Add additional service registration tests

Author: ronaldbarendse

tests/ImageSharp.Web.Tests/DependencyInjection/MockCacheHash.cs

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+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using SixLabors.ImageSharp.Web.Caching;
+
+namespace SixLabors.ImageSharp.Web.Tests.DependencyInjection
+{
+    public class MockCacheHash : ICacheHash
+    {
+        public string Create(string value, uint length) => null;
+    }
+}

tests/ImageSharp.Web.Tests/DependencyInjection/MockCacheKey.cs

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+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using Microsoft.AspNetCore.Http;
+using SixLabors.ImageSharp.Web.Caching;
+using SixLabors.ImageSharp.Web.Commands;
+
+namespace SixLabors.ImageSharp.Web.Tests.DependencyInjection
+{
+    public class MockCacheKey : ICacheKey
+    {
+        public string Create(HttpContext context, CommandCollection commands) => null;
+    }
+}

tests/ImageSharp.Web.Tests/DependencyInjection/MockImageCache.cs

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+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using System.IO;
+using System.Threading.Tasks;
+using SixLabors.ImageSharp.Web.Caching;
+using SixLabors.ImageSharp.Web.Resolvers;
+
+namespace SixLabors.ImageSharp.Web.Tests.DependencyInjection
+{
+    public class MockImageCache : IImageCache
+    {
+        public Task<IImageCacheResolver> GetAsync(string key) => Task.FromResult<IImageCacheResolver>(null);
+
+        public Task SetAsync(string key, Stream stream, ImageCacheMetadata metadata) => Task.CompletedTask;
+    }
+}

tests/ImageSharp.Web.Tests/DependencyInjection/MockRequestParser.cs

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+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using Microsoft.AspNetCore.Http;
+using SixLabors.ImageSharp.Web.Commands;
+
+namespace SixLabors.ImageSharp.Web.Tests.DependencyInjection
+{
+    public class MockRequestParser : IRequestParser
+    {
+        public CommandCollection ParseRequestCommands(HttpContext context) => null;
+    }
+}