrap().is_none());
+        assert_eq!(server.session_count(), 0);
+    }
+    let reply = server.handle_datagram(peer, &open).unwrap().unwrap();
+    let opened = decode_open_reply(reply.bytes(), Some(key)).unwrap();
+    assert_ne!(opened.token, 0);
+    assert!(server.handle_datagram(other, &open).unwrap().is_none());
+    assert_eq!(server.session_count(), 1);
+    let echo = encode_request(
+        RequestToEncode::Echo {
+            token: opened.token,
+            sequence: 0,
+            params: &opened.params,
+            payload: &[],
+        },
+        Some(key),
+    )
+    .unwrap();
+    let close = encode_request(
+        RequestToEncode::Close {
+            token: opened.token,
+        },
+        Some(key),
+    )
+    .unwrap();
+    assert!(server.handle_datagram(other, &echo).unwrap().is_none());
+    assert!(server.handle_datagram(other, &close).unwrap().is_none());
+    let mut corrupted = echo.clone();
+    corrupted[4] ^= 1;
+    assert!(server.handle_datagram(peer, &corrupted).unwrap().is_none());
+    let reply = server.handle_datagram(peer, &echo).unwrap().unwrap();
+    let echoed = decode_echo_reply(reply.bytes(), &opened.params, Some(key)).unwrap();
+    assert_eq!(echoed.sequence, 0);
+    assert_eq!(echoed.recv_count, Some(1));
+    assert!(server.handle_datagram(peer, &close).unwrap().is_none());
+    assert_eq!(server.session_count(), 0);
+    assert!(server.handle_datagram(peer, &echo).unwrap().is_none());
+    assert!(server.handle_datagram(other, &open).unwrap().is_some());
+}
+
+// Zero allowance and zero idle lifetime expose the boundary behavior directly,
+// without scripting clock reads or inspecting session/rate representations.
+#[test]
+fn zero_burst_and_zero_idle_timeout_silently_refuse_echoes() {
+    let peer: SocketAddr = "127.0.0.1:40000".parse().unwrap();
+    for config in [
+        ServerConfig::default().with_burst_allowance(0),
+        ServerConfig::default().with_idle_timeout(Duration::ZERO),
+    ] {
+        let mut server = ServerCore::new(config);
+        let params = Params::with_protocol_defaults();
+        let open = encode_request(
+            RequestToEncode::Open {
+                params: &params,
+                no_test: false,
+            },
+            None,
+        )
+        .unwrap();
+        let reply = server.handle_datagram(peer, &open).unwrap().unwrap();
+        let opened = decode_open_reply(reply.bytes(), None).unwrap();
+        let echo = encode_request(
+            RequestToEncode::Echo {
+                token: opened.token,
+                sequence: 0,
+                params: &opened.params,
+                payload: &[],
+            },
+            None,
+        )
+        .unwrap();
+        assert!(server.handle_datagram(peer, &echo).unwrap().is_none());
+    }
+}