diff --git a/src/core/tests/Deal.Tests.Unit/Support/TelegramIngressTestHost.cs b/src/core/tests/Deal.Tests.Unit/Support/TelegramIngressTestHost.cs
index 6548585..84075ae 100644
--- a/src/core/tests/Deal.Tests.Unit/Support/TelegramIngressTestHost.cs
+++ b/src/core/tests/Deal.Tests.Unit/Support/TelegramIngressTestHost.cs
@@ -18,6 +18,7 @@ using Grpc.Net.Client;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Server.Kestrel.Core;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Diagnostics.HealthChecks;
 
@@ -57,15 +58,17 @@ internal static class TelegramIngressTestHost
         Func<GrpcChannel, Task> scenario,
         RateLimitOptions? rateLimitOptions = null)
     {
-        string? originalToken = Environment.GetEnvironmentVariable(ServiceTokenEnvKey);
-        Environment.SetEnvironmentVariable(ServiceTokenEnvKey, serviceToken);
-
         WebApplication? app = null;
         GrpcChannel? channel = null;
         try
         {
             int port = TestPort.Allocate();
             WebApplicationBuilder builder = WebApplication.CreateBuilder();
+            // Токен ингресса задаётся конфигурацией хоста (в приоритете над env) — без мутации процесса.
+            builder.Configuration.AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                [ServiceTokenEnvKey] = serviceToken,
+            });
             builder.WebHost.ConfigureKestrel(kestrel =>
                 kestrel.Listen(IPAddress.Loopback, port, listen => listen.Protocols = HttpProtocols.Http2));
 
@@ -131,8 +134,6 @@ internal static class TelegramIngressTestHost
                 await app.StopAsync();
                 await app.DisposeAsync();
             }
-
-            Environment.SetEnvironmentVariable(ServiceTokenEnvKey, originalToken);
         }
     }