diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/AnchorTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/AnchorTagHelperTest.cs
index 816ebce022..f9034d0e60 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/AnchorTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/AnchorTagHelperTest.cs
@@ -32,6 +32,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                     { "asp-host", "contoso.com" },
                     { "asp-protocol", "http" }
                 },
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something Else"));
             var output = new TagHelperOutput(
@@ -82,6 +83,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             // Arrange
             var context = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(
@@ -120,14 +122,15 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             // Arrange
             var context = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(
                 "a",
                 attributes: new Dictionary<string, string>())
-                {
-                    Content = string.Empty
-                };
+            {
+                Content = string.Empty
+            };
 
             var generator = new Mock<IHtmlGenerator>();
             generator
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/CacheTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/CacheTagHelperTest.cs
index 8b91ecac88..5f142effdb 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/CacheTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/CacheTagHelperTest.cs
@@ -702,18 +702,20 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = "some-content";
             var tokenSource = new CancellationTokenSource();
             var cache = new MemoryCache(new MemoryCacheOptions());
-            var tagHelperContext = new TagHelperContext(new Dictionary<string, object>(),
-                                        id,
-                                        () =>
-                                        {
-                                            var entryLink = EntryLinkHelpers.ContextLink;
-                                            Assert.NotNull(entryLink);
-                                            entryLink.AddExpirationTriggers(new[]
-                                            {
-                                                new CancellationTokenTrigger(tokenSource.Token)
-                                            });
-                                            return Task.FromResult(expectedContent);
-                                        });
+            var tagHelperContext = new TagHelperContext(
+                allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
+                uniqueId: id,
+                getChildContentAsync: () =>
+                {
+                    var entryLink = EntryLinkHelpers.ContextLink;
+                    Assert.NotNull(entryLink);
+                    entryLink.AddExpirationTriggers(new[]
+                    {
+                        new CancellationTokenTrigger(tokenSource.Token)
+                    });
+                    return Task.FromResult(expectedContent);
+                });
             var tagHelperOutput = new TagHelperOutput("cache", new Dictionary<string, string>())
             {
                 PreContent = "<cache>",
@@ -757,9 +759,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
         private static TagHelperContext GetTagHelperContext(string id = "testid",
                                                             string childContent = "some child content")
         {
-            return new TagHelperContext(new Dictionary<string, object>(),
-                                        id,
-                                        () => Task.FromResult(childContent));
+            return new TagHelperContext(
+                allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
+                uniqueId: id,
+                getChildContentAsync: () => Task.FromResult(childContent));
         }
 
         private static string GetHashedBytes(string input)
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/EnvironmentTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/EnvironmentTagHelperTest.cs
index 455928c5c7..3082cf0113 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/EnvironmentTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/EnvironmentTagHelperTest.cs
@@ -134,13 +134,17 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Test
         {
             attributes = attributes ?? new Dictionary<string, object>();
 
-            return new TagHelperContext(attributes, Guid.NewGuid().ToString("N"), () => Task.FromResult(content));
+            return new TagHelperContext(
+                attributes,
+                items: new Dictionary<object, object>(),
+                uniqueId: Guid.NewGuid().ToString("N"),
+                getChildContentAsync: () => Task.FromResult(content));
         }
 
         private TagHelperOutput MakeTagHelperOutput(string tagName, IDictionary<string, string> attributes = null)
         {
             attributes = attributes ?? new Dictionary<string, string>();
-            
+
             return new TagHelperOutput(tagName, attributes);
         }
     }
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/FormTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/FormTagHelperTest.cs
index 61fdba839d..e85d04a66e 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/FormTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/FormTagHelperTest.cs
@@ -33,6 +33,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                     { "method", "post" },
                     { "asp-anti-forgery", true }
                 },
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something Else"));
             var output = new TagHelperOutput(
@@ -92,6 +93,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var viewContext = CreateViewContext();
             var context = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(
@@ -137,6 +139,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var testViewContext = CreateViewContext();
             var context = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var expectedAttribute = new KeyValuePair<string, string>("asp-ROUTEE-NotRoute", "something");
@@ -202,6 +205,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var viewContext = CreateViewContext();
             var context = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(
@@ -256,6 +260,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 {
                     { "METhod", "POST" }
                 },
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
 
@@ -302,6 +307,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                                              });
             var context = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
 
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/InputTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/InputTagHelperTest.cs
index 0bcfb411a4..18a0bd9733 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/InputTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/InputTagHelperTest.cs
@@ -94,9 +94,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedPostContent = "original post-content";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(allAttributes: new Dictionary<string, object>(),
-                                               uniqueId: "test",
-                                               getChildContentAsync: () => Task.FromResult("Something"));
+            var context = new TagHelperContext(
+                allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
+                uniqueId: "test",
+                getChildContentAsync: () => Task.FromResult("Something"));
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -148,9 +150,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = originalContent + "<input class=\"form-control\" /><hidden />";
             var expectedPostContent = "original post-content";
 
