too much for one commit

tests/EntKube.Provisioning.Tests/Features/DecommissionServiceHandlerTests.cs

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+using EntKube.Provisioning.Domain;
+using EntKube.Provisioning.Features.DecommissionService;
+using EntKube.Provisioning.Infrastructure;
+using EntKube.SharedKernel.Domain;
+using FluentAssertions;
+
+namespace EntKube.Provisioning.Tests.Features;
+
+public class DecommissionServiceHandlerTests
+{
+    private readonly DecommissionServiceHandler handler;
+    private readonly InMemoryServiceInstanceRepository repository;
+
+    public DecommissionServiceHandlerTests()
+    {
+        repository = new InMemoryServiceInstanceRepository();
+        handler = new DecommissionServiceHandler(repository);
+    }
+
+    [Fact]
+    public async Task HandleAsync_WithRunningService_SetsDesiredStateToDecommissioned()
+    {
+        // Arrange — A running service exists in the repository.
+
+        ServiceInstance instance = ServiceInstance.Provision(
+            Guid.NewGuid(),
+            ServiceType.MinIO,
+            "tenant-storage",
+            "minio-system",
+            Guid.NewGuid());
+
+        instance.MarkRunning();
+        await repository.AddAsync(instance);
+
+        // Act — Request decommission.
+
+        Result result = await handler.HandleAsync(instance.Id);
+
+        // Assert — The desired state should be Decommissioned.
+
+        result.IsSuccess.Should().BeTrue();
+
+        ServiceInstance? updated = await repository.GetByIdAsync(instance.Id);
+        updated.Should().NotBeNull();
+        updated!.DesiredState.Should().Be(ServiceState.Decommissioned);
+    }
+
+    [Fact]
+    public async Task HandleAsync_WithNonExistentId_ReturnsFailure()
+    {
+        // Arrange — An ID that doesn't exist.
+
+        Guid unknownId = Guid.NewGuid();
+
+        // Act
+
+        Result result = await handler.HandleAsync(unknownId);
+
+        // Assert
+
+        result.IsFailure.Should().BeTrue();
+        result.Error.Should().Contain("not found");
+    }
+}