diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 66a908d..2c0d3ed 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,31 +35,34 @@ jobs:
         run: dotnet build -c Release --no-restore
 
       - name: Test - Dhl.Shipping
-        run: dotnet test tests/Parcel.NET.Dhl.Shipping.Tests/Parcel.NET.Dhl.Shipping.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+        run: dotnet test --project tests/Parcel.NET.Dhl.Shipping.Tests/Parcel.NET.Dhl.Shipping.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
 
       - name: Test - Dhl.Tracking
-        run: dotnet test tests/Parcel.NET.Dhl.Tracking.Tests/Parcel.NET.Dhl.Tracking.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+        run: dotnet test --project tests/Parcel.NET.Dhl.Tracking.Tests/Parcel.NET.Dhl.Tracking.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
 
       - name: Test - Dhl.UnifiedTracking
-        run: dotnet test tests/Parcel.NET.Dhl.UnifiedTracking.Tests/Parcel.NET.Dhl.UnifiedTracking.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+        run: dotnet test --project tests/Parcel.NET.Dhl.UnifiedTracking.Tests/Parcel.NET.Dhl.UnifiedTracking.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
 
       - name: Test - Dhl.Pickup
-        run: dotnet test tests/Parcel.NET.Dhl.Pickup.Tests/Parcel.NET.Dhl.Pickup.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+        run: dotnet test --project tests/Parcel.NET.Dhl.Pickup.Tests/Parcel.NET.Dhl.Pickup.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
 
       - name: Test - Dhl.Returns
-        run: dotnet test tests/Parcel.NET.Dhl.Returns.Tests/Parcel.NET.Dhl.Returns.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+        run: dotnet test --project tests/Parcel.NET.Dhl.Returns.Tests/Parcel.NET.Dhl.Returns.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
 
       - name: Test - Dhl.Internetmarke
-        run: dotnet test tests/Parcel.NET.Dhl.Internetmarke.Tests/Parcel.NET.Dhl.Internetmarke.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+        run: dotnet test --project tests/Parcel.NET.Dhl.Internetmarke.Tests/Parcel.NET.Dhl.Internetmarke.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
 
       - name: Test - Dhl.LocationFinder
-        run: dotnet test tests/Parcel.NET.Dhl.LocationFinder.Tests/Parcel.NET.Dhl.LocationFinder.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+        run: dotnet test --project tests/Parcel.NET.Dhl.LocationFinder.Tests/Parcel.NET.Dhl.LocationFinder.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
 
       - name: Test - GoExpress.Shipping
-        run: dotnet test tests/Parcel.NET.GoExpress.Shipping.Tests/Parcel.NET.GoExpress.Shipping.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+        run: dotnet test --project tests/Parcel.NET.GoExpress.Shipping.Tests/Parcel.NET.GoExpress.Shipping.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+
+      - name: Test - GoExpress.Tracking
+        run: dotnet test --project tests/Parcel.NET.GoExpress.Tracking.Tests/Parcel.NET.GoExpress.Tracking.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
 
       - name: Test - LetterXpress.Letters
-        run: dotnet test tests/Parcel.NET.LetterXpress.Letters.Tests/Parcel.NET.LetterXpress.Letters.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
+        run: dotnet test --project tests/Parcel.NET.LetterXpress.Letters.Tests/Parcel.NET.LetterXpress.Letters.Tests.csproj -c Release --no-build -f ${{ matrix.target-framework }}
 
       - name: Check for vulnerable packages
         if: matrix.target-framework == 'net10.0'
diff --git a/global.json b/global.json
index 0860802..4babe73 100644
--- a/global.json
+++ b/global.json
@@ -2,5 +2,8 @@
   "sdk": {
     "version": "10.0.100",
     "rollForward": "latestMinor"
+  },
+  "test": {
+    "runner": "Microsoft.Testing.Platform"
   }
 }
diff --git a/tests/Parcel.NET.LetterXpress.Letters.Tests/LetterXpressClientTests.cs b/tests/Parcel.NET.LetterXpress.Letters.Tests/LetterXpressClientTests.cs
index 56e44ea..050bf5c 100644
--- a/tests/Parcel.NET.LetterXpress.Letters.Tests/LetterXpressClientTests.cs
+++ b/tests/Parcel.NET.LetterXpress.Letters.Tests/LetterXpressClientTests.cs
@@ -1,3 +1,4 @@
+using System.Globalization;
 using System.Net;
 using System.Security.Cryptography;
 using System.Text;
@@ -108,19 +109,20 @@ public async Task CreatePrintJobAsync_MapsRegisteredAndDispatchDate()
     {
         const string json = """{"status":200,"message":"OK","data":{"id":1,"status":"queue"}}""";
         var (client, handler) = CreateClient(json);
+        var dispatchDate = DateOnly.FromDateTime(DateTime.UtcNow).AddDays(7);
 
         await client.CreatePrintJobAsync(new LetterRequest
         {
             File = SamplePdf,
             Specification = new LetterSpecification { Shipping = ShippingType.National },
             Registered = RegisteredMail.EinschreibenEinwurf,
-            DispatchDate = new DateOnly(2026, 9, 1),
+            DispatchDate = dispatchDate,
             Notice = "KdNr. 4711"
         });
 
         var letter = BodyRoot(handler).GetProperty("letter");
         letter.GetProperty("registered").GetString().ShouldBe("r1");
-        letter.GetProperty("dispatch_date").GetString().ShouldBe("2026-09-01");
+        letter.GetProperty("dispatch_date").GetString().ShouldBe(dispatchDate.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
         letter.GetProperty("notice").GetString().ShouldBe("KdNr. 4711");
     }