diff --git a/test/Microsoft.AspNet.Mvc.Razor.Host.Test/MvcRazorHostTest.cs b/test/Microsoft.AspNet.Mvc.Razor.Host.Test/MvcRazorHostTest.cs
index cac8962cb9..210b1ed6bf 100644
--- a/test/Microsoft.AspNet.Mvc.Razor.Host.Test/MvcRazorHostTest.cs
+++ b/test/Microsoft.AspNet.Mvc.Razor.Host.Test/MvcRazorHostTest.cs
@@ -3,8 +3,11 @@
 
 using System.Collections.Generic;
 using System.IO;
+using Microsoft.AspNet.FileSystems;
 using Microsoft.AspNet.Razor;
+using Microsoft.AspNet.Razor.Generator;
 using Microsoft.AspNet.Razor.Generator.Compiler;
+using Microsoft.AspNet.Razor.Generator.Compiler.CSharp;
 using Microsoft.AspNet.Razor.Text;
 using Xunit;
 
@@ -66,7 +69,7 @@ namespace Microsoft.AspNet.Mvc.Razor
         public void MvcRazorHost_ParsesAndGeneratesCodeForBasicScenarios(string scenarioName)
         {
             // Arrange
-            var host = new MvcRazorHost(new TestFileSystem());
+            var host = new TestMvcRazorHost(new TestFileSystem());
 
