Expand coverage to full backend assembly

RpgRoller.Tests/BackendCoverageTests.cs

@@ -0,0 +1,60 @@
+using System.Reflection;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.FileProviders;
+using RpgRoller.Hosting;
+
+namespace RpgRoller.Tests;
+
+public sealed class BackendCoverageTests
+{
+    [Fact]
+    public void AddRpgRollerCore_WithInMemoryConnectionString_RegistersCoreServices()
+    {
+        var services = new ServiceCollection();
+        var configuration = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["ConnectionStrings:RpgRoller"] = "Data Source=:memory:"
+            })
+            .Build();
+
+        var environment = new TestWebHostEnvironment
+        {
+            ContentRootPath = Path.GetTempPath()
+        };
+
+        services.AddRpgRollerCore(configuration, environment);
+
+        Assert.Contains(services, d => d.ServiceType == typeof(RpgRoller.Services.IGameService));
+        Assert.Contains(services, d => d.ServiceType == typeof(RpgRoller.Services.IDiceRoller));
+    }
+
+    [Fact]
+    public void GetRequiredSessionToken_ThrowsWhenTokenWasNotStored()
+    {
+        var extensionsType = typeof(Program).Assembly.GetType("RpgRoller.Api.SessionTokenHttpContextExtensions");
+        Assert.NotNull(extensionsType);
+
+        var method = extensionsType!.GetMethod(
+            "GetRequiredSessionToken",
+            BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
+        Assert.NotNull(method);
+
+        var context = new DefaultHttpContext();
+        var exception = Assert.Throws<TargetInvocationException>(() => method!.Invoke(null, [context]));
+        Assert.IsType<InvalidOperationException>(exception.InnerException);
+    }
+
+    private sealed class TestWebHostEnvironment : IWebHostEnvironment
+    {
+        public string ApplicationName { get; set; } = "RpgRoller.Tests";
+        public IFileProvider WebRootFileProvider { get; set; } = new NullFileProvider();
+        public string WebRootPath { get; set; } = string.Empty;
+        public string EnvironmentName { get; set; } = "Development";
+        public string ContentRootPath { get; set; } = string.Empty;
+        public IFileProvider ContentRootFileProvider { get; set; } = new NullFileProvider();
+    }
+}