-            var context = new TagHelperContext(allAttributes: new Dictionary<string, object>(),
-                                               uniqueId: "test",
-                                               getChildContentAsync: () => Task.FromResult("Something"));
+            var context = new TagHelperContext(
+                allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
+                uniqueId: "test",
+                getChildContentAsync: () => Task.FromResult("Something"));
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -237,9 +241,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedPostContent = "original post-content";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(allAttributes: contextAttributes,
-                                               uniqueId: "test",
-                                               getChildContentAsync: () => Task.FromResult("Something"));
+            var context = new TagHelperContext(
+                allAttributes: contextAttributes,
+                items: new Dictionary<object, object>(),
+                uniqueId: "test",
+                getChildContentAsync: () => Task.FromResult("Something"));
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -323,9 +329,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedPostContent = "original post-content";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(allAttributes: contextAttributes,
-                                               uniqueId: "test",
-                                               getChildContentAsync: () => Task.FromResult("Something"));
+            var context = new TagHelperContext(
+                allAttributes: contextAttributes,
+                items: new Dictionary<object, object>(),
+                uniqueId: "test",
+                getChildContentAsync: () => Task.FromResult("Something"));
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -406,9 +414,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedPostContent = "original post-content";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(allAttributes: contextAttributes,
-                                               uniqueId: "test",
-                                               getChildContentAsync: () => Task.FromResult("Something"));
+            var context = new TagHelperContext(
+                allAttributes: contextAttributes,
+                items: new Dictionary<object, object>(),
+                uniqueId: "test",
+                getChildContentAsync: () => Task.FromResult("Something"));
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -504,9 +514,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedPostContent = "original post-content";
             var expectedTagName = "not-input";
 
-            var context = new TagHelperContext(allAttributes: contextAttributes,
-                                               uniqueId: "test",
-                                               getChildContentAsync: () => Task.FromResult("Something"));
+            var context = new TagHelperContext(
+                allAttributes: contextAttributes,
+                items: new Dictionary<object, object>(),
+                uniqueId: "test",
+                getChildContentAsync: () => Task.FromResult("Something"));
             var originalAttributes = new Dictionary<string, string>
             {
                 { "class", "form-control" },
@@ -573,6 +585,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(expectedTagName, expectedAttributes)
@@ -628,6 +641,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(expectedTagName, originalAttributes);
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/Internal/AttributeMatcherTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/Internal/AttributeMatcherTest.cs
index 964e820464..054a51446e 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/Internal/AttributeMatcherTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/Internal/AttributeMatcherTest.cs
@@ -15,7 +15,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
         public void DetermineMode_FindsFullModeMatchWithSingleAttribute()
         {
             // Arrange
-            var modeInfo = new []
+            var modeInfo = new[]
             {
                 ModeAttributes.Create("mode0", new [] { "first-attr" })
             };
@@ -124,7 +124,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers.Internal
         {
             attributes = attributes ?? new Dictionary<string, object>();
 
-            return new TagHelperContext(attributes, Guid.NewGuid().ToString("N"), () => Task.FromResult(content));
+            return new TagHelperContext(
+                attributes,
+                items: new Dictionary<object, object>(),
+                uniqueId: Guid.NewGuid().ToString("N"),
+                getChildContentAsync: () => Task.FromResult(content));
         }
     }
 }
\ No newline at end of file
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LabelTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LabelTagHelperTest.cs
index b3b0accf7f..9725486e43 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LabelTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LabelTagHelperTest.cs
@@ -183,6 +183,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult(tagHelperOutputContent.OriginalChildContent));
             var htmlAttributes = new Dictionary<string, string>
@@ -242,6 +243,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(expectedTagName, expectedAttributes)
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LinkTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LinkTagHelperTest.cs
index 76d481bd0f..eb405d9dd5 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LinkTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/LinkTagHelperTest.cs
@@ -337,7 +337,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
         {
             attributes = attributes ?? new Dictionary<string, object>();
 
