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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
namespace System.Data.Entity.Config
{
using System.Collections.Concurrent;
using System.Data.Entity.Utilities;
using System.Linq;
using Moq;
using Xunit;
public class ResolverChainTests : TestBase
{
public interface IPilkington
{
}
public class Karl : IPilkington
{
}
[Fact]
public void GetService_returns_null_for_empty_chain()
{
Assert.Null(new ResolverChain().GetService<IPilkington>());
}
[Fact]
public void GetService_returns_null_if_no_resolver_in_the_chain_resolves_the_dependency()
{
var mockResolver1 = CreateMockResolver("Steve", new Mock<IPilkington>().Object);
var mockResolver2 = CreateMockResolver("Ricky", new Mock<IPilkington>().Object);
var chain = new ResolverChain();
chain.Add(mockResolver1.Object);
chain.Add(mockResolver2.Object);
Assert.Null(chain.GetService<IPilkington>("Karl"));
mockResolver1.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Once());
mockResolver2.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Once());
}
[Fact]
public void GetService_returns_the_service_returned_by_the_most_recently_added_resolver_that_resolves_the_dependency()
{
var karl = new Mock<IPilkington>().Object;
var mockResolver1 = CreateMockResolver("Karl", new Mock<IPilkington>().Object);
var mockResolver2 = CreateMockResolver("Karl", karl);
var mockResolver3 = CreateMockResolver("Ricky", new Mock<IPilkington>().Object);
var chain = new ResolverChain();
chain.Add(mockResolver1.Object);
chain.Add(mockResolver2.Object);
chain.Add(mockResolver3.Object);
Assert.Same(karl, chain.GetService<IPilkington>("Karl"));
mockResolver1.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Never());
mockResolver2.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Once());
mockResolver3.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Once());
}
private static Mock<IDbDependencyResolver> CreateMockResolver<T>(string name, T service)
{
var mockResolver = new Mock<IDbDependencyResolver>();
mockResolver.Setup(m => m.GetService(typeof(T), name)).Returns(service);
return mockResolver;
}
/// <summary>
/// This test makes calls from multiple threads such that we have at least some chance of finding threading
/// issues. As with any test of this type just because the test passes does not mean that the code is
/// correct. On the other hand if this test ever fails (EVEN ONCE) then we know there is a problem to
/// be investigated. DON'T just re-run and think things are okay if the test then passes.
/// </summary>
[Fact]
public void GetService_and_Add_can_be_accessed_from_multiple_threads_concurrently()
{
for (var i = 0; i < 30; i++)
{
var bag = new ConcurrentBag<IPilkington>();
var resolver = new ResolverChain();
var karl = new Karl();
ExecuteInParallel(
() =>
{
resolver.Add(new SingletonDependencyResolver<IPilkington>(karl, "Karl"));
bag.Add(resolver.GetService<IPilkington>("Karl"));
});
Assert.Equal(20, bag.Count);
Assert.True(bag.All(c => karl == c));
}
}
[Fact]
public void Resolvers_property_returns_resolvers_in_same_order_that_they_were_added()
{
var resolvers = new[]
{
new Mock<IDbDependencyResolver>().Object,
new Mock<IDbDependencyResolver>().Object,
new Mock<IDbDependencyResolver>().Object,
};
var chain = new ResolverChain();
resolvers.Each(chain.Add);
Assert.Equal(resolvers, chain.Resolvers);
}
}
}
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