Carrier negotiation + WebSocket lifecycle

Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>

src/web/session/backend_tests.rs

@@ -206,6 +206,58 @@ async fn open_without_data_does_not_start_the_inner_handshake_timeout() {
     }
 }
 
+#[tokio::test(start_paused = true)]
+async fn silent_open_does_not_consume_generation_connection_capacity() {
+    let runtime = test_runtime(WebCarrier::Https, 1);
+    let available = runtime.generation.max_connections.available_permits();
+
+    assert_eq!(runtime.process_frame(1, 1, FrameType::Open, &[]), Ok(1));
+    settle_tasks().await;
+
+    assert_eq!(
+        runtime.generation.max_connections.available_permits(),
+        available
+    );
+
+    assert_eq!(runtime.process_frame(1, 2, FrameType::Data, &[0x5a]), Ok(2));
+    settle_tasks().await;
+    assert_eq!(
+        runtime.generation.max_connections.available_permits(),
+        available - 1
+    );
+
+    runtime.shutdown().await;
+}
+
+#[tokio::test(start_paused = true)]
+async fn first_inner_byte_fails_closed_when_connection_capacity_is_exhausted() {
+    let runtime = test_runtime(WebCarrier::Https, 1);
+    let capacity = runtime.generation.max_connections.available_permits();
+    let permit = runtime
+        .generation
+        .max_connections
+        .clone()
+        .try_acquire_many_owned(capacity as u32)
+        .unwrap();
+
+    assert_eq!(runtime.process_frame(1, 1, FrameType::Open, &[]), Ok(1));
+    settle_tasks().await;
+    assert!(runtime.session.state.lock().streams.contains_key(&1));
+
+    assert_eq!(runtime.process_frame(1, 2, FrameType::Data, &[0x5a]), Ok(2));
+    settle_tasks().await;
+
+    assert!(!runtime.session.state.lock().streams.contains_key(&1));
+    assert_eq!(runtime.generation.max_connections.available_permits(), 0);
+
+    drop(permit);
+    assert_eq!(
+        runtime.generation.max_connections.available_permits(),
+        capacity
+    );
+    runtime.shutdown().await;
+}
+
 #[tokio::test(start_paused = true)]
 async fn the_first_inner_byte_starts_the_handshake_timeout() {
     let runtime = test_runtime(WebCarrier::Https, 1);