-            return new TagHelperContext(attributes, Guid.NewGuid().ToString("N"), () => Task.FromResult(content));
+            return new TagHelperContext(
+                attributes,
+                items: new Dictionary<object, object>(),
+                uniqueId: Guid.NewGuid().ToString("N"),
+                getChildContentAsync: () => Task.FromResult(content));
         }
 
         private static TagHelperOutput MakeTagHelperOutput(string tagName, IDictionary<string, string> attributes = null)
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/OptionTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/OptionTagHelperTest.cs
index d5089f4024..ce1883f77b 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/OptionTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/OptionTagHelperTest.cs
@@ -138,6 +138,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             };
             var tagHelperContext = new TagHelperContext(
                 contextAttributes,
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult(originalContent));
             var output = new TagHelperOutput(expectedTagName, originalAttributes)
@@ -196,6 +197,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var originalPostContent = "original post-content";
             var tagHelperContext = new TagHelperContext(
                 contextAttributes,
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult(originalContent));
             var output = new TagHelperOutput(originalTagName, originalAttributes)
@@ -251,6 +253,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var originalPostContent = "original post-content";
             var tagHelperContext = new TagHelperContext(
                 contextAttributes,
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult(originalContent));
             var output = new TagHelperOutput(originalTagName, originalAttributes)
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ScriptTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ScriptTagHelperTest.cs
index 1a4db7a6a8..c8f4b5e0d5 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ScriptTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ScriptTagHelperTest.cs
@@ -244,7 +244,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
         {
             attributes = attributes ?? new Dictionary<string, object>();
 
-            return new TagHelperContext(attributes, Guid.NewGuid().ToString("N"), () => Task.FromResult(content));
+            return new TagHelperContext(
+                attributes,
+                items: new Dictionary<object, object>(),
+                uniqueId: Guid.NewGuid().ToString("N"),
+                getChildContentAsync: () => Task.FromResult(content));
         }
 
         private TagHelperOutput MakeTagHelperOutput(string tagName, IDictionary<string, string> attributes = null)
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/SelectTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/SelectTagHelperTest.cs
index a2e61fe384..4400888793 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/SelectTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/SelectTagHelperTest.cs
@@ -196,6 +196,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(expectedTagName, originalAttributes)
@@ -276,6 +277,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(expectedTagName, originalAttributes)
@@ -358,6 +360,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 contextAttributes,
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(expectedTagName, originalAttributes);
@@ -423,6 +426,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 contextAttributes,
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(tagName, originalAttributes);
@@ -478,6 +482,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 contextAttributes,
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(expectedTagName, originalAttributes);
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TagHelperOutputExtensionsTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TagHelperOutputExtensionsTest.cs
index cc7ad9fa4b..ef2ab072fc 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TagHelperOutputExtensionsTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TagHelperOutputExtensionsTest.cs
@@ -26,6 +26,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 {
                     { attributeName, attributeValue }
                 },
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var expectedAttribute = new KeyValuePair<string, string>(attributeName, attributeValue);
@@ -55,6 +56,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 {
                     { attributeName, "world" }
                 },
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
 
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TextAreaTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TextAreaTagHelperTest.cs
index d026563165..581e5a2676 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TextAreaTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/TextAreaTagHelperTest.cs
@@ -109,6 +109,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var htmlAttributes = new Dictionary<string, string>
@@ -165,6 +166,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
 
             var tagHelperContext = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(expectedTagName, expectedAttributes)
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationMessageTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationMessageTagHelperTest.cs
index 29bfa1b599..6b9532ffaa 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationMessageTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationMessageTagHelperTest.cs
@@ -38,6 +38,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                     { "id", "myvalidationmessage" },
                     { "for", modelExpression },
                 },
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(
@@ -90,6 +91,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedPostContent = "original post-content";
             var context = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(
@@ -140,9 +142,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 Content = outputContent
             };
 
-            var context = new TagHelperContext(allAttributes: new Dictionary<string, object>(),
-                                               uniqueId: "test",
-                                               getChildContentAsync: () => Task.FromResult(childContent));
+            var context = new TagHelperContext(
+                allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
+                uniqueId: "test",
+                getChildContentAsync: () => Task.FromResult(childContent));
             var tagBuilder = new TagBuilder("span2")
             {
                 InnerHtml = "New HTML"
@@ -191,9 +195,11 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
                 "span",
                 attributes: new Dictionary<string, string>());
 
-            var context = new TagHelperContext(allAttributes: new Dictionary<string, object>(),
-                                               uniqueId: "test",
-                                               getChildContentAsync: () => Task.FromResult(childContent));
+            var context = new TagHelperContext(
+                allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
+                uniqueId: "test",
+                getChildContentAsync: () => Task.FromResult(childContent));
             var tagBuilder = new TagBuilder("span2")
             {
                 InnerHtml = "New HTML"
diff --git a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs
index 5cfeddef10..fe361c1866 100644
--- a/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs
+++ b/test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs
@@ -44,6 +44,7 @@ namespace Microsoft.AspNet.Mvc.TagHelpers
             var expectedContent = "original content";
             var tagHelperContext = new TagHelperContext(
                 allAttributes: new Dictionary<string, object>(),
+                items: new Dictionary<object, object>(),
                 uniqueId: "test",
                 getChildContentAsync: () => Task.FromResult("Something"));
             var output = new TagHelperOutput(