From 489caed17c718faf7e39f7fa5f0f188f69afcb62 Mon Sep 17 00:00:00 2001
From: "N. Taylor Mullen" <nimullen@microsoft.com>
Date: Mon, 8 Sep 2014 17:13:36 -0700
Subject: [PATCH] Validate Tag Helper registration system functionality.

- This involved adding tests to cover GetTagHelpers methods on the default tag helper descriptor provider.

#70
---
 .../TagHelperDescriptorProviderTest.cs        | 88 +++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 test/Microsoft.AspNet.Razor.Test/TagHelpers/TagHelperDescriptorProviderTest.cs

diff --git a/test/Microsoft.AspNet.Razor.Test/TagHelpers/TagHelperDescriptorProviderTest.cs b/test/Microsoft.AspNet.Razor.Test/TagHelpers/TagHelperDescriptorProviderTest.cs
new file mode 100644
index 0000000000..d5797c47e1
--- /dev/null
+++ b/test/Microsoft.AspNet.Razor.Test/TagHelpers/TagHelperDescriptorProviderTest.cs
@@ -0,0 +1,88 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Linq;
+using Microsoft.AspNet.Razor.TagHelpers;
+using Xunit;
+
+namespace Microsoft.AspNet.Razor.Test.TagHelpers
+{
+    public class TagHelperDescriptorProviderTest
+    {
+        [Fact]
+        public void TagHelperDescriptorProvider_GetTagHelpersReturnsNothingForUnregisteredTags()
+        {
+            // Arrange
+            var divDescriptor = new TagHelperDescriptor("div", "foo1", ContentBehavior.None);
+            var spanDescriptor = new TagHelperDescriptor("span", "foo2", ContentBehavior.None);
+            var descriptors = new TagHelperDescriptor[] { divDescriptor, spanDescriptor };
+            var provider = new TagHelperDescriptorProvider(descriptors);
+
+            // Act
+            var retrievedDescriptors = provider.GetTagHelpers("foo");
+
+            // Assert
+            Assert.Empty(retrievedDescriptors);
+        }
+
+        [Fact]
+        public void TagHelperDescriptorProvider_GetTagHelpersDoesntReturnNonCatchAllTagsForCatchAll()
+        {
+            // Arrange
+            var divDescriptor = new TagHelperDescriptor("div", "foo1", ContentBehavior.None);
+            var spanDescriptor = new TagHelperDescriptor("span", "foo2", ContentBehavior.None);
+            var catchAllDescriptor = new TagHelperDescriptor("*", "foo3", ContentBehavior.None);
+            var descriptors = new TagHelperDescriptor[] { divDescriptor, spanDescriptor, catchAllDescriptor };
+            var provider = new TagHelperDescriptorProvider(descriptors);
+
+            // Act
+            var retrievedDescriptors = provider.GetTagHelpers("*");
+
+            // Assert
+            var descriptor = Assert.Single(retrievedDescriptors);
+            Assert.Same(catchAllDescriptor, descriptor);
+        }
+
+        [Fact]
+        public void TagHelperDescriptorProvider_GetTagHelpersReturnsCatchAllsWithEveryTagName()
+        {
+            // Arrange
+            var divDescriptor = new TagHelperDescriptor("div", "foo1", ContentBehavior.None);
+            var spanDescriptor = new TagHelperDescriptor("span", "foo2", ContentBehavior.None);
+            var catchAllDescriptor = new TagHelperDescriptor("*", "foo3", ContentBehavior.None);
+            var descriptors = new TagHelperDescriptor[] { divDescriptor, spanDescriptor, catchAllDescriptor };
+            var provider = new TagHelperDescriptorProvider(descriptors);
+
+            // Act
+            var divDescriptors = provider.GetTagHelpers("div");
+            var spanDescriptors = provider.GetTagHelpers("span");
+
+            // Assert
+            // For divs
+            Assert.Equal(2, divDescriptors.Count());
+            Assert.Contains(divDescriptor, divDescriptors);
+            Assert.Contains(catchAllDescriptor, divDescriptors);
+
+            // For spans
+            Assert.Equal(2, spanDescriptors.Count());
+            Assert.Contains(spanDescriptor, spanDescriptors);
+            Assert.Contains(catchAllDescriptor, spanDescriptors);
+        }
+
+        [Fact]
+        public void TagHelperDescriptorProvider_DuplicateDescriptorsAreNotPartOfTagHelperDescriptorPool()
+        {
+            // Arrange
+            var divDescriptor = new TagHelperDescriptor("div", "foo1", ContentBehavior.None);
+            var descriptors = new TagHelperDescriptor[] { divDescriptor, divDescriptor };
+            var provider = new TagHelperDescriptorProvider(descriptors);
+
+            // Act
+            var retrievedDescriptors = provider.GetTagHelpers("div");
+
+            // Assert
+            var descriptor = Assert.Single(retrievedDescriptors);
+            Assert.Same(divDescriptor, descriptor);
+        }
+    }
+}
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