Add ICacheKey tests

Author: ronaldbarendse

tests/ImageSharp.Web.Tests/Caching/CacheKeyTests.cs

@@ -0,0 +1,59 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using System;
+using Microsoft.AspNetCore.Http;
+using SixLabors.ImageSharp.Web.Caching;
+using SixLabors.ImageSharp.Web.Commands;
+using Xunit;
+
+namespace SixLabors.ImageSharp.Web.Tests.Caching
+{
+    public class CacheKeyTests
+    {
+        private static readonly ICacheKey UriRelativeCacheKey = new UriRelativeCacheKey();
+        private static readonly ICacheKey UriAbsoluteCacheKey = new UriAbsoluteCacheKey();
+
+        [Fact]
+        public void UriRelativeCacheKeyOuputIsRelativeAndLowercase()
+        {
+            HttpContext context = CreateHttpContext();
+            var commands = new CommandCollection()
+            {
+                { "Width", "400" }
+            };
+
+            string expected = "/images/image-12345.jpeg?width=400";
+            string actual = UriRelativeCacheKey.Create(context, commands);
+
+            Assert.Equal(expected, actual);
+        }
+
+        [Fact]
+        public void UriAbsoluteCacheKeyOuputIsAbsoluteAndLowercase()
+        {
+            HttpContext context = CreateHttpContext();
+            var commands = new CommandCollection()
+            {
+                { "Width", "400" }
+            };
+
+            string expected = "http://testwebsite.com/images/image-12345.jpeg?width=400";
+            string actual = UriAbsoluteCacheKey.Create(context, commands);
+
+            Assert.Equal(expected, actual);
+        }
+
+        private static HttpContext CreateHttpContext()
+        {
+            var httpContext = new DefaultHttpContext();
+            httpContext.Request.Scheme = Uri.UriSchemeHttp;
+            httpContext.Request.Host = new HostString("Testwebsite.com");
+            httpContext.Request.PathBase = "/Images";
+            httpContext.Request.Path = "/Image-12345.jpeg";
+            httpContext.Request.QueryString = new QueryString("?Should-Be=Ignored");
+
+            return httpContext;
+        }
+    }
+}