too much for one commit

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

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+using EntKube.Provisioning.Domain;
+using EntKube.Provisioning.Features.Apps.RemoveAppEnvironment;
+using EntKube.Provisioning.Infrastructure;
+using EntKube.SharedKernel.Domain;
+using FluentAssertions;
+
+namespace EntKube.Provisioning.Tests.Features;
+
+public class RemoveAppEnvironmentHandlerTests
+{
+    private readonly InMemoryAppRepository repository;
+    private readonly RemoveAppEnvironmentHandler handler;
+
+    public RemoveAppEnvironmentHandlerTests()
+    {
+        repository = new InMemoryAppRepository();
+        handler = new RemoveAppEnvironmentHandler(repository);
+    }
+
+    [Fact]
+    public async Task HandleAsync_ExistingEnvironment_RemovesSuccessfully()
+    {
+        // Arrange — An app with one environment.
+
+        App app = App.Create(Guid.NewGuid(), Guid.NewGuid(), "API", "api", AppType.Deployment);
+        Guid envId = Guid.NewGuid();
+        app.AddEnvironment(envId, Guid.NewGuid(), "api-dev");
+        await repository.AddAsync(app);
+
+        // Act
+
+        Result result = await handler.HandleAsync(new RemoveAppEnvironmentRequest(app.Id, envId));
+
+        // Assert — The environment should be removed.
+
+        result.IsSuccess.Should().BeTrue();
+        App? updated = await repository.GetByIdAsync(app.Id);
+        updated!.Environments.Should().BeEmpty();
+    }
+
+    [Fact]
+    public async Task HandleAsync_NonexistentApp_ReturnsFailure()
+    {
+        // Act
+
+        Result result = await handler.HandleAsync(new RemoveAppEnvironmentRequest(Guid.NewGuid(), Guid.NewGuid()));
+
+        // Assert
+
+        result.IsFailure.Should().BeTrue();
+        result.Error.Should().Contain("not found");
+    }
+
+    [Fact]
+    public async Task HandleAsync_NonexistentEnvironment_ReturnsFailure()
+    {
+        // Arrange — An app with no environments.
+
+        App app = App.Create(Guid.NewGuid(), Guid.NewGuid(), "API", "api", AppType.Deployment);
+        await repository.AddAsync(app);
+
+        // Act
+
+        Result result = await handler.HandleAsync(new RemoveAppEnvironmentRequest(app.Id, Guid.NewGuid()));
+
+        // Assert
+
+        result.IsFailure.Should().BeTrue();
+        result.Error.Should().Contain("not found");
+    }
+}