dotnet xUnit Tests

AGENTS.md

@@ -5,6 +5,11 @@
 - Nach jeder CSS-Anpassung (`*.css` Dateien) immer `cd client && npm run build` ausfuehren um zu pruefen ob der Build fehlerfrei durchlaeuft
 - Nach Aenderungen an Komponenten-Dateien (`*.tsx`) ebenfalls `npm run build` ausfuehren
 
+## .NET / Backend
+
+- Nach Aenderungen an `.cs` Dateien immer `dotnet build` ausfuehren
+- Anschliessend `dotnet test` im `FocusApp.Tests` Verzeichnis ausfuehren
+
 ## Docker
 
 - Nach Aenderungen am `Dockerfile` oder `docker-compose.yml` immer `docker build .` ausfuehren

Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
   <!-- Exclude node_modules from Visual Studio -->
   <PropertyGroup>
-    <DefaultItemExcludes>$(DefaultItemExcludes);client\node_modules\**</DefaultItemExcludes>
+    <DefaultItemExcludes>$(DefaultItemExcludes);client\node_modules\**;FocusApp.Tests\**</DefaultItemExcludes>
     <EnableDefaultItems>true</EnableDefaultItems>
   </PropertyGroup>
 

FocusApp.Tests/FocusApp.Tests.csproj

@@ -0,0 +1,28 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.10" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.10" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.10" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\FocusApp.csproj" />
+  </ItemGroup>
+
+</Project>

FocusApp.Tests/FocusTasksControllerTests.cs

@@ -0,0 +1,158 @@
+// Copyright (c) 2026 Stefan Koelle (https://stefankoelle.de)
+// Licensed under the MIT License. See LICENSE file in project root for details.
+using FocusApp.Controllers;
+using FocusApp.Data;
+using FocusApp.Models;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using Xunit;
+
+namespace FocusApp.Tests;
+
+public class FocusTasksControllerTests : IDisposable
+{
+    private readonly FocusContext _context;
+    private readonly FocusTasksController _controller;
+    private readonly ILogger<FocusTasksController> _logger;
+
+    public FocusTasksControllerTests()
+    {
+        var options = new DbContextOptionsBuilder<FocusContext>()
+            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
+            .Options;
+
+        _context = new FocusContext(options);
+        _logger = new LoggerFactory().CreateLogger<FocusTasksController>();
+        _controller = new FocusTasksController(_context, _logger);
+    }
+
+    public void Dispose()
+    {
+        _context.Database.EnsureDeleted();
+        _context.Dispose();
+    }
+
+    [Fact]
+    public async Task GetTasks_ReturnsEmptyList_WhenNoTasks()
+    {
+        var result = await _controller.GetTasks();
+
+        var okResult = Assert.IsType<OkObjectResult>(result.Result);
+        var tasks = Assert.IsAssignableFrom<IEnumerable<FocusTask>>(okResult.Value);
+        Assert.Empty(tasks);
+    }
+
+    [Fact]
+    public async Task CreateTask_ReturnsCreatedAtAction_WithValidData()
+    {
+        var dto = new CreateTaskDto { Title = "Test Task", Description = "Test Description" };
+
+        var result = await _controller.CreateTask(dto);
+
+        var createdResult = Assert.IsType<CreatedAtActionResult>(result.Result);
+        var task = Assert.IsType<FocusTask>(createdResult.Value);
+        Assert.Equal("Test Task", task.Title);
+        Assert.Equal("Test Description", task.Description);
+        Assert.Equal(1, task.Order);
+    }
+
+    [Fact]
+    public async Task CreateTask_ReturnsBadRequest_WhenTitleIsEmpty()
+    {
+        var dto = new CreateTaskDto { Title = "" };
+
+        var result = await _controller.CreateTask(dto);
+
+        Assert.IsType<BadRequestObjectResult>(result.Result);
+    }
+
+    [Fact]
+    public async Task CreateTask_ReturnsBadRequest_WhenTitleExceedsMaxLength()
+    {
+        var dto = new CreateTaskDto { Title = new string('A', 256) };
+
+        var result = await _controller.CreateTask(dto);
+
+        Assert.IsType<BadRequestObjectResult>(result.Result);
+    }
+
+    [Fact]
+    public async Task UpdateTask_ReturnsOk_WithValidData()
+    {
+        var createDto = new CreateTaskDto { Title = "Original" };
+        var created = await _controller.CreateTask(createDto);
+        var createdTask = (created.Result as CreatedAtActionResult)!.Value as FocusTask;
+
+        var updateDto = new UpdateTaskDto { Title = "Updated" };
+        var result = await _controller.UpdateTask(createdTask!.Id, updateDto);
+
+        var okResult = Assert.IsType<OkObjectResult>(result);
+        var task = Assert.IsType<FocusTask>(okResult.Value);
+        Assert.Equal("Updated", task.Title);
+    }
+
+    [Fact]
+    public async Task UpdateTask_ReturnsNotFound_WhenTaskDoesNotExist()
+    {
+        var dto = new UpdateTaskDto { Title = "Updated" };
+
+        var result = await _controller.UpdateTask(999, dto);
+
+        Assert.IsType<NotFoundResult>(result);
+    }
+
+    [Fact]
+    public async Task DeleteTask_ReturnsNoContent_WhenTaskExists()
+    {
+        var createDto = new CreateTaskDto { Title = "To Delete" };
+        var created = await _controller.CreateTask(createDto);
+        var createdTask = (created.Result as CreatedAtActionResult)!.Value as FocusTask;
+
+        var result = await _controller.DeleteTask(createdTask!.Id);
+
+        Assert.IsType<NoContentResult>(result);
+    }
+
+    [Fact]
+    public async Task DeleteTask_ReturnsNotFound_WhenTaskDoesNotExist()
+    {
+        var result = await _controller.DeleteTask(999);
+
+        Assert.IsType<NotFoundResult>(result);
+    }
+
+    [Fact]
+    public async Task ReorderTasks_ReturnsOk_WithValidOrders()
+    {
+        var task1 = await _controller.CreateTask(new CreateTaskDto { Title = "Task 1" });
+        var task2 = await _controller.CreateTask(new CreateTaskDto { Title = "Task 2" });
+        var t1 = (task1.Result as CreatedAtActionResult)!.Value as FocusTask;
+        var t2 = (task2.Result as CreatedAtActionResult)!.Value as FocusTask;
+
+        var reorderDto = new ReorderDto
+        {
+            Orders = new List<OrderItem>
+            {
+                new OrderItem { Id = t1!.Id, Order = 2 },
+                new OrderItem { Id = t2!.Id, Order = 1 }
+            }
+        };
+
+        var result = await _controller.ReorderTasks(reorderDto);
+
+        var okResult = Assert.IsType<OkObjectResult>(result);
+        var tasks = Assert.IsAssignableFrom<IEnumerable<FocusTask>>(okResult.Value);
+        Assert.Equal(2, tasks.Count());
+    }
+
+    [Fact]
+    public async Task ReorderTasks_ReturnsBadRequest_WhenNoOrders()
+    {
+        var reorderDto = new ReorderDto { Orders = new List<OrderItem>() };
+
+        var result = await _controller.ReorderTasks(reorderDto);
+
+        Assert.IsType<BadRequestObjectResult>(result);
+    }
+}