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