diff --git a/SVSim.UnitTests/Controllers/FreeBattleControllerTests.cs b/SVSim.UnitTests/Controllers/FreeBattleControllerTests.cs
new file mode 100644
index 00000000..9603d539
--- /dev/null
+++ b/SVSim.UnitTests/Controllers/FreeBattleControllerTests.cs
@@ -0,0 +1,65 @@
+using System.Net.Http.Json;
+using System.Text.Json;
+using NUnit.Framework;
+using SVSim.Database.Enums;
+using SVSim.UnitTests.Infrastructure;
+
+namespace SVSim.UnitTests.Controllers;
+
+[TestFixture]
+public class FreeBattleControllerTests
+{
+    // BaseRequest fields (viewer_id / steam_id / steam_session_ticket) are required by the
+    // request DTOs — the ApiController's auto-validation rejects bodies missing them. We
+    // post placeholder values here; the TestAuthHandler injects the real viewer-id via the
+    // X-Test-Viewer-Id header set by CreateAuthenticatedClient, so these body values are
+    // ignored by auth.
+    private static readonly object DoMatchingBody = new
+    {
+        deck_no = 1,
+        need_init = 1,
+        log = 0,
+        viewer_id = "0",
+        steam_id = 0,
+        steam_session_ticket = "",
+    };
+
+    private static object FinishBody(int battleResult, int classId = 3) => new
+    {
+        battle_result = battleResult,
+        is_retire = 0,
+        recovery_data = "{}",
+        class_id = classId,
+        total_turn = 5,
+        viewer_id = "0",
+        steam_id = 0,
+        steam_session_ticket = "",
+    };
+
+    private static readonly object EmptyAuthedBody = new
+    {
+        viewer_id = "0",
+        steam_id = 0,
+        steam_session_ticket = "",
+    };
+
+    [Test]
+    public async Task DoMatching_unlimited_first_poll_returns_3002_RETRY_with_empty_node_server_url()
+    {
+        await using var factory = new SVSimTestFactory();
+        var viewerId = await factory.SeedViewerAsync();
+        await factory.SeedGlobalsAsync();
+        await factory.SeedDeckAsync(viewerId, Format.Unlimited, 1);
+        var client = factory.CreateAuthenticatedClient(viewerId);
+
+        var resp = await client.PostAsJsonAsync("/unlimited_free_battle/do_matching", DoMatchingBody);
+
+        Assert.That(resp.IsSuccessStatusCode, Is.True, $"Expected 2xx, got {resp.StatusCode}");
+        var raw = await resp.Content.ReadAsStringAsync();
+        using var doc = JsonDocument.Parse(raw);
+        var data = doc.RootElement;
+        Assert.That(data.GetProperty("matching_state").GetInt32(), Is.EqualTo(3002));
+        Assert.That(data.GetProperty("node_server_url").GetString(), Is.EqualTo(""),
+            "Empty string, not absent — Phase 2 fix pattern.");
+    }
+}