fix(ci): stabilize integration auth setup with fake email config

tests/CleanArchitecture.IntegrationTests/Controllers/IdentityIntegrationTests.cs

@@ -5,6 +5,7 @@
 using System.Text.RegularExpressions;
 using FluentAssertions;
 using CleanArchitecture.IntegrationTests.Infrastructure;
+using Identity.Application.Services;
 using Identity.Infrastructure.Services;
 using Microsoft.AspNetCore.WebUtilities;
 
@@ -49,7 +50,7 @@ private static AuthPayload ExtractAuthPayload(string jsonContent)
 
     private static (string userId, string token) ExtractUserIdAndTokenFromLastEmail(string recipient)
     {
-        var message = FakeEmailService.GetLastMessage(recipient);
+        var message = WaitForLastMessage(recipient, timeoutMs: 3000, pollMs: 100);
         message.Should().NotBeNull("Expected an email to be sent");
 
         var link = ExtractFirstLink(message!.TextBody);
@@ -65,6 +66,23 @@ private static (string userId, string token) ExtractUserIdAndTokenFromLastEmail(
         return (userId, token);
     }
 
+    private static EmailMessage? WaitForLastMessage(string recipient, int timeoutMs, int pollMs)
+    {
+        var start = DateTime.UtcNow;
+        while ((DateTime.UtcNow - start).TotalMilliseconds < timeoutMs)
+        {
+            var message = FakeEmailService.GetLastMessage(recipient);
+            if (message != null)
+            {
+                return message;
+            }
+
+            Thread.Sleep(pollMs);
+        }
+
+        return null;
+    }
+
     private static string ExtractFirstLink(string text)
     {
         var match = Regex.Match(text, @"https?://\S+");

tests/CleanArchitecture.IntegrationTests/Infrastructure/AuthenticationTestHelper.cs

@@ -3,6 +3,7 @@
 using System.Text.Json;
 using System.Text.RegularExpressions;
 using FluentAssertions;
+using Identity.Application.Services;
 using Identity.Infrastructure.Services;
 using Microsoft.AspNetCore.WebUtilities;
 
@@ -69,7 +70,7 @@ public static async Task<string> AuthenticateAsync(HttpClient client)
 
     private static (string userId, string token) ExtractUserIdAndTokenFromLastEmail(string recipient)
     {
-        var message = FakeEmailService.GetLastMessage(recipient);
+        var message = WaitForLastMessage(recipient, timeoutMs: 3000, pollMs: 100);
         message.Should().NotBeNull("Expected an email to be sent");
 
         var link = ExtractFirstLink(message!.TextBody);
@@ -85,6 +86,23 @@ private static (string userId, string token) ExtractUserIdAndTokenFromLastEmail(
         return (userId, token);
     }
 
+    private static EmailMessage? WaitForLastMessage(string recipient, int timeoutMs, int pollMs)
+    {
+        var start = DateTime.UtcNow;
+        while ((DateTime.UtcNow - start).TotalMilliseconds < timeoutMs)
+        {
+            var message = FakeEmailService.GetLastMessage(recipient);
+            if (message != null)
+            {
+                return message;
+            }
+
+            Thread.Sleep(pollMs);
+        }
+
+        return null;
+    }
+
     private static string ExtractFirstLink(string text)
     {
         var match = Regex.Match(text, @"https?://\S+");

tests/CleanArchitecture.IntegrationTests/Infrastructure/PostgresWebApplicationFactory.cs

@@ -34,21 +34,21 @@ public PostgresWebApplicationFactory()
 
     protected override void ConfigureWebHost(IWebHostBuilder builder)
     {
-        if (_useTestcontainers && TryEnsureContainer())
+        builder.ConfigureAppConfiguration((context, config) =>
         {
-            _connectionString = BuildConnectionString(_container!);
+            var settings = new Dictionary<string, string?>
+            {
+                ["EmailSettings:UseFakeEmail"] = "true"
+            };
 
-            builder.ConfigureAppConfiguration((context, config) =>
+            if (_useTestcontainers && TryEnsureContainer())
             {
-                var settings = new Dictionary<string, string?>
-                {
-                    ["ConnectionStrings:DefaultConnection"] = _connectionString,
-                    ["EmailSettings:UseFakeEmail"] = "true"
-                };
-
-                config.AddInMemoryCollection(settings);
-            });
-        }
+                _connectionString = BuildConnectionString(_container!);
+                settings["ConnectionStrings:DefaultConnection"] = _connectionString;
+            }
+
+            config.AddInMemoryCollection(settings);
+        });
 
         builder.ConfigureTestServices(services =>
         {