diff --git a/test/Microsoft.AspNet.Mvc.IntegrationTests/ValidationIntegrationTests.cs b/test/Microsoft.AspNet.Mvc.IntegrationTests/ValidationIntegrationTests.cs
new file mode 100644
index 0000000000..fa25f866bc
--- /dev/null
+++ b/test/Microsoft.AspNet.Mvc.IntegrationTests/ValidationIntegrationTests.cs
@@ -0,0 +1,473 @@
+// 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.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Mvc.ModelBinding;
+using Xunit;
+
+namespace Microsoft.AspNet.Mvc.IntegrationTests
+{
+    public class ValidationIntegrationTests
+    {
+        private class Order1
+        {
+            [Required]
+            public string CustomerName { get; set; }
+        }
+
+        [Fact(Skip = "Extra ModelState key because of #2446")]
+        public async Task Validation_RequiredAttribute_OnSimpleTypeProperty_WithData()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(Order1)
+            };
+            
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                request.QueryString = new QueryString("?parameter.CustomerName=bill");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<Order1>(modelBindingResult.Model);
+            Assert.Equal("bill", model.CustomerName);
+
+            Assert.Equal(1, modelState.Count); // This fails due to #2446
+            Assert.Equal(0, modelState.ErrorCount);
+            Assert.True(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "parameter.CustomerName").Value;
+            Assert.Equal("bill", entry.Value.AttemptedValue);
+            Assert.Equal("bill", entry.Value.RawValue);
+            Assert.Empty(entry.Errors);
+        }
+
+        [Fact(Skip = "Extra ModelState key because of #2446")]
+        public async Task Validation_RequiredAttribute_OnSimpleTypeProperty_NoData()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(Order1)
+            };
+
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                request.QueryString = new QueryString("?");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<Order1>(modelBindingResult.Model);
+            Assert.Null(model.CustomerName);
+
+            Assert.Equal(1, modelState.Count); // This fails due to #2446
+            Assert.Equal(1, modelState.ErrorCount);
+            Assert.False(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "CustomerName").Value;
+            Assert.Null(entry.Value);
+            Assert.Equal(ModelValidationState.Invalid, entry.ValidationState);
+
+            var error = Assert.Single(entry.Errors);
+            AssertRequiredError("CustomerName", error);
+        }
+
+
+
+        private class Order2
+        {
+            [Required]
+            public Person2 Customer { get; set; }
+        }
+
+        private class Person2
+        {
+            public string Name { get; set; }
+        }
+
+        [Fact(Skip = "Extra ModelState key because of #2446")]
+        public async Task Validation_RequiredAttribute_OnPOCOProperty_WithData()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(Order2)
+            };
+
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                request.QueryString = new QueryString("?parameter.Customer.Name=bill");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<Order2>(modelBindingResult.Model);
+            Assert.NotNull(model.Customer);
+            Assert.Equal("bill", model.Customer.Name);
+
+            Assert.Equal(1, modelState.Count); // This fails due to #2446
+            Assert.Equal(0, modelState.ErrorCount);
+            Assert.True(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "parameter.Customer.Name").Value;
+            Assert.Equal("bill", entry.Value.AttemptedValue);
+            Assert.Equal("bill", entry.Value.RawValue);
+            Assert.Empty(entry.Errors);
+        }
+
+        [Fact]
+        public async Task Validation_RequiredAttribute_OnPOCOProperty_NoData()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(Order2)
+            };
+
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                request.QueryString = new QueryString("?");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<Order2>(modelBindingResult.Model);
+            Assert.Null(model.Customer);
+
+            Assert.Equal(1, modelState.Count);
+            Assert.Equal(1, modelState.ErrorCount);
+            Assert.False(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "Customer").Value;
+            Assert.Null(entry.Value);
+            Assert.Equal(ModelValidationState.Invalid, entry.ValidationState);
+
+            var error = Assert.Single(entry.Errors);
+            AssertRequiredError("Customer", error);
+        }
+
+        private class Order3
+        {
+            public Person3 Customer { get; set; }
+        }
+
+        private class Person3
+        {
+            public int Age { get; set; }
+
+            [Required]
+            public string Name { get; set; }
+        }
+
+        [Fact(Skip = "Extra ModelState key because of #2446")]
+        public async Task Validation_RequiredAttribute_OnNestedSimpleTypeProperty_WithData()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(Order3)
+            };
+
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                request.QueryString = new QueryString("?parameter.Customer.Name=bill");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<Order3>(modelBindingResult.Model);
+            Assert.NotNull(model.Customer);
+            Assert.Equal("bill", model.Customer.Name);
+
+            Assert.Equal(1, modelState.Count); // This fails due to #2446
+            Assert.Equal(0, modelState.ErrorCount);
+            Assert.True(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "parameter.Customer.Name").Value;
+            Assert.Equal("bill", entry.Value.AttemptedValue);
+            Assert.Equal("bill", entry.Value.RawValue);
+            Assert.Empty(entry.Errors);
+        }
+
+        [Fact(Skip = "Extra ModelState key because of #2446")]
+        public async Task Validation_RequiredAttribute_OnNestedSimpleTypeProperty_NoDataForRequiredProperty()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(Order3)
+            };
+
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                // Force creation of the Customer model.