             // Act and Assert
             RunRuntimeTest(host, scenarioName);
@@ -205,5 +208,68 @@ namespace Microsoft.AspNet.Mvc.Razor
                 documentLocation: new MappingLocation(documentLocation, contentLength),
                 generatedLocation: new MappingLocation(generatedLocation, contentLength));
         }
+
+        /// <summary>
+        /// Used when testing Tag Helpers, it disables the unique ID generation feature.
+        /// </summary>
+        private class TestMvcRazorHost : MvcRazorHost
+        {
+            public TestMvcRazorHost(IFileSystem fileSystem)
+                : base(fileSystem)
+            { }
+
+            public override CodeBuilder DecorateCodeBuilder(CodeBuilder incomingBuilder, CodeBuilderContext context)
+            {
+                base.DecorateCodeBuilder(incomingBuilder, context);
+
+                return new TestCSharpCodeBuilder(context,
+                                                 DefaultModel,
+                                                 ActivateAttribute,
+                                                 new GeneratedTagHelperAttributeContext
+                                                 {
+                                                     ModelExpressionTypeName = ModelExpressionType,
+                                                     CreateModelExpressionMethodName = CreateModelExpressionMethod
+                                                 });
+            }
+
+            protected class TestCSharpCodeBuilder : MvcCSharpCodeBuilder
+            {
+                private readonly GeneratedTagHelperAttributeContext _tagHelperAttributeContext;
+
+                public TestCSharpCodeBuilder(CodeBuilderContext context,
+                                             string defaultModel,
+                                             string activateAttribute,
+                                             GeneratedTagHelperAttributeContext tagHelperAttributeContext)
+                    : base(context, defaultModel, activateAttribute, tagHelperAttributeContext)
+                {
+                    _tagHelperAttributeContext = tagHelperAttributeContext;
+                }
+
+                protected override CSharpCodeVisitor CreateCSharpCodeVisitor(CSharpCodeWriter writer, CodeBuilderContext context)
+                {
+                    var visitor = base.CreateCSharpCodeVisitor(writer, context);
+                    visitor.TagHelperRenderer = new NoUniqueIdsTagHelperCodeRenderer(visitor, writer, context)
+                    {
+                        AttributeValueCodeRenderer =
+                            new MvcTagHelperAttributeValueCodeRenderer(_tagHelperAttributeContext)
+                    };
+                    return visitor;
+                }
+
+                private class NoUniqueIdsTagHelperCodeRenderer : CSharpTagHelperCodeRenderer
+                {
+                    public NoUniqueIdsTagHelperCodeRenderer(IChunkVisitor bodyVisitor,
+                                                            CSharpCodeWriter writer,
+                                                            CodeBuilderContext context)
+                        : base(bodyVisitor, writer, context)
+                    { }
+
+                    protected override string GenerateUniqueId()
+                    {
+                        return "test";
+                    }
+                }
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/test/Microsoft.AspNet.Mvc.Razor.Host.Test/TestFiles/Output/Runtime/ModelExpressionTagHelper.cs b/test/Microsoft.AspNet.Mvc.Razor.Host.Test/TestFiles/Output/Runtime/ModelExpressionTagHelper.cs
index 581614783e..1bcafcc482 100644
--- a/test/Microsoft.AspNet.Mvc.Razor.Host.Test/TestFiles/Output/Runtime/ModelExpressionTagHelper.cs
+++ b/test/Microsoft.AspNet.Mvc.Razor.Host.Test/TestFiles/Output/Runtime/ModelExpressionTagHelper.cs
@@ -43,7 +43,7 @@ namespace Asp
             BeginContext(120, 2, true);
             WriteLiteral("\r\n");
             EndContext();
-            __tagHelperExecutionContext = __tagHelperScopeManager.Begin("inputTest");
+            __tagHelperExecutionContext = __tagHelperScopeManager.Begin("inputTest", "test");
             __Microsoft_AspNet_Mvc_Razor_InputTestTagHelper = CreateTagHelper<Microsoft.AspNet.Mvc.Razor.InputTestTagHelper>();
             __tagHelperExecutionContext.Add(__Microsoft_AspNet_Mvc_Razor_InputTestTagHelper);
             __Microsoft_AspNet_Mvc_Razor_InputTestTagHelper.For = CreateModelExpression(__model => __model.Now);
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/AnchorTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/AnchorTagHelperTest.cs
index 92ed100dcb..56427a00b7 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/AnchorTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/AnchorTagHelperTest.cs
@@ -31,7 +31,8 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                     { "asp-fragment", "hello=world" },
                     { "asp-host", "contoso.com" },
                     { "asp-protocol", "http" }
-                });
+                },
+                uniqueId: "test");
             var output = new TagHelperOutput(
                 expectedTagName,
                 attributes: new Dictionary<string, string>
@@ -84,7 +85,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
         {
             // Arrange
             var context = new TagHelperContext(
-                allAttributes: new Dictionary<string, object>());
+                allAttributes: new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(
                 "a",
                 attributes: new Dictionary<string, string>(),
@@ -118,7 +119,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
         {
             // Arrange
             var context = new TagHelperContext(
-                allAttributes: new Dictionary<string, object>());
+                allAttributes: new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(
                 "a",
                 attributes: new Dictionary<string, string>(),
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/FormTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/FormTagHelperTest.cs
index 82858c9991..9b604ff1f8 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/FormTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/FormTagHelperTest.cs
@@ -32,7 +32,8 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                     { "asp-controller", "home" },
                     { "method", "post" },
                     { "asp-anti-forgery", true }
-                });
+                },
+                uniqueId: "test");
             var output = new TagHelperOutput(
                 expectedTagName,
                 attributes: new Dictionary<string, string>
@@ -91,7 +92,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             // Arrange
             var viewContext = CreateViewContext();
             var context = new TagHelperContext(
-                allAttributes: new Dictionary<string, object>());
+                allAttributes: new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(
                 "form",
                 attributes: new Dictionary<string, string>(),
@@ -132,7 +133,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             // Arrange
             var testViewContext = CreateViewContext();
             var context = new TagHelperContext(
-                allAttributes: new Dictionary<string, object>());
+                allAttributes: new Dictionary<string, object>(), uniqueId: "test");
             var expectedAttribute = new KeyValuePair<string, string>("asp-ROUTEE-NotRoute", "something");
             var output = new TagHelperOutput(
                 "form",
@@ -193,7 +194,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             // Arrange
             var viewContext = CreateViewContext();
             var context = new TagHelperContext(
-                allAttributes: new Dictionary<string, object>());
+                allAttributes: new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(
                 "form",
                 attributes: new Dictionary<string, string>(),
@@ -243,7 +244,8 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 allAttributes: new Dictionary<string, object>()
                 {
                     { "METhod", "POST" }
-                });
+                },
+                uniqueId: "test");
 
             // Act
             await formTagHelper.ProcessAsync(context, output);
@@ -284,7 +286,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                                                  { "aCTiON", "my-action" },
                                              },
                                              content: string.Empty);
-            var context = new TagHelperContext(allAttributes: new Dictionary<string, object>());
+            var context = new TagHelperContext(allAttributes: new Dictionary<string, object>(), uniqueId: "test");
 
