diff --git a/tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/Pages/QueryStringDrillInTests.cs b/tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/Pages/QueryStringDrillInTests.cs
index 11672ff0..7d21bdd1 100644
--- a/tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/Pages/QueryStringDrillInTests.cs
+++ b/tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/Pages/QueryStringDrillInTests.cs
@@ -13,6 +13,7 @@ using Microsoft.Extensions.Logging.Abstractions;
 using Microsoft.Extensions.Options;
 using NSubstitute;
 using ZB.MOM.WW.ScadaBridge.CentralUI.Components.Shared;
+using ZB.MOM.WW.ScadaBridge.CentralUI.Services;
 using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;
 using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories;
 using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
@@ -161,6 +162,9 @@ public sealed class QueryStringDrillInTests
 
             Services.AddSingleton(Comms);
             Services.AddSingleton<IDialogService>(new AlwaysConfirmDialogService());
+            // M6 (K14): the SiteCallsReport page now injects IKpiHistoryQueryService
+            // for the Trends section. Provide a stand-in so these drill-in tests render.
+            Services.AddSingleton(Substitute.For<IKpiHistoryQueryService>());
 
             var siteRepo = Substitute.For<ISiteRepository>();
             siteRepo.GetAllSitesAsync(Arg.Any<CancellationToken>())