From 51fb1b787ab92a95e6e263f7419f80432b6f5f8d Mon Sep 17 00:00:00 2001
From: "N. Taylor Mullen" <nimullen@microsoft.com>
Date: Wed, 10 May 2017 16:32:34 -0700
Subject: [PATCH] Add TagHelperFactsServiceTest to validate root with parent
 expecting descriptor.

#1253
---
 .../DefaultTagHelperFactsServiceTest.cs       | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/DefaultTagHelperFactsServiceTest.cs b/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/DefaultTagHelperFactsServiceTest.cs
index d9e9eb4f33..acd5a54925 100644
--- a/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/DefaultTagHelperFactsServiceTest.cs
+++ b/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/DefaultTagHelperFactsServiceTest.cs
@@ -306,6 +306,32 @@ namespace Microsoft.VisualStudio.LanguageServices.Razor
             Assert.Equal(documentDescriptors, descriptors, TagHelperDescriptorComparer.CaseSensitive);
         }
 
+        [Fact]
+        public void GetTagHelpersGivenParent_AllowsRootParentTagForParentRestrictedTagHelperDescriptors()
+        {
+            // Arrange
+            var documentDescriptors = new[]
+            {
+                TagHelperDescriptorBuilder.Create("DivTagHelper", "TestAssembly")
+                    .TagMatchingRule(rule => rule.RequireTagName("div"))
+                    .Build(),
+                TagHelperDescriptorBuilder.Create("PTagHelper", "TestAssembly")
+                    .TagMatchingRule(rule => rule
+                        .RequireTagName("p")
+                        .RequireParentTag("body"))
+                    .Build()
+            };
+            var documentContext = TagHelperDocumentContext.Create(string.Empty, documentDescriptors);
+            var service = new DefaultTagHelperFactsService();
+
+            // Act
+            var descriptors = service.GetTagHelpersGivenParent(documentContext, parentTag: null /* root */);
+
+            // Assert
+            var descriptor = Assert.Single(descriptors);
+            Assert.Equal(documentDescriptors[0], descriptor, TagHelperDescriptorComparer.CaseSensitive);
+        }
+
         [Fact]
         public void GetTagHelpersGivenParent_AllowsUnspecifiedParentTagHelpers()
         {