Introduced test to validate IsPrivateBranch behavior

The test adds a new `Page` marked with the `IsPrivateBranch` attribute, as well as a child, and confirms that neither the page, nor its child, appear in the `SitemapController`. This validates the functionality introduced in dfd98af, and as specified in #72.

Author: JeremyCaney

OnTopic.AspNetCore.Mvc.Tests/TestDoubles/TestTopicRepository.cs

@@ -68,6 +68,8 @@ private static Topic CreateFakeData() {
       _                         = new Topic("NoIndexChild", "Page", noIndexPage);
       var noIndexContainer      = new Topic("NoIndexContainer", "Container", webTopic);
       _                         = new Topic("NoIndexContainerChild", "Page", noIndexContainer);
+      var privateBranch         = new Topic("PrivateBranch", "Page", webTopic);
+      _                         = new Topic("PrivateBranchChild", "Page", privateBranch);
       var disabledPage          = new Topic("Disabled", "Page", webTopic);
       var pageGroup             = new Topic("PageGroup", "PageGroup", rootTopic);
       _                         = new Topic("PageGroupChild", "Page", pageGroup);
@@ -97,6 +99,7 @@ private static Topic CreateFakeData() {
 
       //Excluded descendants
       noIndexContainer.Attributes.SetBoolean("NoIndex", true);
+      privateBranch.Attributes.SetBoolean("IsPrivateBranch", true);
 
       /*------------------------------------------------------------------------------------------------------------------------
       | Return data

OnTopic.AspNetCore.Mvc.Tests/TopicControllerTest.cs

@@ -207,11 +207,11 @@ public void SitemapController_Index_ExcludesContentTypes() {
     [Fact]
     public void SitemapController_Index_ExcludesContainerDescendants() {
 
-      var controller = new SitemapController(_topicRepository) {
-        ControllerContext = new(_context)
+      var controller            = new SitemapController(_topicRepository) {
+        ControllerContext       = new(_context)
       };
-      var result = controller.Extended(true) as ContentResult;
-      var model = result?.Content as string;
+      var result                = controller.Extended(true) as ContentResult;
+      var model                 = result?.Content as string;
 
       controller.Dispose();
 
@@ -221,6 +221,29 @@ public void SitemapController_Index_ExcludesContainerDescendants() {
 
     }
 
+    /*==========================================================================================================================
+    | TEST: SITEMAP CONTROLLER: INDEX: EXCLUDES PRIVATE BRANCHES
+    \-------------------------------------------------------------------------------------------------------------------------*/
+    /// <summary>
+    ///   Triggers the index action of the <see cref="SitemapController.Index(Boolean, Boolean)" /> action and verifies that it
+    ///   properly excludes the topics that are marked as <c>IsPrivateBranch</c>, including their descendants.
+    /// </summary>
+    [Fact]
+    public void SitemapController_Index_ExcludesPrivateBranches() {
+
+      var controller            = new SitemapController(_topicRepository) {
+        ControllerContext       = new(_context)
+      };
+      var result                = controller.Extended(true) as ContentResult;
+      var model                 = result?.Content as string;
+
+      controller.Dispose();
+
+      Assert.NotNull(model);
+      Assert.False(model!.Contains("PrivateBranch/</loc>", StringComparison.Ordinal));
+      Assert.False(model!.Contains("PrivateBranchChild/</loc>", StringComparison.Ordinal));
+
+    }
 
     /*==========================================================================================================================
     | TEST: SITEMAP CONTROLLER: EXTENDED: INCLUDES ATTRIBUTES