diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/ResilienceInvokerFactoryRegistrationTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/ResilienceInvokerFactoryRegistrationTests.cs
index 6d6ec6b6..039b975f 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/ResilienceInvokerFactoryRegistrationTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/ResilienceInvokerFactoryRegistrationTests.cs
@@ -4,6 +4,7 @@ using Xunit;
 using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
 using ZB.MOM.WW.OtOpcUa.Core.Resilience;
 using ZB.MOM.WW.OtOpcUa.Host.Drivers;
+using ZB.MOM.WW.Secrets.Abstractions;
 
 namespace ZB.MOM.WW.OtOpcUa.Host.IntegrationTests;
 
@@ -24,6 +25,9 @@ public sealed class ResilienceInvokerFactoryRegistrationTests
     {
         var services = new ServiceCollection();
         services.AddLogging();
+        // The driver-factory registration resolves ISecretResolver (Galaxy/OpcUaClient secret: refs);
+        // the real host always has it via AddZbSecrets (registered unconditionally). Mirror that here.
+        services.AddSingleton<ISecretResolver>(new StubSecretResolver());
         services.AddOtOpcUaDriverFactories();
 
         using var sp = services.BuildServiceProvider();
@@ -38,6 +42,9 @@ public sealed class ResilienceInvokerFactoryRegistrationTests
     {
         var services = new ServiceCollection();
         services.AddLogging();
+        // The driver-factory registration resolves ISecretResolver (Galaxy/OpcUaClient secret: refs);
+        // the real host always has it via AddZbSecrets (registered unconditionally). Mirror that here.
+        services.AddSingleton<ISecretResolver>(new StubSecretResolver());
         services.AddOtOpcUaDriverFactories();
 
         using var sp = services.BuildServiceProvider();
@@ -54,6 +61,9 @@ public sealed class ResilienceInvokerFactoryRegistrationTests
     {
         var services = new ServiceCollection();
         services.AddLogging();
+        // The driver-factory registration resolves ISecretResolver (Galaxy/OpcUaClient secret: refs);
+        // the real host always has it via AddZbSecrets (registered unconditionally). Mirror that here.
+        services.AddSingleton<ISecretResolver>(new StubSecretResolver());
         services.AddOtOpcUaDriverFactories();
 
         using var sp = services.BuildServiceProvider();
@@ -65,4 +75,12 @@ public sealed class ResilienceInvokerFactoryRegistrationTests
         sp.GetRequiredService<DriverResiliencePipelineBuilder>()
             .ShouldBeSameAs(sp.GetRequiredService<DriverResiliencePipelineBuilder>(), "builder must be a singleton");
     }
+
+    // Minimal ISecretResolver so AddOtOpcUaDriverFactories' registration (which resolves it for
+    // Galaxy/OpcUaClient secret: refs) can be built. These tests exercise no secret: refs, so
+    // returning null for every name is sufficient — the real resolver comes from AddZbSecrets.
+    private sealed class StubSecretResolver : ISecretResolver
+    {
+        public Task<string?> GetAsync(SecretName name, CancellationToken ct) => Task.FromResult<string?>(null);
+    }
 }