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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 Moq;
using Xunit;
using Assert = Microsoft.TestCommon.AssertEx;
namespace System.Web.Mvc.Test
{
public class ModelBinderProviderCollectionTest
{
[Fact]
public void GuardClause()
{
// Arrange
var collection = new ModelBinderProviderCollection();
// Act & Assert
Assert.ThrowsArgumentNull(
() => collection.GetBinder(null),
"modelType"
);
}
[Fact]
public void GetBinderUsesRegisteredProviders()
{
// Arrange
var testType = typeof(string);
var expectedBinder = new Mock<IModelBinder>().Object;
var provider = new Mock<IModelBinderProvider>(MockBehavior.Strict);
provider.Setup(p => p.GetBinder(testType)).Returns(expectedBinder);
var collection = new ModelBinderProviderCollection(new[] { provider.Object });
// Act
IModelBinder returnedBinder = collection.GetBinder(testType);
// Assert
Assert.Same(expectedBinder, returnedBinder);
}
[Fact]
public void GetBinderReturnsValueFromFirstSuccessfulBinderProvider()
{
// Arrange
var testType = typeof(string);
IModelBinder nullModelBinder = null;
IModelBinder expectedBinder = new Mock<IModelBinder>().Object;
IModelBinder secondMatchingBinder = new Mock<IModelBinder>().Object;
var provider1 = new Mock<IModelBinderProvider>();
provider1.Setup(p => p.GetBinder(testType)).Returns(nullModelBinder);
var provider2 = new Mock<IModelBinderProvider>(MockBehavior.Strict);
provider2.Setup(p => p.GetBinder(testType)).Returns(expectedBinder);
var provider3 = new Mock<IModelBinderProvider>(MockBehavior.Strict);
provider3.Setup(p => p.GetBinder(testType)).Returns(secondMatchingBinder);
var collection = new ModelBinderProviderCollection(new[] { provider1.Object, provider2.Object, provider3.Object });
// Act
IModelBinder returnedBinder = collection.GetBinder(testType);
// Assert
Assert.Same(expectedBinder, returnedBinder);
}
[Fact]
public void GetBinderReturnsNullWhenNoSuccessfulBinderProviders()
{
// Arrange
var testType = typeof(string);
IModelBinder nullModelBinder = null;
var provider1 = new Mock<IModelBinderProvider>();
provider1.Setup(p => p.GetBinder(testType)).Returns(nullModelBinder);
var provider2 = new Mock<IModelBinderProvider>(MockBehavior.Strict);
provider2.Setup(p => p.GetBinder(testType)).Returns(nullModelBinder);
var collection = new ModelBinderProviderCollection(new[] { provider1.Object, provider2.Object });
// Act
IModelBinder returnedBinder = collection.GetBinder(testType);
// Assert
Assert.Null(returnedBinder);
}
[Fact]
public void GetBinderDelegatesToResolver()
{
// Arrange
Type modelType = typeof(string);
IModelBinder expectedBinder = new Mock<IModelBinder>().Object;
Mock<IModelBinderProvider> locatedProvider = new Mock<IModelBinderProvider>();
locatedProvider.Setup(p => p.GetBinder(modelType))
.Returns(expectedBinder);
Mock<IModelBinderProvider> secondProvider = new Mock<IModelBinderProvider>();
Resolver<IEnumerable<IModelBinderProvider>> resolver = new Resolver<IEnumerable<IModelBinderProvider>> { Current = new IModelBinderProvider[] { locatedProvider.Object, secondProvider.Object } };
ModelBinderProviderCollection providers = new ModelBinderProviderCollection(resolver);
// Act
IModelBinder returnedBinder = providers.GetBinder(modelType);
// Assert
Assert.Same(expectedBinder, returnedBinder);
}
}
}
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