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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 DependencyResolverTest
{
[Fact]
public void GuardClauses()
{
// Arrange
var resolver = new DependencyResolver();
// Act & Assert
Assert.ThrowsArgumentNull(
() => resolver.InnerSetResolver((IDependencyResolver)null),
"resolver"
);
Assert.ThrowsArgumentNull(
() => resolver.InnerSetResolver((object)null),
"commonServiceLocator"
);
Assert.ThrowsArgumentNull(
() => resolver.InnerSetResolver(null, type => null),
"getService"
);
Assert.ThrowsArgumentNull(
() => resolver.InnerSetResolver(type => null, null),
"getServices"
);
}
[Fact]
public void DefaultServiceLocatorBehaviorTests()
{
// Arrange
var resolver = new DependencyResolver();
// Act & Assert
Assert.NotNull(resolver.InnerCurrent.GetService<object>()); // Concrete type
Assert.Null(resolver.InnerCurrent.GetService<ModelMetadataProvider>()); // Abstract type
Assert.Null(resolver.InnerCurrent.GetService<IDisposable>()); // Interface
Assert.Null(resolver.InnerCurrent.GetService(typeof(List<>))); // Open generic
}
[Fact]
public void DefaultServiceLocatorResolvesNewInstances()
{
// Arrange
var resolver = new DependencyResolver();
// Act
object obj1 = resolver.InnerCurrent.GetService<object>();
object obj2 = resolver.InnerCurrent.GetService<object>();
// Assert
Assert.NotSame(obj1, obj2);
}
public class MockableResolver
{
public virtual object Get(Type type)
{
throw new NotImplementedException();
}
public virtual IEnumerable<object> GetAll(Type type)
{
throw new NotImplementedException();
}
}
[Fact]
public void ResolverPassesCallsToDelegateBasedResolver()
{
// Arrange
var resolver = new DependencyResolver();
var mockResolver = new Mock<MockableResolver>();
resolver.InnerSetResolver(mockResolver.Object.Get, mockResolver.Object.GetAll);
// Act & Assert
resolver.InnerCurrent.GetService(typeof(object));
mockResolver.Verify(r => r.Get(typeof(object)));
resolver.InnerCurrent.GetServices(typeof(string));
mockResolver.Verify(r => r.GetAll(typeof(string)));
}
public class MockableCommonServiceLocator
{
public virtual object GetInstance(Type type)
{
throw new NotImplementedException();
}
public virtual IEnumerable<object> GetAllInstances(Type type)
{
throw new NotImplementedException();
}
}
[Fact]
public void ResolverPassesCallsToICommonServiceLocator()
{
// Arrange
var resolver = new DependencyResolver();
var mockResolver = new Mock<MockableCommonServiceLocator>();
resolver.InnerSetResolver(mockResolver.Object);
// Act & Assert
resolver.InnerCurrent.GetService(typeof(object));
mockResolver.Verify(r => r.GetInstance(typeof(object)));
resolver.InnerCurrent.GetServices(typeof(string));
mockResolver.Verify(r => r.GetAllInstances(typeof(string)));
}
class MissingGetInstance
{
public IEnumerable<object> GetAllInstances(Type type)
{
return null;
}
}
class MissingGetAllInstances
{
public object GetInstance(Type type)
{
return null;
}
}
class GetInstanceHasWrongSignature
{
public string GetInstance(Type type)
{
return null;
}
public IEnumerable<object> GetAllInstances(Type type)
{
return null;
}
}
class GetAllInstancesHasWrongSignature
{
public object GetInstance(Type type)
{
return null;
}
public IEnumerable<string> GetAllInstances(Type type)
{
return null;
}
}
[Fact]
public void ValidationOfCommonServiceLocatorTests()
{
// Arrange
var resolver = new DependencyResolver();
// Act & Assert
Assert.Throws<ArgumentException>(
() => resolver.InnerSetResolver(new MissingGetInstance()),
@"The type System.Web.Mvc.Test.DependencyResolverTest+MissingGetInstance does not appear to implement Microsoft.Practices.ServiceLocation.IServiceLocator.
Parameter name: commonServiceLocator"
);
Assert.Throws<ArgumentException>(
() => resolver.InnerSetResolver(new MissingGetAllInstances()),
@"The type System.Web.Mvc.Test.DependencyResolverTest+MissingGetAllInstances does not appear to implement Microsoft.Practices.ServiceLocation.IServiceLocator.
Parameter name: commonServiceLocator"
);
Assert.Throws<ArgumentException>(
() => resolver.InnerSetResolver(new GetInstanceHasWrongSignature()),
@"The type System.Web.Mvc.Test.DependencyResolverTest+GetInstanceHasWrongSignature does not appear to implement Microsoft.Practices.ServiceLocation.IServiceLocator.
Parameter name: commonServiceLocator"
);
Assert.Throws<ArgumentException>(
() => resolver.InnerSetResolver(new GetAllInstancesHasWrongSignature()),
@"The type System.Web.Mvc.Test.DependencyResolverTest+GetAllInstancesHasWrongSignature does not appear to implement Microsoft.Practices.ServiceLocation.IServiceLocator.
Parameter name: commonServiceLocator"
);
}
[Fact]
public void DependencyResolverCache()
{
// Verify that when we ask for an interface twice, it only queries the underlying resolver once.
var resolver = new DependencyResolver();
Mock<IDependencyResolver> resolverMock = new Mock<IDependencyResolver>();
resolverMock.Setup(r => r.GetService(typeof(object))).Returns(() => new object());
resolverMock.Setup(r => r.GetService(typeof(int))).Returns(15);
resolver.InnerSetResolver(resolverMock.Object);
object result1 = resolver.InnerCurrentCache.GetService(typeof(object)); // 1st call
object otherResult = resolver.InnerCurrentCache.GetService(typeof(int)); // 2nd call
object result2 = resolver.InnerCurrentCache.GetService(typeof(object)); // Cached result from 1st call
resolverMock.Verify(r => r.GetService(typeof(object)), Times.Once());
resolverMock.Verify(r => r.GetService(typeof(int)), Times.Once());
Assert.Same(result1, result2);
Assert.Equal(15, otherResult);
}
[Fact]
public void ClearDependencyResolverCache()
{
// Verify that when we ask for an interface twice, it only queries the underlying resolver once.
var resolver = new DependencyResolver();
Mock<IDependencyResolver> resolverMock = new Mock<IDependencyResolver>();
resolverMock.Setup(r => r.GetService(typeof(object))).Returns(() => new object());
resolverMock.Setup(r => r.GetService(typeof(int))).Returns(15);
resolver.InnerSetResolver(resolverMock.Object);
object result1 = resolver.InnerCurrentCache.GetService(typeof(object)); // 1st call
object otherResult = resolver.InnerCurrentCache.GetService(typeof(int)); // 2nd call
resolver.InnerSetResolver(resolverMock.Object); // This will clear the cache
object result2 = resolver.InnerCurrentCache.GetService(typeof(object)); // 3rd call
resolverMock.Verify(r => r.GetService(typeof(object)), Times.Exactly(2));
resolverMock.Verify(r => r.GetService(typeof(int)), Times.Once());
Assert.NotSame(result1, result2);
Assert.Equal(15, otherResult);
}
}
}
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