92 lines
3.8 KiB
C#
92 lines
3.8 KiB
C#
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// 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.Linq;
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using Moq;
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using Xunit;
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public class SingletonDependencyResolverTests : TestBase
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{
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[Fact]
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public void Constructors_throw_for_null_instance()
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{
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Assert.Equal(
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"singletonInstance",
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Assert.Throws<ArgumentNullException>(() => new SingletonDependencyResolver<object>(null)).ParamName);
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Assert.Equal(
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"singletonInstance",
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Assert.Throws<ArgumentNullException>(() => new SingletonDependencyResolver<object>(null, "Karl")).ParamName);
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}
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public interface IPilkington
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{
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}
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public interface IGervais
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{
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}
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[Fact]
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public void GetService_returns_unnamed_instance_of_contract_interface()
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{
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var instance = new Mock<IPilkington>().Object;
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Assert.Same(instance, new SingletonDependencyResolver<IPilkington>(instance).GetService<IPilkington>());
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Assert.Same(instance, new SingletonDependencyResolver<IPilkington>(instance, null).GetService<IPilkington>());
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}
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[Fact]
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public void GetService_returns_named_instance_of_contract_interface()
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{
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var instance = new Mock<IPilkington>().Object;
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Assert.Same(instance, new SingletonDependencyResolver<IPilkington>(instance, "Karl").GetService<IPilkington>("Karl"));
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}
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[Fact]
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public void GetService_returns_null_when_contract_interface_does_not_match()
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{
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var instance = new Mock<IPilkington>().Object;
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Assert.Null(new SingletonDependencyResolver<IPilkington>(instance).GetService<IGervais>());
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Assert.Null(new SingletonDependencyResolver<IPilkington>(instance, null).GetService<IGervais>());
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Assert.Null(new SingletonDependencyResolver<IPilkington>(instance, "Karl").GetService<IGervais>("Karl"));
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}
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[Fact]
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public void GetService_returns_null_when_name_does_not_match()
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{
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var instance = new Mock<IPilkington>().Object;
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Assert.Null(new SingletonDependencyResolver<IPilkington>(instance, "Karl").GetService<IPilkington>("Ricky"));
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Assert.Null(new SingletonDependencyResolver<IPilkington>(instance, "Karl").GetService<IPilkington>());
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Assert.Null(new SingletonDependencyResolver<IPilkington>(instance, "Karl").GetService<IGervais>("Ricky"));
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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_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 karl = new Mock<IPilkington>().Object;
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var resolver = new SingletonDependencyResolver<IPilkington>(karl, "Karl");
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ExecuteInParallel(() => bag.Add(resolver.GetService<IPilkington>("Karl")));
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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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}
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}
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