test(free-battle): literal-prod-JSON parity for /do_matching

SVSim.UnitTests/Controllers/FreeBattleControllerTests.cs

@@ -169,4 +169,42 @@ public class FreeBattleControllerTests
         Assert.That(doc.RootElement.EnumerateObject().MoveNext(), Is.False,
             "Body should be {} — defensive no-op for dead URL.");
     }
+
+    [Test]
+    public async Task DoMatching_unlimited_accepts_literal_prod_request_keys()
+    {
+        await using var factory = new SVSimTestFactory();
+        var viewerId = await factory.SeedViewerAsync();
+        await factory.SeedGlobalsAsync();
+        await factory.SeedDeckAsync(viewerId, Format.Unlimited, 7);
+        var client = factory.CreateAuthenticatedClient(viewerId);
+
+        // Body shape lifted from a real prod capture (traffic_prod_ranked_unlimited.ndjson
+        // line 73). Exercises every wire key the client emits on this URL.
+        var literalProdBody = new
+        {
+            deck_no = 7,
+            need_init = 0,
+            log = 2,
+            excluded_field_id_list = Array.Empty<long>(),
+            use_stage_select = 1,
+            is_default_skin = 0,
+            // Auth placeholders — TestAuthHandler injects the real viewer-id via header.
+            viewer_id = "0",
+            steam_id = 0,
+            steam_session_ticket = "",
+        };
+
+        var resp = await client.PostAsJsonAsync("/unlimited_free_battle/do_matching", literalProdBody);
+
+        Assert.That(resp.IsSuccessStatusCode, Is.True, $"Expected 2xx, got {resp.StatusCode}");
+        using var doc = JsonDocument.Parse(await resp.Content.ReadAsStringAsync());
+        var data = doc.RootElement;
+        // First poll on an empty queue → 3002 RETRY.
+        Assert.That(data.GetProperty("matching_state").GetInt32(), Is.EqualTo(3002));
+        Assert.That(data.GetProperty("node_server_url").GetString(), Is.EqualTo(""));
+        // timeout_period + retry_period are always present.
+        Assert.That(data.TryGetProperty("timeout_period", out _), Is.True);
+        Assert.That(data.TryGetProperty("retry_period", out _), Is.True);
+    }
 }