+                request.QueryString = new QueryString("?parameter.Customer.Age=17");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<Order3>(modelBindingResult.Model);
+            Assert.NotNull(model.Customer);
+            Assert.Equal(17, model.Customer.Age);
+            Assert.Null(model.Customer.Name);
+
+            Assert.Equal(2, modelState.Count); // This fails due to #2446
+            Assert.Equal(1, modelState.ErrorCount);
+            Assert.False(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "parameter.Customer.Name").Value;
+            Assert.Null(entry.Value);
+            Assert.Equal(ModelValidationState.Invalid, entry.ValidationState);
+
+            var error = Assert.Single(entry.Errors);
+            AssertRequiredError("Name", error);
+        }
+
+        private class Order4
+        {
+            [Required]
+            public List<Item4> Items { get; set; }
+        }
+
+        private class Item4
+        {
+            public int ItemId { get; set; }
+        }
+
+        [Fact(Skip = "Extra ModelState key because of #2446")]
+        public async Task Validation_RequiredAttribute_OnCollectionProperty_WithData()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(Order4)
+            };
+
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                request.QueryString = new QueryString("?Items[0].ItemId=17");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<Order4>(modelBindingResult.Model);
+            Assert.NotNull(model.Items);
+            Assert.Equal(17, Assert.Single(model.Items).ItemId);
+
+            Assert.Equal(1, modelState.Count); // This fails due to #2446
+            Assert.Equal(0, modelState.ErrorCount);
+            Assert.True(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "Items[0].ItemId").Value;
+            Assert.Equal("17", entry.Value.AttemptedValue);
+            Assert.Equal("17", entry.Value.RawValue);
+            Assert.Empty(entry.Errors);
+        }
+
+        [Fact]
+        public async Task Validation_RequiredAttribute_OnCollectionProperty_NoData()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(Order4)
+            };
+
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                // Force creation of the Customer model.
+                request.QueryString = new QueryString("?");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<Order4>(modelBindingResult.Model);
+            Assert.Null(model.Items);
+
+            Assert.Equal(1, modelState.Count);
+            Assert.Equal(1, modelState.ErrorCount);
+            Assert.False(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "Items").Value;
+            Assert.Null(entry.Value);
+            Assert.Equal(ModelValidationState.Invalid, entry.ValidationState);
+
+            var error = Assert.Single(entry.Errors);
+            AssertRequiredError("Items", error);
+        }
+
+        private class Order5
+        {
+            [Required]
+            public int? ProductId { get; set; }
+
+            public string Name { get; set; }
+        }
+
+        [Fact(Skip = "Extra ModelState key because of #2446")]
+        public async Task Validation_RequiredAttribute_OnPOCOPropertyOfBoundElement_WithData()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(List<Order5>)
+            };
+
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                request.QueryString = new QueryString("?parameter[0].ProductId=17");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<List<Order5>>(modelBindingResult.Model);
+            Assert.Equal(17, Assert.Single(model).ProductId);
+
+            Assert.Equal(1, modelState.Count); // This fails due to #2446
+            Assert.Equal(0, modelState.ErrorCount);
+            Assert.True(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "parameter[0].ProductId").Value;
+            Assert.Equal("17", entry.Value.AttemptedValue);
+            Assert.Equal("17", entry.Value.RawValue);
+            Assert.Empty(entry.Errors);
+        }
+
+        [Fact]
+        public async Task Validation_RequiredAttribute_OnPOCOPropertyOfBoundElement_NoDataForRequiredProperty()
+        {
+            // Arrange
+            var argumentBinder = ModelBindingTestHelper.GetArgumentBinder();
+            var parameter = new ParameterDescriptor()
+            {
+                Name = "parameter",
+                ParameterType = typeof(List<Order5>)
+            };
+
+            var operationContext = ModelBindingTestHelper.GetOperationBindingContext(request =>
+            {
+                // Force creation of the Customer model.
+                request.QueryString = new QueryString("?parameter[0].Name=bill");
+            });
+
+            var modelState = new ModelStateDictionary();
+
+            // Act
+            var modelBindingResult = await argumentBinder.BindModelAsync(parameter, modelState, operationContext);
+
+            // Assert
+            Assert.NotNull(modelBindingResult);
+            Assert.True(modelBindingResult.IsModelSet);
+
+            var model = Assert.IsType<List<Order5>>(modelBindingResult.Model);
+            var item = Assert.Single(model);
+            Assert.Null(item.ProductId);
+            Assert.Equal("bill", item.Name);
+
+            Assert.Equal(2, modelState.Count);
+            Assert.Equal(1, modelState.ErrorCount);
+            Assert.False(modelState.IsValid);
+
+            var entry = Assert.Single(modelState, e => e.Key == "parameter[0].ProductId").Value;
+            Assert.Null(entry.Value);
+            Assert.Equal(ModelValidationState.Invalid, entry.ValidationState);
+
+            var error = Assert.Single(entry.Errors);
+            AssertRequiredError("ProductId", error);
+        }
+
+        private static void AssertRequiredError(string key, ModelError error)
+        {
+            Assert.Equal(string.Format("The {0} field is required.", key), error.ErrorMessage);
+            Assert.Null(error.Exception);
+        }
+    }
+}