             // Act
             await formTagHelper.ProcessAsync(context, output);
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/InputTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/InputTagHelperTest.cs
index 4124a5a7cd..ac62d6a1e7 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/InputTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/InputTagHelperTest.cs
@@ -92,7 +92,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = "original content";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(new Dictionary<string, object>());
+            var context = new TagHelperContext(new Dictionary<string, object>(), uniqueId: "test");
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -137,7 +137,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var originalTagName = "not-input";
             var expectedContent = originalContent + "<input class=\"form-control\" /><hidden />";
 
-            var context = new TagHelperContext(allAttributes: new Dictionary<string, object>());
+            var context = new TagHelperContext(allAttributes: new Dictionary<string, object>(), uniqueId: "test");
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -217,7 +217,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = "something";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(allAttributes: contextAttributes);
+            var context = new TagHelperContext(allAttributes: contextAttributes, uniqueId: "test");
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -294,7 +294,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = "something";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(allAttributes: contextAttributes);
+            var context = new TagHelperContext(allAttributes: contextAttributes, uniqueId: "test");
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -368,7 +368,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = "something";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(allAttributes: contextAttributes);
+            var context = new TagHelperContext(allAttributes: contextAttributes, uniqueId: "test");
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -457,7 +457,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = "something";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(allAttributes: contextAttributes);
+            var context = new TagHelperContext(allAttributes: contextAttributes, uniqueId: "test");
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -515,7 +515,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = "original content";
             var expectedTagName = "input";
 
-            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>());
+            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, expectedAttributes, expectedContent)
             {
                 SelfClosing = false,
@@ -563,7 +563,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedMessage = "Unable to format without a 'asp-for' expression for <input>. 'asp-format' must " +
                 "be null if 'asp-for' is null.";
 
-            var tagHelperContext = new TagHelperContext(contextAttributes);
+            var tagHelperContext = new TagHelperContext(contextAttributes, uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, originalAttributes, content);
             var tagHelper = new InputTagHelper
             {
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LabelTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LabelTagHelperTest.cs
index 892b793511..ebce192391 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LabelTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LabelTagHelperTest.cs
@@ -113,7 +113,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 For = modelExpression,
             };
 
-            var tagHelperContext = new TagHelperContext(allAttributes: new Dictionary<string, object>());
+            var tagHelperContext = new TagHelperContext(allAttributes: new Dictionary<string, object>(), uniqueId: "test");
             var htmlAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -153,7 +153,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var modelExpression = new ModelExpression(nameof(Model.Text), metadata);
             var tagHelper = new LabelTagHelper();
 
-            var tagHelperContext = new TagHelperContext(allAttributes: new Dictionary<string, object>());
+            var tagHelperContext = new TagHelperContext(allAttributes: new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, expectedAttributes, expectedContent);
 
             var htmlGenerator = new TestableHtmlGenerator(metadataProvider);
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/OptionTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/OptionTagHelperTest.cs
index 72d83f837f..24ceea9704 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/OptionTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/OptionTagHelperTest.cs
@@ -136,7 +136,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 { "selected", selected },
                 { "value", value },
             };
-            var tagHelperContext = new TagHelperContext(contextAttributes);
+            var tagHelperContext = new TagHelperContext(contextAttributes, uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, originalAttributes, originalContent)
             {
                 SelfClosing = false,
@@ -188,7 +188,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 { "selected", selected },
                 { "value", value },
             };
-            var tagHelperContext = new TagHelperContext(contextAttributes);
+            var tagHelperContext = new TagHelperContext(contextAttributes, uniqueId: "test");
             var output = new TagHelperOutput(originalTagName, originalAttributes, originalContent)
             {
                 SelfClosing = false,
@@ -235,7 +235,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 { "selected", selected },
                 { "value", value },
             };
-            var tagHelperContext = new TagHelperContext(contextAttributes);
+            var tagHelperContext = new TagHelperContext(contextAttributes, uniqueId: "test");
             var output = new TagHelperOutput(originalTagName, originalAttributes, originalContent)
             {
                 SelfClosing = false,
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/SelectTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/SelectTagHelperTest.cs
index b19e01f6b0..9793d7c088 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/SelectTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/SelectTagHelperTest.cs
@@ -182,7 +182,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var metadata = metadataProvider.GetMetadataForProperty(modelAccessor, containerType, propertyName: "Text");
             var modelExpression = new ModelExpression(nameAndId.Name, metadata);
 
