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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Linq.Expressions;
using Microsoft.Web.UnitTestUtil;
using Moq;
using Xunit;
using Assert = Microsoft.TestCommon.AssertEx;
namespace System.Web.Mvc.Html.Test
{
public class DisplayNameExtensionsTest
{
[Fact]
public void DisplayNameNullExpressionThrows()
{
// Act & Assert
Assert.ThrowsArgumentNull(
() => MvcHelper.GetHtmlHelper().Display(null),
"expression");
}
[Fact]
public void DisplayNameWithNoModelMetadataDisplayNameOverride()
{
// Act
MvcHtmlString result = MvcHelper.GetHtmlHelper().DisplayNameInternal("PropertyName", new MetadataHelper().MetadataProvider.Object);
// Assert
Assert.Equal("PropertyName", result.ToHtmlString());
}
[Fact]
public void DisplayNameUsesMetadataForDisplayText()
{
// Arrange
MetadataHelper metadataHelper = new MetadataHelper();
metadataHelper.Metadata.Setup(m => m.DisplayName).Returns("Custom display name from metadata");
// Act
MvcHtmlString result = MvcHelper.GetHtmlHelper().DisplayNameInternal("PropertyName", metadataHelper.MetadataProvider.Object);
// Assert
Assert.Equal("Custom display name from metadata", result.ToHtmlString());
}
private sealed class Model
{
public string PropertyName { get; set; }
}
[Fact]
public void DisplayNameConsultsMetadataProviderForMetadataAboutProperty()
{
// Arrange
Model model = new Model { PropertyName = "propertyValue" };
ViewDataDictionary viewData = new ViewDataDictionary();
Mock<ViewContext> viewContext = new Mock<ViewContext>();
viewContext.Setup(c => c.ViewData).Returns(viewData);
Mock<IViewDataContainer> viewDataContainer = new Mock<IViewDataContainer>();
viewDataContainer.Setup(c => c.ViewData).Returns(viewData);
HtmlHelper<Model> html = new HtmlHelper<Model>(viewContext.Object, viewDataContainer.Object);
viewData.Model = model;
MetadataHelper metadataHelper = new MetadataHelper();
metadataHelper.MetadataProvider.Setup(p => p.GetMetadataForProperty(It.IsAny<Func<object>>(), typeof(Model), "PropertyName"))
.Returns(metadataHelper.Metadata.Object)
.Verifiable();
// Act
html.DisplayNameInternal("PropertyName", metadataHelper.MetadataProvider.Object);
// Assert
metadataHelper.MetadataProvider.Verify();
}
[Fact]
public void DisplayNameUsesMetadataForPropertyName()
{
// Arrange
MetadataHelper metadataHelper = new MetadataHelper();
metadataHelper.Metadata = new Mock<ModelMetadata>(metadataHelper.MetadataProvider.Object, null, null, typeof(object), "Custom property name from metadata");
metadataHelper.MetadataProvider.Setup(p => p.GetMetadataForType(It.IsAny<Func<object>>(), It.IsAny<Type>()))
.Returns(metadataHelper.Metadata.Object);
// Act
MvcHtmlString result = MvcHelper.GetHtmlHelper().DisplayNameInternal("PropertyName", metadataHelper.MetadataProvider.Object);
// Assert
Assert.Equal("Custom property name from metadata", result.ToHtmlString());
}
[Fact]
public void DisplayNameForNullExpressionThrows()
{
// Act & Assert
Assert.ThrowsArgumentNull(
() => MvcHelper.GetHtmlHelper().DisplayNameFor((Expression<Func<Object, Object>>)null),
"expression");
Assert.ThrowsArgumentNull(
() => GetEnumerableHtmlHelper().DisplayNameFor((Expression<Func<Foo, Object>>)null),
"expression");
}
[Fact]
public void DisplayNameForNonMemberExpressionThrows()
{
// Act & Assert
Assert.Throws<InvalidOperationException>(
() => MvcHelper.GetHtmlHelper().DisplayNameFor(model => new { foo = "Bar" }),
"Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions.");
Assert.Throws<InvalidOperationException>(
() => GetEnumerableHtmlHelper().DisplayNameFor((Expression<Func<IEnumerable<Foo>, object>>)(model => new { foo = "Bar" })),
"Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions.");
}
[Fact]
public void DisplayNameForWithNoModelMetadataDisplayNameOverride()
{
// Arrange
string unknownKey = "this is a dummy parameter value";
// Act
MvcHtmlString result = MvcHelper.GetHtmlHelper().DisplayNameFor(model => unknownKey);
