Added extension and improved tests

Author: FlorianRappl

src/AngleSharp.Io.Tests/Integration/DownloadTests.cs

@@ -67,9 +67,9 @@ public async Task StandardDownloadBinary()
             var document = await context.OpenAsync(req => req.Content("<a href=\"http://example.com/setup.exe\">Download setup</a>"));
             var linkedDownload = await document.QuerySelector<IHtmlAnchorElement>("a").NavigateAsync();
 
-            Assert.AreEqual("setup.exe", downloadSeen);
             Assert.IsNull(linkedDownload);
             Assert.AreEqual(document, context.Active);
+            Assert.AreEqual("setup.exe", downloadSeen);
         }
     }
 }

src/AngleSharp.Io.Tests/Network/FileRequesterTests.cs

@@ -55,8 +55,7 @@ public async Task FollowLinkToUseFileRequesterUsingStandardRequesters()
             var context = BrowsingContext.New(config);
             var document = await context.OpenAsync(res => res.Content("<a href='" + url + "'>Download</a>"));
             var result = await document.QuerySelector<IHtmlAnchorElement>("a").NavigateAsync();
-            var content = result.Body.TextContent;
-            Assert.AreEqual(0, content.Length);
+            Assert.IsNull(result);
         }
     }
 }

src/AngleSharp.Io.Tests/Network/FtpRequesterTests.cs

@@ -1,4 +1,4 @@
-namespace AngleSharp.Io.Tests.Network
+namespace AngleSharp.Io.Tests.Network
 {
     using AngleSharp.Dom;
     using AngleSharp.Html.Dom;
@@ -43,8 +43,7 @@ public async Task FollowLinkToUseFtpRequesterUsingStandardRequesters()
             var context = BrowsingContext.New(config);
             var document = await context.OpenAsync(res => res.Content("<a href='ftp://ftp.funet.fi/pub/standards/w3/TR/2003/xhtml2-20030506/attributes.html'>Download</a>"));
             var result = await document.QuerySelector<IHtmlAnchorElement>("a").NavigateAsync();
-            var content = result.Body.TextContent;
-            Assert.AreEqual(0, content.Length);
+            Assert.IsNull(result);
         }
     }
 }

src/AngleSharp.Io/IoConfigurationExtensions.cs

@@ -30,7 +30,10 @@ public static IConfiguration WithDownload(this IConfiguration configuration, Fun
         {
             var oldFactory = configuration.Services.OfType<IDocumentFactory>().FirstOrDefault();
             var newFactory = new DownloadFactory(oldFactory, download);
-            return configuration.WithOnly<IDocumentFactory>(newFactory);
+            return configuration.WithDefaultLoader(new LoaderOptions
+            {
+                Filter = req => false,
+            }).WithOnly<IDocumentFactory>(newFactory);
         }
 
         /// <summary>
@@ -133,6 +136,16 @@ public static IConfiguration WithPersistentCookies(this IConfiguration configura
         public static IConfiguration WithTemporaryCookies(this IConfiguration configuration) =>
             configuration.WithCookies(new MemoryFileHandler());
 
+        /// <summary>
+        /// Registers a non-persistent advanced cookie container using the memory-only file
+        /// handler.
+        /// Alias for WithTemporaryCookies().
+        /// </summary>
+        /// <param name="configuration">The configuration to extend.</param>
+        /// <returns>The new instance with the service.</returns>
+        public static IConfiguration WithCookies(this IConfiguration configuration) =>
+            configuration.WithTemporaryCookies();
+
         /// <summary>
         /// Registers the advanced cookie service.
         /// </summary>
@@ -149,7 +162,7 @@ public static IConfiguration WithCookies(this IConfiguration configuration, ICoo
         /// <param name="provider">The provider for cookie interactions.</param>
         /// <returns>The new instance with the service.</returns>
         public static IConfiguration WithCookies(this IConfiguration configuration, ICookieProvider provider) =>
-            configuration.WithOnly<ICookieProvider>(provider);
+            configuration.WithOnly(provider);
 
         #endregion
     }