Test TagHelperScopeManager functionality.

#155

test/Microsoft.AspNet.Razor.Runtime.Test/TagHelpers/TagHelperExecutionContextTest.cs

@@ -7,13 +7,13 @@ using Xunit;
 
 namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
 {
-    public class TagHelpersExecutionContextTest
+    public class TagHelperExecutionContextTest
     {
         [Fact]
         public void AddHtmlAttribute_MaintainsHTMLAttributes()
         {
             // Arrange
-            var executionContext = new TagHelpersExecutionContext("p");
+            var executionContext = new TagHelperExecutionContext("p");
             var expectedAttributes = new Dictionary<string, string>
             {
                 { "class", "btn" },
@@ -29,10 +29,10 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         }
 
         [Fact]
-        public void TagHelpersExecutionContext_MaintainsAllAttributes()
+        public void TagHelperExecutionContext_MaintainsAllAttributes()
         {
             // Arrange
-            var executionContext = new TagHelpersExecutionContext("p");
+            var executionContext = new TagHelperExecutionContext("p");
             var expectedAttributes = new Dictionary<string, object>
             {
                 { "class", "btn" },
@@ -53,7 +53,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         public void Add_MaintainsTagHelpers()
         {
             // Arrange
-            var executionContext = new TagHelpersExecutionContext("p");
+            var executionContext = new TagHelperExecutionContext("p");
             var tagHelper = new PTagHelper();
 
             // Act
@@ -68,7 +68,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         public void Add_MaintainsMultipleTagHelpers()
         {
             // Arrange
-            var executionContext = new TagHelpersExecutionContext("p");
+            var executionContext = new TagHelperExecutionContext("p");
             var tagHelper1 = new PTagHelper();
             var tagHelper2 = new PTagHelper();
 

test/Microsoft.AspNet.Razor.Runtime.Test/TagHelpers/TagHelperRunnerTest.cs

@@ -15,7 +15,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         {
             // Arrange
             var runner = new TagHelperRunner();
-            var executionContext = new TagHelpersExecutionContext("p");
+            var executionContext = new TagHelperExecutionContext("p");
             var executableTagHelper1 = new ExecutableTagHelper();
             var executableTagHelper2 = new ExecutableTagHelper();
 
@@ -34,7 +34,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         {
             // Arrange
             var runner = new TagHelperRunner();
-            var executionContext = new TagHelpersExecutionContext("p");
+            var executionContext = new TagHelperExecutionContext("p");
             var executableTagHelper = new ExecutableTagHelper();
 
             // Act
@@ -54,7 +54,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         {
             // Arrange
             var runner = new TagHelperRunner();
-            var executionContext = new TagHelpersExecutionContext("p");
+            var executionContext = new TagHelperExecutionContext("p");
             var tagHelper = new TagHelperContextTouchingTagHelper();
 
             // Act
@@ -71,7 +71,7 @@ namespace Microsoft.AspNet.Razor.Runtime.TagHelpers
         {
             // Arrange
             var runner = new TagHelperRunner();
-            var executionContext = new TagHelpersExecutionContext("p");
+            var executionContext = new TagHelperExecutionContext("p");
             var tagHelper = new ExecutableTagHelper();
             var contentWriter = new StringWriter(new StringBuilder("Hello World"));
 

test/Microsoft.AspNet.Razor.Runtime.Test/TagHelpers/TagHelperScopeManagerTest.cs

@@ -0,0 +1,91 @@
+// 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;
+using Microsoft.AspNet.Razor.Runtime.TagHelpers;
+using Xunit;
+
+namespace Microsoft.AspNet.Razor.Runtime.Test.TagHelpers
+{
+    public class TagHelperScopeManagerTest
+    {
+        [Fact]
+        public void Begin_CreatesContextWithAppropriateTagName()
+        {
+            // Arrange
+            var scopeManager = new TagHelperScopeManager();
+
+            // Act
+            var executionContext = scopeManager.Begin("p");
+
+            // Assert
+            Assert.Equal("p", executionContext.TagName);
+        }
+
+        [Fact]
+        public void Begin_CanNest()
+        {
+            // Arrange
+            var scopeManager = new TagHelperScopeManager();
+
+            // Act
+            var executionContext = scopeManager.Begin("p");
+            executionContext = scopeManager.Begin("div");
+
+            // Assert
+            Assert.Equal("div", executionContext.TagName);
+        }
+
+        [Fact]
+        public void End_ReturnsParentExecutionContext()
+        {
+            // Arrange
+            var scopeManager = new TagHelperScopeManager();
+
+            // Act
+            var executionContext = scopeManager.Begin("p");
+            executionContext = scopeManager.Begin("div");
+            executionContext = scopeManager.End();
+
+            // Assert
+            Assert.Equal("p", executionContext.TagName);
+        }
+
+        [Fact]
+        public void End_ReturnsNullIfNoNestedContext()
+        {
+            // Arrange
+            var scopeManager = new TagHelperScopeManager();
+
+            // Act
+            var executionContext = scopeManager.Begin("p");
+            executionContext = scopeManager.Begin("div");
+            executionContext = scopeManager.End();
+            executionContext = scopeManager.End();
+
+            // Assert
+            Assert.Null(executionContext);
+        }
+
+        [Fact]
+        public void End_ThrowsIfNoScope()
+        {
+            // Arrange
+            var scopeManager = new TagHelperScopeManager();
+            var expectedError = string.Format(
+                "Must call '{2}.{1}' before calling '{2}.{0}'.",
+                nameof(TagHelperScopeManager.End),
+                nameof(TagHelperScopeManager.Begin),
+                nameof(TagHelperScopeManager));
+
+            // Act & Assert
+            var ex = Assert.Throws<InvalidOperationException>(() =>
+            {
+                scopeManager.End();
+            });
+
+            Assert.Equal(expectedError, ex.Message);
+
+        }
+    }
+}