add NullableInt test

Author: campersau

src/Mvc/Mvc.Core/test/ModelBinding/Binders/CollectionModelBinderTest.cs

@@ -215,7 +215,7 @@ public async Task BindSimpleCollection_RawValueWithNull_ReturnsListWithoutNull()
                 { "someName", "420" },
             };
         var context = GetModelBindingContext(valueProvider);
-        var valueProviderResult = new ValueProviderResult(new[] { null, "42", "100", null, "200" });
+        var valueProviderResult = new ValueProviderResult(new[] { null, "42", "", "100", null, "200" });
 
         // Act
         var boundCollection = await binder.BindSimpleCollection(context, valueProviderResult);

src/Mvc/test/Mvc.FunctionalTests/CustomValueProviderTest.cs

@@ -57,6 +57,23 @@ public async Task CustomValueProvider_IntValues()
         Assert.Equal("[42,100,200]", content);
     }
 
+    [Fact]
+    public async Task CustomValueProvider_NullableIntValues()
+    {
+        // Arrange
+        var url = "http://localhost/CustomValueProvider/CustomValueProviderNullableIntValues";
+        var request = new HttpRequestMessage(HttpMethod.Get, url);
+
+        // Act
+        var response = await Client.SendAsync(request);
+        var content = await response.Content.ReadAsStringAsync();
+
+        // Assert
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        Assert.Equal("application/json", response.Content.Headers.ContentType.MediaType);
+        Assert.Equal("[null,42,null,100,null,200]", content);
+    }
+
     [Fact]
     public async Task CustomValueProvider_StringValues()
     {

src/Mvc/test/WebSites/BasicWebSite/Controllers/CustomValueProviderController.cs

@@ -16,6 +16,10 @@ public string CustomValueProviderDisplayName(string customValueProviderDisplayNa
     public int[] CustomValueProviderIntValues(int[] customValueProviderIntValues)
         => customValueProviderIntValues;
 
+    [HttpGet]
+    public int?[] CustomValueProviderNullableIntValues(int?[] customValueProviderNullableIntValues)
+        => customValueProviderNullableIntValues;
+
     [HttpGet]
     public string[] CustomValueProviderStringValues(string[] customValueProviderStringValues)
         => customValueProviderStringValues;

src/Mvc/test/WebSites/BasicWebSite/ValueProviders/CustomValueProviderFactory.cs

@@ -20,6 +20,7 @@ private class CustomValueProvider : IValueProvider
         {
             { "customValueProviderDisplayName", context => context.ActionContext.ActionDescriptor.DisplayName },
             { "customValueProviderIntValues", _ => new []{ null, "42", "100", null, "200" } },
+            { "customValueProviderNullableIntValues", _ => new []{ null, "42", "", "100", null, "200" } },
             { "customValueProviderStringValues", _ => new []{ null, "foo", "", "bar", null, "baz" } },
         };