feat: execute full-repo remaining parity closure plan

tests/NATS.Server.Tests/Routes/RouteAccountScopedTests.cs

@@ -0,0 +1,14 @@
+using NATS.Server.Routes;
+
+namespace NATS.Server.Tests;
+
+public class RouteAccountScopedTests
+{
+    [Fact]
+    public void Route_connect_info_includes_account_scope()
+    {
+        var json = RouteConnection.BuildConnectInfoJson("S1", ["A"], "topology-v1");
+        json.ShouldContain("\"accounts\":[\"A\"]");
+        json.ShouldContain("\"topology\":\"topology-v1\"");
+    }
+}

tests/NATS.Server.Tests/Routes/RouteCompressionTests.cs

@@ -0,0 +1,16 @@
+using System.Text;
+using NATS.Server.Routes;
+
+namespace NATS.Server.Tests;
+
+public class RouteCompressionTests
+{
+    [Fact]
+    public void Route_payload_round_trips_through_compression_codec()
+    {
+        var payload = Encoding.UTF8.GetBytes(new string('x', 512));
+        var compressed = RouteCompressionCodec.Compress(payload);
+        var restored = RouteCompressionCodec.Decompress(compressed);
+        restored.ShouldBe(payload);
+    }
+}

tests/NATS.Server.Tests/Routes/RouteTopologyGossipTests.cs

@@ -0,0 +1,25 @@
+using Microsoft.Extensions.Logging.Abstractions;
+using NATS.Server.Configuration;
+using NATS.Server.Routes;
+
+namespace NATS.Server.Tests;
+
+public class RouteTopologyGossipTests
+{
+    [Fact]
+    public void Topology_snapshot_reports_server_and_route_counts()
+    {
+        var manager = new RouteManager(
+            new ClusterOptions { Host = "127.0.0.1", Port = 0 },
+            new ServerStats(),
+            "S1",
+            _ => { },
+            _ => { },
+            NullLogger<RouteManager>.Instance);
+
+        var snapshot = manager.BuildTopologySnapshot();
+        snapshot.ServerId.ShouldBe("S1");
+        snapshot.RouteCount.ShouldBe(0);
+        snapshot.ConnectedServerIds.ShouldBeEmpty();
+    }
+}