MvcHtmlString enumerableResult = GetEnumerableHtmlHelper().DisplayNameFor((Expression<Func<IEnumerable<Foo>, string>>)(model => unknownKey));
// Assert
Assert.Equal("unknownKey", result.ToHtmlString());
Assert.Equal("unknownKey", enumerableResult.ToHtmlString());
}
[Fact]
public void DisplayNameForUsesModelMetadata()
{
// Arrange
MetadataHelper metadataHelper = new MetadataHelper();
metadataHelper.Metadata.Setup(m => m.DisplayName).Returns("Custom display name from metadata");
string unknownKey = "this is a dummy parameter value";
// Act
MvcHtmlString result = MvcHelper.GetHtmlHelper().DisplayNameForInternal(model => unknownKey, metadataHelper.MetadataProvider.Object);
MvcHtmlString enumerableResult = GetEnumerableHtmlHelper().DisplayNameForInternal(model => model.Bar, metadataHelper.MetadataProvider.Object);
// Assert
Assert.Equal("Custom display name from metadata", result.ToHtmlString());
Assert.Equal("Custom display name from metadata", enumerableResult.ToHtmlString());
}
[Fact]
public void DisplayNameForEmptyDisplayNameReturnsEmptyName()
{
// Arrange
MetadataHelper metadataHelper = new MetadataHelper();
metadataHelper.Metadata.Setup(m => m.DisplayName).Returns(String.Empty);
string unknownKey = "this is a dummy parameter value";
// Act
MvcHtmlString result = MvcHelper.GetHtmlHelper().DisplayNameForInternal(model => unknownKey, metadataHelper.MetadataProvider.Object);
MvcHtmlString enumerableResult = GetEnumerableHtmlHelper().DisplayNameForInternal(model => model.Bar, metadataHelper.MetadataProvider.Object);
// Assert
Assert.Equal(String.Empty, result.ToHtmlString());
Assert.Equal(String.Empty, enumerableResult.ToHtmlString());
}
[Fact]
public void DisplayNameForModelUsesModelMetadata()
{
// Arrange
ViewDataDictionary viewData = new ViewDataDictionary();
Mock<ModelMetadata> metadata = new MetadataHelper().Metadata;
metadata.Setup(m => m.DisplayName).Returns("Custom display name from metadata");
viewData.ModelMetadata = metadata.Object;
viewData.TemplateInfo.HtmlFieldPrefix = "Prefix";
// Act
MvcHtmlString result = MvcHelper.GetHtmlHelper(viewData).DisplayNameForModel();
// Assert
Assert.Equal("Custom display name from metadata", result.ToHtmlString());
}
[Fact]
public void DisplayNameForWithNestedClass()
{
// Arrange
ViewDataDictionary viewData = new ViewDataDictionary();
Mock<ViewContext> viewContext = new Mock<ViewContext>();
viewContext.Setup(c => c.ViewData).Returns(viewData);
Mock<IViewDataContainer> viewDataContainer = new Mock<IViewDataContainer>();
viewDataContainer.Setup(c => c.ViewData).Returns(viewData);
HtmlHelper<NestedProduct> html = new HtmlHelper<NestedProduct>(viewContext.Object, viewDataContainer.Object);
// Act
MvcHtmlString result = html.DisplayNameForInternal(nested => nested.product.Id, new MetadataHelper().MetadataProvider.Object);
//Assert
Assert.Equal("Id", result.ToHtmlString());
}
private class Product
{
public int Id { get; set; }
}
private class Cart
{
public Product[] Products { get; set; }
}
private class NestedProduct
{
public Product product = new Product();
}
private sealed class Foo
{
public string Bar { get; set; }
}
private static HtmlHelper<IEnumerable<Foo>> GetEnumerableHtmlHelper()
{
return MvcHelper.GetHtmlHelper(new ViewDataDictionary<IEnumerable<Foo>>());
}
private sealed class MetadataHelper
{
public Mock<ModelMetadata> Metadata { get; set; }
public Mock<ModelMetadataProvider> MetadataProvider { get; set; }
public MetadataHelper()
{
MetadataProvider = new Mock<ModelMetadataProvider>();
Metadata = new Mock<ModelMetadata>(MetadataProvider.Object, null, null, typeof(object), null);
MetadataProvider.Setup(p => p.GetMetadataForProperties(It.IsAny<object>(), It.IsAny<Type>()))
.Returns(new ModelMetadata[0]);
MetadataProvider.Setup(p => p.GetMetadataForProperty(It.IsAny<Func<object>>(), It.IsAny<Type>(), It.IsAny<string>()))
.Returns(Metadata.Object);
MetadataProvider.Setup(p => p.GetMetadataForType(It.IsAny<Func<object>>(), It.IsAny<Type>()))
.Returns(Metadata.Object);
}
}
}
}
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