-            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>());
+            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, originalAttributes, expectedContent)
             {
                 SelfClosing = true,
@@ -252,7 +252,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var metadata = metadataProvider.GetMetadataForProperty(modelAccessor, containerType, propertyName: "Text");
             var modelExpression = new ModelExpression(nameAndId.Name, metadata);
 
-            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>());
+            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, originalAttributes, originalContent)
             {
                 SelfClosing = true,
@@ -312,7 +312,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var propertyName = "Property1";
             var expectedTagName = "select";
 
-            var tagHelperContext = new TagHelperContext(contextAttributes);
+            var tagHelperContext = new TagHelperContext(contextAttributes, uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, originalAttributes, content);
 
             // TODO: https://github.com/aspnet/Mvc/issues/1253
@@ -376,7 +376,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var propertyName = "Property1";
             var tagName = "select";
 
-            var tagHelperContext = new TagHelperContext(contextAttributes);
+            var tagHelperContext = new TagHelperContext(contextAttributes, uniqueId: "test");
             var output = new TagHelperOutput(tagName, originalAttributes, content);
 
             var metadataProvider = new EmptyModelMetadataProvider();
@@ -440,7 +440,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = "original content";
             var expectedTagName = "select";
 
-            var tagHelperContext = new TagHelperContext(contextAttributes);
+            var tagHelperContext = new TagHelperContext(contextAttributes, uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, originalAttributes, expectedContent)
             {
                 SelfClosing = true,
@@ -471,7 +471,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedTagName = "select";
             var expectedMessage = "Cannot determine body for <select>. 'asp-items' must be null if 'asp-for' is null.";
 
-            var tagHelperContext = new TagHelperContext(contextAttributes);
+            var tagHelperContext = new TagHelperContext(contextAttributes, uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, originalAttributes, content);
             var tagHelper = new SelectTagHelper
             {
@@ -502,7 +502,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedMessage = "Cannot parse 'multiple' value '" + multiple +
                 "' for <select>. Acceptable values are 'false', 'true' and 'multiple'.";
 
-            var tagHelperContext = new TagHelperContext(contextAttributes);
+            var tagHelperContext = new TagHelperContext(contextAttributes, uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, originalAttributes, content);
 
             var metadataProvider = new EmptyModelMetadataProvider();
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TagHelperOutputExtensionsTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TagHelperOutputExtensionsTest.cs
index 49dd211966..ba0a980c95 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TagHelperOutputExtensionsTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TagHelperOutputExtensionsTest.cs
@@ -25,7 +25,8 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 new Dictionary<string, object>(StringComparer.Ordinal)
                 {
                     { attributeName, attributeValue }
-                });
+                },
+                uniqueId: "test");
             var expectedAttribute = new KeyValuePair<string, string>(attributeName, attributeValue);
 
             // Act
@@ -53,7 +54,8 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 new Dictionary<string, object>(StringComparer.Ordinal)
                 {
                     { attributeName, "world" }
-                });
+                }
+                , uniqueId: "test");
 
             // Act
             tagHelperOutput.CopyHtmlAttribute(attributeName, tagHelperContext);
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TextAreaTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TextAreaTagHelperTest.cs
index 74956ea0d6..1b098e9e04 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TextAreaTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TextAreaTagHelperTest.cs
@@ -107,7 +107,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 For = modelExpression,
             };
 
-            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>());
+            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>(), uniqueId: "test");
             var htmlAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -157,7 +157,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var modelExpression = new ModelExpression(nameof(Model.Text), metadata);
             var tagHelper = new TextAreaTagHelper();
 
-            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>());
+            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(expectedTagName, expectedAttributes, expectedContent)
             {
                 SelfClosing = true,
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationMessageTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationMessageTagHelperTest.cs
index b0290add45..e7a22d90ab 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationMessageTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationMessageTagHelperTest.cs
@@ -33,7 +33,8 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 {
                     { "id", "myvalidationmessage" },
                     { "for", modelExpression },
-                });
+                },
+                uniqueId: "test");
             var output = new TagHelperOutput(
                 expectedTagName,
                 attributes: new Dictionary<string, string>
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs
index 8f5e06cfcd..bfbd4f6e6e 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs
@@ -28,7 +28,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 ValidationSummaryValue = "All"
             };
 
-            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>());
+            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>(), uniqueId: "test");
             var output = new TagHelperOutput(
                 expectedTagName,
                 attributes: new Dictionary<string, string>