Adding unit tests

GameAuthApi.Tests/ItemControllerTests.cs

@@ -0,0 +1,27 @@
+using GameAuthApi.Controllers;
+using GameAuthApi.Models;
+using GameAuthApi.Services;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
+
+public class ItemControllerTests
+{
+    private static IConfiguration config = new ConfigurationBuilder()
+        .AddInMemoryCollection(new Dictionary<string,string>
+        {
+            {"MongoDB:ConnectionString","mongodb://localhost"},
+            {"MongoDB:DatabaseName","test"}
+        }).Build();
+
+    [Fact]
+    public async Task Create_InvalidLocation_ReturnsBadRequest()
+    {
+        var loc = new Mock<LocationService>(config);
+        loc.Setup(l => l.GetByIdAsync("bad")).ReturnsAsync((Location?)null);
+        var controller = new ItemController(new Mock<ItemService>(config).Object, loc.Object);
+
+        var result = await controller.Create(new CreateItemRequest { LocationId = "bad", Name = "n" });
+
+        Assert.IsType<BadRequestObjectResult>(result);
+    }
+}