From a6e8088526195e809aa58e7d30e27bf99efa2cf7 Mon Sep 17 00:00:00 2001
From: Joseph Doherty <dohejw01@gmail.com>
Date: Wed, 25 Feb 2026 11:35:21 -0500
Subject: [PATCH] test: verify internal client kinds (Gap 5.9)

---
 tests/NATS.Server.Tests/ClientKindTests.cs | 50 ++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 tests/NATS.Server.Tests/ClientKindTests.cs

diff --git a/tests/NATS.Server.Tests/ClientKindTests.cs b/tests/NATS.Server.Tests/ClientKindTests.cs
new file mode 100644
index 0000000..bc006cc
--- /dev/null
+++ b/tests/NATS.Server.Tests/ClientKindTests.cs
@@ -0,0 +1,50 @@
+// Tests for ClientKind enum and IsInternal() extension method.
+// Go reference: client.go:45-65 (client kind constants and isInternal check)
+
+using NATS.Server;
+using Shouldly;
+
+namespace NATS.Server.Tests;
+
+public class ClientKindTests
+{
+    [Fact]
+    public void Client_is_not_internal() =>
+        ClientKind.Client.IsInternal().ShouldBeFalse();
+
+    [Fact]
+    public void Router_is_not_internal() =>
+        ClientKind.Router.IsInternal().ShouldBeFalse();
+
+    [Fact]
+    public void Gateway_is_not_internal() =>
+        ClientKind.Gateway.IsInternal().ShouldBeFalse();
+
+    [Fact]
+    public void Leaf_is_not_internal() =>
+        ClientKind.Leaf.IsInternal().ShouldBeFalse();
+
+    [Fact]
+    public void System_is_internal() =>
+        ClientKind.System.IsInternal().ShouldBeTrue();
+
+    [Fact]
+    public void JetStream_is_internal() =>
+        ClientKind.JetStream.IsInternal().ShouldBeTrue();
+
+    [Fact]
+    public void Account_is_internal() =>
+        ClientKind.Account.IsInternal().ShouldBeTrue();
+
+    [Fact]
+    public void All_kinds_defined() =>
+        Enum.GetValues<ClientKind>().Length.ShouldBe(7);
+
+    [Fact]
+    public void Internal_kinds_count_is_three() =>
+        Enum.GetValues<ClientKind>().Count(k => k.IsInternal()).ShouldBe(3);
+
+    [Fact]
+    public void External_kinds_count_is_four() =>
+        Enum.GetValues<ClientKind>().Count(k => !k.IsInternal()).ShouldBe(4);
+}